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Mobile App Development Company: Custom App Creation Services

Updated September 2026 · Written and maintained by the Progression Agency strategy team

Progression Agency is a New York City app development company building iOS, Android and cross-platform apps for businesses across the United States. We plan, design, build, launch and maintain mobile apps and the backends behind them — and because we are also a marketing agency, we build the launch plan that gets an app installed alongside the app itself. This page explains what our mobile app development services cover, how a project runs from first call to store release, what drives cost and timeline, and how to compare any app development company you are considering.

On this page · 20 sections
  1. What does an app development company do?
  2. Our mobile app development services
  3. Native vs cross-platform: which should you build?
  4. How our app development process works
  5. How long does it take to build an app?
  6. How much does app development cost?
  7. Why choose Progression Agency as your app development company?
  8. How to choose an app development company
  9. App development in New York and across the US
  10. Related software development services
  11. Apps we build for every industry
  12. Mobile app creation services for companies
  13. Apps we build by platform and type
  14. iOS or Android first: how do you decide?
  15. What to include in an app development brief
  16. App security and privacy by design
  17. Launching your app: store optimization and first users
  18. What happens after your app launches?
  19. App development for startups and for established businesses
  20. App development companies in the USA: how to choose one

The short answerA mobile app development company turns a product idea into a working app in the Apple App Store and Google Play: discovery and scoping, UX and interface design, front-end and backend engineering, testing, store submission and ongoing maintenance. The decisions that matter most are made before any code — which platforms first, native or cross-platform, what the first release must do, and how the backend will scale. Progression Agency runs that whole sequence with one team, and adds the part most development shops leave out: a launch and acquisition plan so the finished app actually gets users.

Cost and timeline figures on this page are typical US-market ranges stated for planning, not quotes; every project is priced from its own scope. Platform fees and policies are taken from Apple’s and Google’s published developer documentation as of September 2026 and change regularly. We do not publish client results or name clients without their permission.

What our app development service coversWhat our app development service covers
Five stages, one accountable team. The final stage is where an app development company that is also a marketing agency earns its place: an app with no acquisition plan launches to nobody.

What does an app development company do?

An app development company designs, engineers, tests, publishes and maintains mobile applications for iPhone, iPad and Android devices, usually together with the backend services and admin tools that make the app work. A full-service firm also handles discovery before the build and store optimization and user acquisition after it.

In practice that means a cross-functional team: a product lead who turns business goals into a feature list, UX and interface designers, mobile engineers for iOS and Android or a cross-platform framework, backend engineers for accounts, data and integrations, and QA specialists who test on real devices. Progression Agency puts all of those roles under one engagement so you have a single accountable partner rather than a chain of freelancers.

iOS — Native iOS apps. Swift and SwiftUI for iPhone and iPad..
Android — Native Android apps. Kotlin and Jetpack Compose..
Both — Cross-platform apps. React Native or Flutter, one codebase..
Web — Progressive web apps. Installable, fast, no store required..
API — Backends and APIs. Accounts, data, sync, admin panels..
AI — AI features. Assistants, search, recommendations..

Our mobile app development services

Native iOS app development

We build iPhone and iPad apps in Swift and SwiftUI following Apple’s Human Interface Guidelines, so the app feels at home on the platform and passes App Store review cleanly. Native iOS is the right call when an app depends on deep hardware access — camera pipelines, HealthKit, Apple Pay, widgets, Live Activities — or when your audience is overwhelmingly on iPhone, which is common for US consumer products.

Native Android app development

Our Android work uses Kotlin and Jetpack Compose and is tested across the range of screen sizes and manufacturers Android users actually carry. Android matters most for field and logistics apps running on rugged devices, for products aimed at international markets, and for any business whose customer base skews toward Android.

Cross-platform app development

For most business apps we recommend a cross-platform build in React Native or Flutter: one codebase, both stores, near-native performance and a materially lower cost to build and maintain. Our detailed comparison of the two frameworks lives on the cross-platform app development page.

Backend, API and admin development

The backend is frequently the larger half of an app: user accounts and authentication, databases, file storage, payments, notifications, third-party integrations and the admin panel your team uses to run things. We scope it as its own line item so it is never a surprise, and we build it on managed cloud infrastructure that scales with usage.

AI features inside your app

Assistants, natural-language search, document and image understanding, recommendations and automated support are now practical to build into business apps. Our AI app development service covers model selection, retrieval over your own data, cost control and the guardrails that keep answers on-brand.

App UX and UI design

Design is where adoption is won. We map the flows users will actually take, design the interface to each platform’s conventions and hand you a clickable prototype to put in front of real users before a line of production code is written.

App maintenance and support

Apple and Google ship major operating-system releases every year and periodically raise the minimum build targets the stores accept, so every live app needs ongoing care even if its features never change. Our maintenance plans cover OS compatibility, dependency and security updates, crash monitoring, bug fixes with agreed response times and small feature work.

App launch, store optimization and marketing

This is the service that separates us from a pure development shop. We set up analytics and attribution before launch, write and test store listings for App Store and Google Play search, and run the paid social and search campaigns that drive installs. See our mobile app PR and performance marketing services for the growth side.

Native, cross-platform and web app approaches compared
Cross-platform is the default recommendation for most business apps in 2026: near-native performance, one codebase and a faster route to both stores. Native wins when an app leans hard on device hardware or platform-specific features.

Native vs cross-platform: which should you build?

Choose cross-platform for most business, commerce and content apps because one codebase reaches both stores faster and for less. Choose native when the app’s core value depends on platform-specific hardware, graphics performance or features that cross-platform frameworks reach only through extra native modules.

Choosing an approach for your app
ApproachBest forTrade-off
Native iOS (Swift)iPhone-first consumer apps, deep Apple integrationsSeparate Android build needed later
Native Android (Kotlin)Field devices, Android-heavy audiencesSeparate iOS build needed later
React NativeBusiness and commerce apps; teams with web/JavaScript skillsSome features need native modules
FlutterDesign-heavy apps wanting pixel-identical UI on both platformsLarger app size; Dart skills
Progressive web appContent, booking and tools without store distributionLimited device access, weaker on iOS
How an app project runs with Progression Agency
Every sprint ends with a build you can install. You never wait months to see progress, and changes in direction cost days rather than a rebuild.

How our app development process works

Seven stages: discovery, scope and estimate, UX and interface design, sprint development, QA, store submission and launch-and-growth. Each sprint ends with a build you can install on your own phone, so progress is visible every two weeks.

1 — Discovery. The one job the app must do..
2 — Design. Flows and a prototype you can test..
3 — Build. Two-week sprints, working builds..
4 — Test. Real devices and OS versions..
5 — Launch. Store review handled for you..
6 — Grow. Analytics, ASO and acquisition..

Discovery: deciding what the first release must do

We start by identifying the single job the app must do exceptionally well for its first users, then the minimum set of features that job needs. Everything else goes on a roadmap. A tightly defined first release reaches the stores sooner, costs less and gives you real usage data to decide what comes next.

Sprints you can hold in your hand

Development runs in two-week sprints. At the end of each one you receive an installable build through TestFlight or a Google Play test track, plus a short written summary of what shipped and what is next. Direction changes are cheap when they happen early, and this rhythm makes sure they do.

Store submission without the surprises

Both stores review apps before publication. We prepare privacy disclosures, screenshots, review notes and test accounts in advance, and we handle any reviewer feedback. New personal Google Play developer accounts must now run a closed test with at least 12 testers opted in for 14 continuous days before production release, and we plan that window into the schedule.

A typical timeline for a two-platform business app
Design and development overlap deliberately. A focused first release can reach the stores considerably sooner; enterprise integrations and regulated data lengthen the build.

How long does it take to build an app?

A focused first release commonly takes three to four months; a moderately complex two-platform business app with a custom backend commonly takes five to seven months; enterprise apps with many integrations or regulated data can run longer. Scope, integrations and approval cycles drive the schedule far more than raw coding time.

Typical app timelines by complexity
App typeTypical first-release timelineWhat drives it
Focused MVP10-16 weeksOne core flow, simple backend
Business app, two platforms5-7 monthsAccounts, payments, admin, integrations
Marketplace or on-demand app6-9 monthsTwo or three user types, real-time features
Enterprise or regulated app8-12+ monthsSSO, security review, compliance, legacy systems

How much does app development cost?

As a planning range, a focused first release commonly lands between roughly $40,000 and $100,000, a full-featured two-platform business app between roughly $100,000 and $250,000, and complex marketplace or enterprise apps above that. Ongoing maintenance is commonly budgeted at around 15-20% of the build cost per year.

The biggest cost drivers are the number of platforms, the size of the backend, third-party integrations, the number of distinct user types, and whether the app handles regulated data. Store fees are small by comparison: the Apple Developer Program costs $99 per year and a Google Play developer account carries a one-time $25 registration fee. For the full breakdown, see how much it costs to build an app.

App development cost ranges (planning figures, US market)
ScopeTypical rangeNotes
Clickable prototype$8,000-$25,000Validates flows before build
Focused MVP, one or two platforms$40,000-$100,000Cross-platform keeps this lower
Full business app$100,000-$250,000Custom backend, admin, integrations
Marketplace / enterprise$250,000+Multiple user types, compliance, scale
Annual maintenance~15-20% of build per yearOS updates, fixes, monitoring
Retail — Ecommerce and loyalty apps. Catalog, checkout, rewards, push..
Health — Healthcare apps. Scheduling, telehealth, HIPAA-aware..
Services — Field service apps. Jobs, photos, signatures, offline..
SaaS — Mobile companions to SaaS. Your platform in customers' pockets..
Internal — Employee and ops apps. Workflows that replace paper..
Community — Membership and content apps. Events, content, messaging..

Planning an app?We design, build, launch and maintain iOS, Android and web apps, with a written scope before any code.

Get an app proposal

Why choose Progression Agency as your app development company?

  • One team from idea to installs. Strategy, design, engineering, launch and marketing under one engagement.
  • You own everything. Source code, repositories, developer accounts and signing credentials sit in your name from day one.
  • Fixed, written scope. A named first-release feature list and estimate before development begins.
  • Visible progress. An installable build every two weeks, with a written summary.
  • Launch built in. Analytics, store optimization and acquisition planned before release, not after.
  • New York based, nationwide. Headquartered in New York City and working with clients across all 50 states.

How to choose an app development company

Compare firms on ownership terms, how they scope the first release, how they handle the backend, what maintenance covers, how often you see working builds, and whether they have a plan for getting the app installed. Portfolios matter, but these six answers predict how the project will actually go.

Who owns the code and store accounts? — Ask. You should, from day one..
What is in the first release? — Ask. A named, short feature list..
How is the backend scoped? — Ask. As its own line, not an afterthought..
What does maintenance cover? — Ask. OS updates, fixes, response times..
How will people find the app? — Ask. A launch plan, not hope..
Can I install a build every sprint? — Ask. Progress you can hold..
Questions to ask any app development company
QuestionA strong answer
Who owns the code and store accounts?You do, in writing, from the start
What exactly is in the first release?A short, named feature list tied to one core job
How is the backend priced?As a separate, itemized line
How often will I see a working build?Every sprint, installable on my own device
What does maintenance include?OS updates, security patches, fixes with response times
How will users find the app?A launch and acquisition plan with a budget
How businesses search for app developers
Search demand for app development is large and commercial: people typing these phrases are shortlisting a supplier. The questions this page answers are the ones they ask during that shortlist.

App development in New York and across the US

Progression Agency is headquartered in New York City, and we meet NYC clients in person for discovery and design workshops. Most of our app clients are elsewhere in the United States, and the process runs just as well remotely. If you are specifically looking for a local partner, see our app development company NYC page.

Apps rarely live alone. Many of our app projects sit alongside custom software development, web application development, website design and development and AI automation. We plan them together so the data, accounts and branding line up across every surface your customers touch.

Apps we build for every industry

The table lists the app we are most often asked to build in each industry we serve. For the wider software picture in each industry see custom software development.

Typical app by industry
IndustryApp we most often build
RestaurantsOrdering, reservations and rewards app
HealthcarePatient booking and telehealth app
Pest ControlTechnician route and service-log app
LandscapingCrew scheduling and estimate-approval app
RoofingInspection and proposal app
ContractorsJob tracking and change-order app
Home BuildersBuyer selections and build-progress app
Kitchen & Bath RemodelingDesign selection and project timeline app
Auto DealersService booking and trade-in app
Real EstateListing search and client portal app
Medical PracticesAppointment and intake app
Med SpasMembership and treatment booking app
ChiropracticCare plan and home-exercise app
Plastic SurgeryVirtual consult and post-op app
AccountantsDocument collection client portal
Credit UnionsMember onboarding and loan application app
B2B SaaSMobile companion app for a SaaS platform
TechnologyCustomer dashboard and developer portal
CybersecurityAlert dashboard and customer security portal
Data CentersCapacity and remote-hands portal
CannabisOrder-ahead and loyalty app
JewelryCustom design and repair-tracking app
HotelsGuest experience and mobile check-in app
NonprofitsVolunteer and donor app
Restaurant GroupsMulti-location ordering and catering app
HVACDispatch and maintenance-plan app
SolarSite assessment and proposal app
Water Damage RestorationDrying log and insurance report app
Mold RemediationInspection and clearance documentation app
Spray Foam InsulationEstimating and job scheduling app
Home InspectionInspection report app
ManufacturingQuality inspection and dealer portal
PharmaceuticalField rep and HCP portal app
IT & Managed ServicesClient ticketing and reporting portal
StartupsMVP app
BeautyBooking and product recommendation app
Arts & CultureVisitor guide and membership app
Mobile App CompaniesFeature build and launch support
Life CoachesCoaching program and booking app

Mobile app creation services for companies

Progression Agency provides end-to-end mobile app creation services for companies: strategy, design, iOS and Android development, backend, launch and maintenance under one contract. App development for companies differs from consumer app work because it has to fit existing systems, brand standards, security reviews and internal approval chains.

As a US mobile app development company we work with businesses in every state from our New York City headquarters. Buyers comparing the top-rated mobile app development companies usually weigh the same five things: who owns the code, how the first release is scoped, whether the backend is priced separately, how often they will see working builds, and what happens after launch. We answer all five in writing before a project starts.

Apps we build by platform and type

Every platform and app type we build has its own page with costs, features and questions answered.

Custom mobile app development vs app builders

App builders and templates suit a simple brochure app. Custom mobile app development is the right call when the app needs its own data model, integrations, payments, offline use or a design that reflects your brand, and when you need to own the code outright.

What makes a mobile phone app development company the best fit

  • It scopes a focused first release instead of quoting everything at once.
  • It builds for both iPhone and Android, natively or cross-platform, and explains the choice.
  • It shows you an installable build every sprint.
  • It plans how the app will get users, not just how it will get built.
  • It puts repositories, developer accounts and signing credentials in your name.

iOS or Android first: how do you decide?

Lead with the platform your target users actually carry. Check your own website analytics for the split between iPhone and Android visitors; that number is usually a better guide than national market share. When the audience is split, a cross-platform build removes the decision.

Other signals point one way or the other: apps that monetize through subscriptions or in-app purchases in the US often lead on iOS, while apps for field crews, warehouses and international audiences often lead on Android because of device mix.

What to include in an app development brief

A good brief names the audience, the core job, the must-have features for the first release, the systems the app must connect to, the platforms, the budget range and the launch window. You do not need wireframes; a clear problem statement is more valuable.

A one-page app brief template
SectionWhat to write
AudienceWho uses the app and in what situation
Core jobThe one thing the app must do well
First-release featuresFive to ten must-haves; everything else goes to the roadmap
IntegrationsCRM, payments, booking, ERP, analytics
PlatformsiOS, Android, both, or web
Budget and timingA range and a target launch window
Success measureInstalls, activation, orders, bookings or time saved

App security and privacy by design

Security is designed in from the first sprint: secure authentication, encrypted storage and transport, least-privilege APIs, dependency scanning and privacy disclosures that match what the app actually collects. We follow the OWASP Mobile Application Security guidance.

Both stores require accurate privacy information: Apple’s App Privacy details and Google Play’s Data safety section. We prepare them from the real data flows so the listing is accurate at launch. Reference: OWASP Mobile Application Security.

Launching your app: store optimization and first users

A launch plan covers store listings optimized for search, screenshots and preview video, ratings prompts, analytics and attribution, and paid and organic campaigns that drive the first thousand active users.

  • Keyword research for the App Store and Google Play titles, subtitles and descriptions.
  • Screenshots and preview video designed to convert store visitors.
  • In-app ratings prompts timed after a success moment.
  • Attribution so every install is tied to its campaign.
  • Paid social and search campaigns aimed at qualified users.
  • Website landing pages and SEO so the app is found outside the stores.

What happens after your app launches?

The first weeks after launch are for watching real behavior: crash reports, where users drop out of onboarding, which features they use. We turn that into a prioritized roadmap and ship improvements in regular releases, alongside OS updates and maintenance.

App development for startups and for established businesses

Startups usually need a focused MVP that proves demand quickly; established businesses usually need an app that integrates with existing systems, brand and customer data. Our process adapts: leaner scoping for startups, deeper integration and governance for larger organizations.

How app projects differ by company stage
StartupEstablished business
Primary goalProve demandServe existing customers or staff better
First releaseSmallest viable productCore journeys plus integrations
Key riskBuilding the wrong thingIntegration and adoption
Typical approachCross-platform MVPCross-platform or native with SSO and APIs

Not sure which approach fits?Tell us what the app needs to do and we will recommend native, cross-platform or web, with the reasoning.

Talk it through

App development companies in the USA: how to choose one

Searches for app development companies in the USA return hundreds of firms, and most lists are paid placements. A US mobile app development company should show apps in both stores, name who will be on your team, put the first-release scope in writing and keep the code and store accounts in your name. Progression Agency is headquartered in New York City and works with businesses in every state; see our city pages for Dallas, Los Angeles, Chicago, Houston, Miami, Austin, Atlanta and San Diego.

What separates top rated mobile app development companies
SignalWhat to look for
Store presenceLive apps you can install and rate
TeamNamed product, design, iOS, Android, backend and QA people
ScopeA written first-release feature list before a price
CadenceAn installable build every two weeks
OwnershipCode, App Store and Google Play accounts in your name
After launchA maintenance plan and a growth plan

Custom mobile application development, design and the services around it

Custom mobile application development is only part of the job. We also provide UI/UX design services before the build, AR and VR features and Apple Watch and Wear OS apps where they change the product, and progressive web apps when a store listing is not needed.

Planning an app?

Tell us what you want the app to do and who it is for. We will come back with a recommended approach, a first-release scope and a planning estimate.

Get an app proposal

Software and app development

Frequently asked questions

What does an app development company do?
It designs, builds, tests, publishes and maintains mobile apps for iOS and Android, together with the backend services and admin tools behind them. A full-service firm like Progression Agency also handles discovery before the build and launch marketing after it.
How much does it cost to hire an app development company?
As a planning range, a focused first release commonly costs roughly $40,000-$100,000 and a full-featured two-platform business app roughly $100,000-$250,000, with complex marketplace or enterprise apps above that. Your scope sets the actual figure.
How long does it take to develop a mobile app?
A focused MVP commonly takes 10-16 weeks; a moderately complex two-platform business app five to seven months; enterprise or regulated apps longer. Integrations and approvals drive the schedule.
Should I build for iOS or Android first?
Build first for the platform most of your target users carry. US consumer apps often lead with iOS; field, logistics and international products often lead with Android. A cross-platform build lets you launch both at once.
Is cross-platform development as good as native?
For most business, commerce and content apps, yes: React Native and Flutter deliver near-native performance from one codebase. Native remains the better choice for heavy graphics, deep hardware access or platform-specific features.
Do you build the backend as well as the app?
Yes. Accounts, databases, payments, notifications, integrations and the admin panel are scoped as their own line item and built alongside the app.
Who owns the source code?
You do. Repositories, developer accounts and signing credentials are set up in your name from the first day of the project.
Do you publish the app to the App Store and Google Play?
Yes. We prepare store listings, privacy disclosures and review notes, submit the builds and handle any reviewer feedback.
What does Apple charge to publish an app?
The Apple Developer Program costs $99 per membership year. Apple’s App Store Small Business Program applies a 15% commission on paid apps and in-app purchases for qualifying developers with up to $1 million in prior-year proceeds.
What does Google charge to publish an app?
A Google Play developer account has a one-time $25 registration fee. Google’s service fees on digital sales vary by product type and region; check Google’s current fee page before modeling revenue.
Do new Google Play accounts have a testing requirement?
Yes. Personal developer accounts created after November 13, 2023 must run a closed test with at least 12 testers opted in for 14 continuous days before releasing to production.
What is an MVP in app development?
A minimum viable product: the smallest release that does the app’s core job well enough for real users. It reaches the stores sooner and produces the usage data that guides the next release.
Can you add AI features to an app?
Yes. We build assistants, natural-language search, document and image understanding and recommendations, with cost controls and guardrails appropriate to your data.
How much does app maintenance cost?
Ongoing maintenance is commonly budgeted at around 15-20% of the original build cost per year, covering OS updates, security patches, monitoring and fixes.
Why do apps need updates if nothing changes?
Apple and Google release major OS versions every year and periodically raise the minimum build targets their stores accept, so live apps need regular updates to stay compatible and listed.
Can you redesign or take over an existing app?
Yes. We start with a code and architecture review, then recommend whether to stabilize, refactor or rebuild, with the reasoning written down.
Do you sign an NDA?
Yes. We are happy to sign a mutual NDA before you share product details.
Do you work with startups?
Yes. For early-stage companies we usually recommend a focused MVP, often cross-platform, scoped to prove the core idea with real users as quickly as possible.
Are you based in New York?
Yes. Progression Agency is headquartered in New York City and works with clients across all 50 US states.
How do you help an app get users after launch?
We set up analytics and attribution, optimize store listings for App Store and Google Play search, and run paid social and search campaigns that drive qualified installs.
What is app store optimization?
The practice of improving an app’s title, subtitle, keywords, screenshots and ratings so it ranks and converts better in store search, the app-store equivalent of SEO.
Can you build an app that works offline?
Yes. Offline capture with background sync is common in our field-service and inspection apps, and we design the data model for it from the start.
What information do you need for an estimate?
Who the app is for, the main job it must do, the platforms you need, any systems it must connect to, and your target launch window. A rough sketch or competitor example helps.
Do you build progressive web apps?
Yes. When store distribution and deep device access are not required, a progressive web app can be the fastest, most economical way to deliver an app-like experience.
Which app development companies in the US should I consider?
Compare US mobile app development companies on live apps, named team, written scope, two-week builds and ownership of code and accounts; our city pages cover Dallas, Los Angeles, Chicago, Houston, Miami, Austin, Atlanta and San Diego.
What is a mobile app creation company?
An agency that takes an app from idea through design, engineering, store publishing and growth; the same thing as a mobile app development company.
Do you offer agency app development for other agencies?
Yes, as a white-label or partner team for marketing and design agencies.

Planning an app?We design, build, launch and maintain iOS, Android and web apps, with a written scope before any code.

Get an app proposal

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Tell us what you are trying to grow and we will come back with a plan, not a pitch deck. Same-day reply on weekdays.

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