An app is not finished when the code works. It is finished when it passes review on the Apple App Store and Google Play, installs cleanly on devices you have never touched, survives an operating system update, and can be patched within days when something breaks in the hands of real users. Choosing a mobile app company is mostly a question of whether the firm treats those later stages as part of the job. The listings on this page let you compare studios by market and by the platforms they actually ship on.
Neighbouring categories cover related needs: software companies for backend platforms, internal systems and the services an app connects to, and UX/UI design agencies when the interface and user research are the part you need help with rather than the engineering.
What a mobile app company handles
Scoping comes first, and it is more restrictive than on the web. Screen space is limited, permissions have to be justified to the user, and both stores enforce rules about what an app may do. A studio that starts by cutting your feature list rather than agreeing to all of it is doing the right thing.
Then the build, which usually spans three parts: the client application that runs on the handset, the server side services it talks to, and the tooling that gets releases out. Alongside it runs interface work adapted to each platform's conventions, because gestures, navigation patterns and system dialogs differ between iOS and Android and users notice when a screen ignores them.
Quality assurance covers more ground than most clients expect. Real devices with different screen sizes, older operating system versions, poor network conditions, interrupted sessions, permission denials and offline states all need checking. Emulators catch some of this. They do not catch battery drain, camera quirks or manufacturer specific behavior on Android handsets.
Finally, the store relationship: preparing listings, submitting binaries, responding to review rejections, staging rollouts, watching crash reports and shipping fixes. This continues for as long as the app exists.
Native, cross platform or web wrapper
The build path decides cost, timeline and which studios can bid, so settle it early.
- Native. Separate codebases per platform, written in each platform's own language. Best access to device capabilities, best performance, fastest adoption of new operating system features. Costs the most because two teams build two things.
- Cross platform frameworks. One shared codebase compiled or rendered to both platforms. Substantially cheaper to build and maintain, with tradeoffs around heavy graphics, deep hardware access and occasional lag behind new platform releases. The default choice for most business applications today.
- Web based wrappers. A responsive web application packaged for store distribution, or a progressive web app installed from the browser. Cheapest and fastest, adequate for content and forms, weak where offline behavior, push reliability or device sensors matter. Store reviewers also reject wrappers that add nothing beyond a website.
Ask each candidate to justify its recommendation against your specific feature list, particularly around offline use, background processing, camera or location precision, and any hardware integration. Those requirements, not preference, should decide the path.
Store accounts, submission and review
This is where inexperienced suppliers cost clients weeks. The developer accounts on both stores must belong to your company, with the studio invited as a team member. Apps published under an agency account are extremely awkward to reclaim later, and the store listing carries your reviews, your ratings and your install base.
Both stores review submissions before publication, and rejections are routine rather than exceptional. Common causes include unclear justification for requested permissions, missing privacy disclosures, account deletion requirements, payment rules for digital goods, incomplete demo credentials for reviewers and misleading listing screenshots. Ask a prospective studio how it handles rejections and how quickly it has turned them around, because the answer reveals whether it has shipped recently or is describing something it read.
Budget calendar time for review in your launch plan, keep a tester distribution channel running throughout the build, and prepare the listing assets early: icon, screenshots per device class, description, keywords, privacy labels and the support contact that the store requires.
Release management after launch
Web fixes go live when you deploy them. App fixes reach users only after review, and only after each person updates. That asymmetry changes how the work has to be organized.
A studio with real experience will propose staged rollouts so a faulty build reaches a fraction of users before everyone, crash and performance monitoring wired in from the first release, remote configuration or feature flags so behavior can be changed without shipping a new binary, and a policy for forcing updates when an old version becomes unsafe. It will also plan for backward compatibility, since some users will stay on old versions for a long time.
Agree in advance who watches the crash dashboard, what response time applies to a critical failure, how often routine releases ship, and who maintains compatibility when Apple and Google publish their yearly platform updates. Those obligations belong in the contract, not in goodwill.
Budgeting the engagement
Quotes vary enormously because the phrase mobile app covers everything from a simple catalog to a regulated financial product. Rather than comparing totals, compare the assumptions underneath them.
Cost rises with the number of distinct screens, whether both platforms ship at once, whether backend services must be built or already exist, how much of the design is bespoke, the depth of hardware access required, and any compliance obligations in health, finance or children's products. Ongoing cost includes store developer fees, backend hosting, third party services, monitoring tools and the maintenance arrangement.
Most studios sell either a fixed price against a frozen specification, a time and materials arrangement governed by a visible backlog, or a dedicated team retainer for continuous product work. Fixed price suits a well understood first version, time and materials suits a product still being shaped, and a dedicated team suits apps that will keep evolving. Ask for the estimate split by feature so scope can be cut deliberately, and ask what the first year after launch will cost before you sign for the build.
Shortlisting by market helps when timezone overlap and language matter for support. Comparing studios in the United States, Europe and Asia against one written brief is the fastest way to see how much of a price gap is location and how much is scope, and the project request form distributes that brief for you.
Questions for the shortlist call
- Which of your published apps are still live, and may we install them?
- Who specifically would work on this, and are they employed by you?
- Which device and operating system versions will you support, and how was that decided?
- How do you test on physical devices, and which ones do you own?
- What is your rejection history with both stores, and how did you resolve it?
- How do you handle analytics, crash reporting and user consent for tracking?
- Who owns the code, the store accounts and the signing keys?
- What does support cost after launch, and what response time comes with it?
Signing keys deserve particular attention. Losing the credentials that identify your app to the store is one of the few genuinely unrecoverable mistakes in this field, and they should be held by your organization with a documented backup.
Where mobile app projects fail
Shipping too much in the first version is the most frequent failure. A large launch delays feedback, and feedback is the only reliable guide to what should be built next. Ship a narrow version that does one thing properly.
Ignoring the backend is the second. Many apps are thin clients over services that were never designed for mobile traffic patterns, and the resulting slowness gets blamed on the app.
Treating both platforms as identical is the third. A layout copied pixel for pixel across iOS and Android feels wrong on at least one of them, and store guidelines differ in ways that affect approval.
Leaving no budget for the period after launch is the fourth, and the most expensive. The first weeks of real usage generate the bug reports and the behavioral data that determine whether anyone keeps the app installed. Plan for that phase as part of the project rather than hoping for it.
Browse mobile app companies by location and compare verified agencies in each market.
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Related categories
software companies · UX/UI design agencies
Frequently Asked Questions
Should I launch on iOS and Android at the same time?
Not always. Launching on one platform first lowers cost, shortens time to feedback and lets you fix the concept before doubling the surface area. Choose the platform your actual audience uses, which varies sharply by country and by segment. Simultaneous launch makes sense when the app supports an existing customer base that already spans both.
Who should own the App Store and Google Play accounts?
Your company, always. The studio should be invited as a team member with the access it needs. Accounts held by the developer create problems with reviews, ratings, transfers and payouts, and reclaiming a published listing later is slow and sometimes impossible.
What happens if the store rejects my app?
You receive the reason, fix the issue and resubmit. Most rejections concern privacy disclosures, permissions, account deletion, payment rules or listing accuracy rather than the code itself. An experienced studio treats this as a normal step and keeps a buffer in the launch schedule for it.
How much maintenance does a mobile app need?
More than a website. Apple and Google update their platforms annually, deprecate APIs, change privacy requirements and raise minimum build targets. An app left untouched will eventually stop being accepted for updates and may misbehave on new devices. Plan for continuing engineering time rather than a one off delivery.
Can a mobile app company also build my backend?
Many can, and it simplifies accountability when one team owns both sides. Confirm that the backend skills are in house rather than subcontracted, and keep the services documented separately so the backend can outlive any single app. If the server platform is the larger part of the work, evaluate specialist suppliers for it as well.
