Best Mobile App Developers

Updated 2026-09-25

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A mobile app is one of the larger projects you can order from a freelancer, and one of the easiest to underestimate. Apps run into trouble when the feature list keeps growing, the app store accounts belong to the developer, or the source code is never handed over. This guide helps you set up the project so you stay in control.

We are finalizing our shortlist for this service. Until then, the guide below walks you through how to evaluate sellers yourself.

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What a good app project includes

App gigs range from small fixes and single features to complete apps. For a new app, the project should state:

Platforms: iPhone, Android or both, and the framework or language used.
A feature list, screen by screen, agreed before work starts.
Design: whether screens are designed by the developer or supplied by you.
Backend: user accounts, a database, an admin panel, and where they are hosted.
Milestones: what will be delivered at each step, and how you can test it on your own phone.
App store publishing: whether the developer submits the app for review.
Handover: full source code, logins for every service, and build instructions.
Support: how long bugs are fixed after launch.

How to brief an app developer

The problem the app solves and who will use it.
Core features for the first version, separated from later ideas.
Screens: a simple sketch or list of each screen and what happens on it.
Similar apps you like, with what you like about them.
Accounts and payments: sign-in methods, subscriptions or in-app purchases.
Other services the app must connect to, such as maps, payments or your website.
Your deadline and budget range, so the developer can suggest what fits.

If the app needs a website too, our website development guide covers that side.

App stores review every app before it goes live, and they can reject it for missing privacy details, broken sign-in or content rules. Ask the developer to include the review in the timeline, and prepare your privacy policy, app description and screenshots early.

What drives the price

number of screens and features
one platform or both, and native or cross-platform code
backend work: accounts, database, admin panel, notifications
payments, subscriptions and connections to other services
custom design and animation
app store publishing, testing and support after launch

Red flags

The developer wants to publish the app under their own store account.
No milestones, only one delivery at the end.
Source code is offered only as an expensive extra, or not at all.
A full app with many features promised in days for a very low price. This often means a resold template.
Portfolio apps that cannot be found in the app stores or tested.

Split a large app into milestones and review each one on your own phone before approving it. This keeps problems small and cheap to fix.

Quick pre-order checklist

I have a short list of core features for the first version.
The app store accounts will be in my name.
I will receive the full source code and build instructions.
The project is split into milestones I can test.
I know what support is included after launch.

FAQ

Should I build for iPhone, Android or both?

Start where your users are. Many developers use a cross-platform framework, such as Flutter or React Native, to build both from one codebase. Ask the developer which approach they recommend for your features and why.

Who should own the app store accounts?

You should. Create the Apple and Google developer accounts in your own or your company's name, and add the developer as a team member. Apps published under the developer's account are hard to move later.

Will I get the source code?

Make sure you do. Ask for the full source code in a repository you control, with instructions to build the app. Without it, another developer cannot continue the work.

What happens after the app is published?

Apps need updates when phone operating systems change, plus bug fixes. Ask what support is included after launch and what ongoing maintenance costs.

Can I start with a smaller version?

Usually that is the best plan. A first version with only the core features, often called an MVP, lets you test the idea with real users before paying for everything on your list.