How long does it take to build a mobile app from scratch? Every phase, from idea to the App Store

The short answer, by app type

The single biggest factor is not the platform or the code. It is how many kinds of user the app serves and how many other systems it has to talk to. The table shows where three common app types land in our projects.

Phase 1: Discovery and scope (1 to 2 weeks)

Discovery turns an idea into a written plan: who the users are, what they must be able to do in the first release, which systems the app connects to, and what can wait. The output is a feature list, user flows, a technical plan and, at OGB Labs, a fixed price for the build.

This is also the week to start the paperwork that has nothing to do with code. Your company needs an Apple Developer Program membership and a Google Play Console account, both as an organisation, and Apple asks for a D-U-N-S number. In our projects that number has taken from several days to two weeks to arrive. Our guide to publishing on the App Store and Google Play covers each step.

Phase 2: Product design and prototype (2 to 4 weeks)

Design starts with flows, the order of screens a user goes through, then moves to the look of each screen. The end product is a clickable prototype you can tap through on a phone and put in front of real users before any code is written. Changing a screen at this stage takes an hour. Changing it after it is built takes days.

An app with Arabic and English needs right-to-left layouts designed in from the start, not mirrored at the end. It adds design time, and saves far more in engineering.

Phase 3: Engineering (4 to 10 weeks)

Engineering is three builds running side by side: the app itself, the backend (accounts, data, payments, notifications and the APIs between them), and the admin panel your team uses to run it. For most business apps we build iOS and Android from one React Native codebase. We build fully native in Swift and Kotlin when the app leans on heavy graphics or hardware. Our guide to React Native vs native compares the two.

We release working software every week. Every week you get a build on your phone, through TestFlight on iPhone and an internal test track on Android, and a short demo of what changed. Weekly releases do not make the code faster to write. They cut the waiting: questions are answered within days, wrong turns are caught in one sprint instead of at the end, and there is no big reveal that sends the project back to design.

Phase 4: Testing (throughout, plus 1 to 2 weeks)

Testing is not a phase you bolt on at the end. Every weekly release is tested on real devices, old and new, small and large screens, slow networks. Before submission there is a final pass of one to two weeks: full regression testing, a closed beta with real users, crash and performance checks, and fixes.

• Functional testing: every flow works as designed, including the unhappy paths such as a failed payment or no signal.
• Device testing: the app on the range of phones your customers actually carry.
• Beta testing: TestFlight on iOS and a closed track on Google Play, with people outside the project.
• Security and privacy: data stored and sent safely, permissions only where needed, and the privacy details both stores ask for.

Phase 5: App Store and Google Play submission (about 1 week)

Submission means store listings, screenshots, privacy forms and the review itself. Apple says most submissions are reviewed within 24 hours, and Google Play typically reviews within a few days. Plan a week, because a first launch often gets one rejection and a second round.

One rule catches people out. On Google Play, new personal developer accounts must run a closed test with at least 12 testers for 14 days in a row before they can apply for production, as Google sets out in its testing requirements. Organisation accounts do not have this rule, which is one more reason to enrol as a company.

The step-by-step process, from idea to a live app

What makes app projects late

In our experience the code is rarely what slips. These are the usual causes, and each one can be started early.

• Content. Product photos, menu items, terms and Arabic copy arrive late more often than anything else.
• Payment gateways. A merchant account with a bank or gateway can take weeks to approve. Apply during discovery. Our guide to payment gateways in Oman lists the options.
• Third-party APIs. If the app reads from an ERP, a booking system or a partner's API, access and documentation decide the pace.
• Decisions. One approver who replies within two days is worth more than a committee that meets monthly.
• Scope growth. Every feature added mid-build pushes the release. Park new ideas for release two.
• Store accounts. A D-U-N-S number or organisation verification that starts late can hold up a finished app.

Can an app be built faster?

Yes, by changing what you build rather than rushing how. A progressive web app, a website that installs to the home screen, typically takes 4 to 8 weeks but does not appear in the App Store or Google Play. A smaller first release with one user role and the core flow can launch near the 8-week mark, with the rest following in monthly releases. AI coding tools speed up parts of engineering, but they do not shorten design decisions, device testing or store review.

For what the time translates to in budget, read how much a mobile app costs in Oman.

How OGB Labs helps

OGB Labs designs and builds iOS and Android apps for companies in Oman and the Gulf, from discovery to store launch and updates after it. A first release usually takes 8 to 16 weeks, the price is fixed after discovery, we release working software every week, and the app is published under your own developer accounts with the source code yours. See our mobile app development service and mobile app development in Oman, or message us on WhatsApp at +968 7111 0727.