How long does it take to build a mobile app?

A focused first version typically takes a few months of work; larger apps take longer. Calendar time also includes things that are not programming: design decisions, testing on real devices, store review and fixing what review or testers find.

By Nazar Kashuba · Reviewed

Timelines vary with scope so much that any universal answer misleads. What can be explained is where the time goes.

Where the time goes

  1. Defining and designing. Deciding the flows and how they look. Skipping this moves the cost into rework.
  2. The back end. Accounts, data, sync and the interface the app talks to.
  3. The app itself. Screens, logic, offline behaviour, notifications.
  4. Testing. On several devices and operating system versions, including poor connections.
  5. Store submission and review. Apple reviews each submission; first-time apps can need more than one attempt, and each round costs days.

What lengthens it

  • Scope that grows during the build.
  • Late decisions or changing requirements.
  • Dependence on third parties: payment approval, data from partners, legal text.
  • Unusual features such as complex offline sync or hardware access.

What shortens it

  • A small, clear first version.
  • One person who decides.
  • Content, accounts and legal documents ready before they are needed.
  • Starting with one platform if the audience allows it.

Treat store review as part of the schedule, not an afterthought: plan a buffer for a rejection and a resubmission.

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