Timeline guide

How Long Does It Take to Build a Mobile App?

Eight to twelve weeks from approved scope to a published first version is the normal range for a defined product. Operational systems with integrations run longer. The number everyone quotes is measured from a starting line most people have not reached yet, which is why timelines slip before development even begins.

Discovery and scope before the clock starts Design overlaps the first sprints Development sprints the bulk of the calendar QA runs alongside, not after Hardening and store submission review measured in days 8 to 12 weeks, approved scope to published
Clock starts at approved scope iOS and Android together Store review in days Timelines given with conditions
8 to 12 weeks
Defined first version, approved scope to published
10 to 14 weeks
Narrow first version of an operational system
14 to 22 weeks
Full operational system with integrations
Days
Typical store review once you submit
The honest answer

Why does every agency say eight to twelve weeks?

Because that is roughly how long the building takes once everything is decided. It is an accurate number and a misleading one, because the clock starts at approved scope. Everything before that line, deciding what the product does, agreeing what is excluded and getting access to accounts, is not in anyone's estimate and is where most of the real calendar disappears.

A timeline without conditions attached is fiction. An honest one names what it depends on: how fast one person on your side can decide, when developer accounts exist, and when third party access arrives.

That is why we quote a timeline together with the scope, not before it. A date agreed against an undefined scope moves the moment the scope is written down, which helps neither side.

Where the weeks go

What actually takes the time?

Development sprints take the largest share, but they are rarely what makes a project late. Design overlaps the first sprints, QA runs alongside development rather than after it, and store review is measured in days. The late weeks almost always come from decisions and access, not from writing code.

Before the clock starts
What happensDiscovery, product brief, scope list with exclusions, estimate.
What sets the paceHow quickly your side can answer questions about the operation.
Done whenScope and price are signed and both sides know what is excluded.
Design
What happensUser flows, clickable prototype, design system, exported assets.
What sets the paceApproval rounds. One decision maker keeps this short, a committee doubles it.
Done whenYou have clicked through the prototype and approved the flows.
Development sprints
What happensThe agreed scope built in two week increments, each ending with an installable build.
What sets the paceScope size, number of integrations, and how fast blocked questions get answered.
Done whenEvery item on the scope list is implemented and demonstrated.
Hardening and release
What happensFinal QA across devices, store listings, privacy declarations, submission.
What sets the paceWhether store accounts were set up early and whether the payment model raises questions.
Done whenBoth apps are live on your own developer accounts.
Thomas Siudut, Co-Founder and CEO at Apps Value
Describe what the app has to do and a 30 minute call is usually enough to tell you whether your date is realistic.
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By type

How long does each kind of app take?

A defined first version runs eight to twelve weeks. A narrow first version of an operational system runs ten to fourteen. A full operational system with integrations and multiple roles runs fourteen to twenty two. The difference is not screen count. It is how many outside systems and user roles the product has to be correct about.

A defined first version

One main user group, its own backend, a clear feature set. Eight to twelve weeks from approved scope to both stores. This is the most common shape and the most predictable.

A narrow operational system

One workflow for one team, for example technicians recording work in the field. Ten to fourteen weeks, because the rules come from a real operation rather than from a design.

A full operational system

Multiple roles, integrations with systems you already run, offline behaviour, reporting for the office. Fourteen to twenty two weeks, and the integrations are what sets the pace.

Marketplaces and booking products sit between the first two, and payments push them toward the upper end because store rules and edge cases add a stage that a purely internal tool does not have.

What actually causes delay
  • Developer accounts are not ready. Setting up and configuring an Apple developer account is not a quick task, and it has delayed real releases for us.
  • Approvals go through a committee. Without one person who can decide, every design question becomes a week.
  • Third party access arrives late. Missing keys for a system you already own stop a sprint faster than any technical problem.
  • The payment model raises questions in review. On marketplaces, bookings and subscriptions, Apple checks whether payments belong in app purchases. Solvable, but plan for it.
  • Requirements appear during real use. Some rules exist nowhere except in how people work, and they surface when your team tests in real conditions.
Risk

What makes projects late?

None of these are engineering problems, which is why they rarely appear in an estimate. They come from the client side and from the platforms, and they are all predictable enough to plan around.

What we do about them is unglamorous. Store and service accounts are set up during technical setup rather than in release week. The scope list names exclusions, so a change is a priced decision rather than an argument. And we ask early who on your side can approve, because that one answer moves the date more than anything we control.

If you want the full picture of what a project needs from the client, we wrote it up stage by stage in this guide.

Going faster

Can you build it faster?

Yes, in three ways, and adding developers is not one of them. Cut the scope of version one, put one empowered decision maker on your side, and prepare accounts and access before the first sprint. Those three routinely save weeks. A larger team on a fixed scope usually costs more and delivers no earlier.

Cut version one, not quality

The fastest release is the one with fewer things in it. Everything cut is written down as excluded, so it returns as a decision later rather than being lost.

One person who can decide

Not a committee, not a weekly steering call. Someone reachable who can answer a design or scope question the same day.

Accounts and access on day one

Apple and Google accounts configured, API keys issued, test data available. This alone removes the most common cause of a slipped launch.

What does not work

Adding people to a project that is already late, skipping QA to hit a date, and submitting to the stores before the payment model is settled. Each of those buys days and costs weeks.

The date you agree is only as real as the scope it was measured against. A timeline attached to an undefined scope is a guess that both sides will later remember differently.
This is why we give the timeline and the scope list together, with the conditions written next to them.
About Apps Value

Who is answering this

Apps Value is a mobile app development company based in Krakow, Poland, building iOS and Android products in Flutter and React Native for clients in the United States and Europe. The ranges on this page are the ones we quote and work to, not industry averages collected from elsewhere.

CompanyApps Value, mobile app development company
LocationKrakow, Poland, Central European Time
Experience6 years building mobile products, 19+ projects delivered, 13+ positive client reviews
First version8 to 12 weeks from approved scope to a published app
Operational systems10 to 14 weeks narrow, 14 to 22 weeks with integrations
Sprint rhythmTwo weeks, each ending with an installable build and a written summary
TechnologiesFlutter with BLoC and Riverpod, React Native, NestJS, Supabase, PostgreSQL
FAQ

Questions we get about timelines

How long does it take to build an MVP?

Eight to twelve weeks from approved scope to a published app, for a first version with a clear feature set and one main user group. If someone quotes four weeks, ask what is excluded, because something always is.

Does building for both iOS and Android take twice as long?

No. With Flutter or React Native both platforms come from one codebase and one release cycle, so the second platform adds testing and store work rather than a second build. That is the main practical reason we default to cross platform for business products.

How long does App Store review take?

Days rather than weeks in normal cases. What extends it is a question about your business model, particularly on marketplaces, bookings and subscriptions, where Apple checks whether payments should run through in app purchases. It is resolved by explaining the model, and it is a stage to plan for rather than a surprise.

Can I get it done faster by paying more?

Sometimes, but not by adding developers to a fixed scope. What genuinely compresses a timeline is cutting version one, having one person who can decide, and preparing accounts and access before the first sprint. Those cost nothing and save weeks.

How much of my own time does this take?

The commitment is availability rather than a set number of hours. Discovery and design need real attention, and during sprints someone should be reachable to answer a question the same day. The single most useful thing you can provide is one person empowered to decide.

What if we change our mind mid project?

Changes are estimated, you decide whether they go into this release or the next one, and it is written down. That keeps the date honest. What damages a timeline is absorbing changes silently and explaining the delay afterwards.

When does the timeline actually start?

At approved scope, which means a signed scope list with its exclusions named, not at the first conversation. Everything before that depends on how fast decisions get made on your side, which is why we do not quote a date against an idea.

How long does it take to take over an existing app?

The audit comes first, and it is quick. What follows depends entirely on the state of the code, whether it can still be built with current tools, and what documentation exists. We give a timeline after the audit rather than before it, because any number offered earlier would be invented.

Thomas Siudut, Co-Founder and CEO at Apps Value

Tell me your deadline and I will tell you if it holds

Bring the date you are working to and what the app has to do. I will tell you what fits inside it, what does not, and where the risk sits, whether or not you end up working with us.

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