How long it actually takes to build an app

“How long will it take?” is one of the first questions every app idea runs into, and the honest answer is that it depends. But realistic ranges can be given, along with what drives them. Most of what pushes back a timeline doesn’t sit with the developers, it sits with the buyer: how quickly decisions get made, how feedback is given, and when content arrives.

Timelines by project type

The ranges below cover the whole path: design, development, and testing, up through an app ready to submit for review. They assume the work flows without long pauses.

A simple app has a handful of screens, login, and content from a simple API. A mid-complexity app has its own backend, several user roles, payment, and maybe a couple of integrations. A complex app has real-time data, heavy integrations with business systems, and high security requirements. The further down the table, the more time goes to things other than pure coding, mainly testing and coordination.

A common misconception is that time is mostly code. In reality, design and testing often take just as much, and the many small decisions along the way carry real weight. An app that “just” needs to be built fast can still take months if every decision has to wait for an answer.

What pushes back the timeline

Most delays are predictable, because they recur project after project. Four factors stand out:

• Decision pace. Every time a decision drags on, dead time appears. A project where the buyer responds within the same week moves noticeably faster than one where answers take weeks.
• Feedback. Consolidated, clear feedback drives the project forward. Scattered, conflicting, or constantly revisited feedback creates rework that eats time.
• Content. Text, images, and data the app needs are surprisingly often a bottleneck. If the content isn’t ready, the app can’t be either.
• Growing scope. Every “could we also have…” added after the start pushes back the plan. It’s the most common reason timelines slip.

The reassuring part is that the buyer controls most of this. A clear set of requirements from the start, fast decisions, and content delivered on time shorten the timeline more than any technical optimization. Throwing more developers at it, on the other hand, rarely helps on a small project, since more people also require more coordination.

Factor in the app stores’ review

A step often forgotten in planning is that the app must be reviewed by Apple and Google before it becomes visible in the stores. Review usually takes anywhere from a day to a few days, but it’s not guaranteed to be fast. An app can get rejected and need fixing before it clears, which adds another round.

So build review into the timeline, with margin. That matters especially if the launch is tied to a date, a campaign, or an event. Planning as if approval arrives in a single day builds unnecessary stress into the final stretch, right when everything else also needs to line up.

A worked example

Say you want to launch a mid-complexity booking app in time for fall. The build is estimated at six months including design and testing. You can’t then start in March and expect a September launch with no margin. Add time for review, and a buffer for decisions and content occasionally running late, and you should really start in February to land safely. The point: plan backward from the launch date, with review and buffer included, instead of assuming everything goes exactly as scheduled.

The best way to hold a timeline is to start with a clear brief. Read more about how a discovery phase lays the groundwork among our services, or get in touch with your idea and we’ll give a realistic timeline for it.