How Long Does It Take to Build a Mobile App? Realistic Timelines
The short answer: 3-6 months for most business apps. But timelines vary wildly based on decisions you make in the first two weeks. Here's what to expect.
By Alin, Artificially · · Product
We get this question weekly: "How long will my app take?" And while the honest answer is "it depends," we can give you realistic ranges based on dozens of apps we've shipped to both the App Store and Google Play.
Timeline Ranges by Complexity
- Simple app (content display, user profiles, basic interactions): 8–12 weeks. Think: company directory, event guide, internal tool.
- Medium app (user authentication, payments, push notifications, API integrations): 12–20 weeks. Think: booking app, marketplace, fitness tracker.
- Complex app (real-time features, AI, chat, complex business logic, admin panel): 20–30 weeks. Think: fintech platform, healthcare app, social network.
These ranges assume a focused team of 2–3 developers working full-time. Add 20–30% if you're working with a team that's splitting time across multiple projects.
Where the Time Actually Goes
Most people underestimate how much time goes into things that aren't "building screens":
- Discovery and planning (2–3 weeks). User flows, wireframes, technical architecture, API design. Skipping this phase doesn't save time — it adds 2–3x more time in rework later.
- Backend and API (30% of total time). The app is the tip of the iceberg. Behind it sits a server that handles authentication, data storage, business logic, push notifications, and integrations.
- Testing (15–20% of total time). Not just "does it work?" but "does it work on 50 different Android devices, with slow connections, when the user does something unexpected?"
- App store submission (1–2 weeks). Apple's review process alone can take 1–7 days per submission. Rejections happen — usually for subscription flow issues or privacy policy gaps. Budget for 2–3 submission cycles.
What Causes Delays
The biggest timeline killers we see:
- Changing requirements mid-build. Every significant change to core functionality adds 1–3 weeks. This is normal and expected, but needs to be managed. A clear change process prevents timeline chaos.
- Third-party integrations. Payment processors, maps, social login, analytics — each integration has its own documentation quality, API quirks, and support response time. Budget 1–2 weeks per complex integration.
- Platform-specific issues. Android fragmentation is real. An app that works perfectly on a Samsung Galaxy S24 might break on a Xiaomi Redmi. iOS has fewer devices but stricter review guidelines.
- Slow feedback cycles. If it takes your team a week to review and approve each sprint, you've effectively doubled the timeline. The fastest projects have a product owner available daily.
Native vs Cross-Platform: The Timeline Impact
- Cross-platform (React Native, Flutter): One codebase, both platforms. Saves 30–40% of development time compared to building two native apps. Trade-off: some advanced platform features are harder to implement.
- Native (Swift + Kotlin): Best performance and platform integration, but you're building everything twice. Timeline is 1.5–2x cross-platform.
For most business apps, cross-platform is the right choice. We use React Native for the vast majority of our projects — it's mature, performant, and lets us ship to both platforms without doubling the team.
How to Keep Your Timeline on Track
- Invest in discovery. Two weeks of planning saves two months of rework.
- Prioritize ruthlessly. Launch with 5 great features, not 15 mediocre ones.
- Stay available. Daily access to a decision-maker keeps the team moving.
- Plan for app store review. Don't announce a launch date without 2 weeks of buffer for the review process.
- Start the backend first. API design and backend infrastructure should begin in week 1, not when the UI is "done."
Need help with a similar project? Book a free 15-minute discovery call with Artificially.