"How long will my app take to build?" is one of the most common questions we hear — and one of the most commonly underestimated. App development timelines shared online often reflect best-case scenarios. Real projects include discovery, design, revisions, testing, and unforeseen complexity.
This guide gives you realistic timelines for different types of mobile apps, explains what drives duration, and highlights the factors that cause projects to run over.
Realistic app development timelines
| App type | Realistic timeline |
|---|---|
| Simple MVP (limited features, single platform) | 3 – 5 months |
| Mid-complexity app (cross-platform, auth, backend, integrations) | 5 – 9 months |
| Complex app (real-time features, custom backend, multiple integrations) | 9 – 18 months |
These figures assume a dedicated development team working full-time. Part-time teams or agencies juggling multiple projects will take longer.
What each phase takes
Discovery and scoping (2–4 weeks)
Understanding requirements, defining user journeys, technical architecture decisions, and producing a detailed specification. Skipping this stage saves time initially and costs significantly more later when scope is unclear mid-build.
UX wireframing and design (3–6 weeks)
User flow design, wireframes, and full visual design for all screens. This phase often takes longer than expected because clients need time to review and stakeholders may have conflicting views. Budget for at least two rounds of revisions.
Development (8–20 weeks depending on complexity)
Frontend development, backend/API development, integration work, and admin dashboard (if required). This is the longest phase and the most sensitive to scope changes — adding features mid-build is always more expensive than including them in the original spec.
QA and testing (2–4 weeks)
Testing across devices, OS versions, and network conditions. Integration testing. User acceptance testing (UAT) with your internal team. App Store review — Apple typically takes 1–3 business days; Google Play is usually faster but variable.
Launch and post-launch (1–2 weeks + ongoing)
Submission to the App Store and Play Store, monitoring post-launch, and addressing any issues that surface in the real world.
What causes app projects to run over schedule?
- Scope changes mid-build — the most common cause by far
- Slow feedback cycles — clients taking weeks to review designs or UAT builds
- Underspecified integrations — third-party APIs that behave differently from documentation
- Backend complexity discovered late — especially with legacy system integrations
- Apple App Store review delays — rejection for policy reasons can add 2–4 weeks
How to give your project the best chance of hitting its timeline
- Define scope thoroughly before development begins — agree what's in and what's out
- Assign a named internal contact who can make decisions quickly
- Review and approve deliverables within agreed timeframes
- Keep the MVP scope conservative — additional features can follow in version 2
- If you have a hard deadline (trade show, event, product launch), work backwards from it during scoping
Get a timeline for your app
We'll scope your requirements properly and give you a realistic timeline — one that accounts for design, testing, and real-world complexity, not just the development phase.