How Long Does It Take to Build an App?
Direct Answer
A simple mobile app MVP with 5–8 screens takes 6–10 weeks. A medium-complexity app with 10–20 screens and backend integration takes 12–20 weeks. Complex apps with AI, real-time features, or enterprise integrations take 5–12 months.
App Development Timeline by Phase
**Discovery & Requirements** (1–2 weeks) Defining scope, user stories, and technical architecture. Rushing this phase is the #1 cause of delays later.
**Design (UX/UI)** (2–4 weeks) Wireframes, then high-fidelity UI design and clickable prototype. Runs in parallel with backend setup.
**Frontend Development** (4–12 weeks) Building all screens, navigation, and UI interactions in Flutter or React Native.
**Backend Development** (4–10 weeks) API design, database setup, authentication, and business logic. Often runs in parallel with frontend.
**Integration & Testing** (2–4 weeks) Connecting frontend to backend, third-party API testing, and QA across devices.
**App Store Submission** (1–3 weeks) Apple review takes 1–3 days on average; Google Play typically 2–3 days. Account setup and metadata preparation adds time.
What Slows Down App Development?
**Unclear Requirements** — The most common cause of delays. Every requirement change mid-development costs 3× what it would have cost to get right upfront.
**Scope Creep** — Adding features during development extends timelines. Lock scope before development begins.
**Slow Feedback** — Delayed client feedback on designs and demos halts development. Commit to 48-hour feedback turnarounds.
**Third-Party API Issues** — Unreliable APIs, poor documentation, and rate limits cause unexpected delays.
**App Store Rejections** — Apple's App Store can reject apps for policy violations, adding 1–4 weeks if significant changes are needed.