A mobile app takes 3–4 months to build for a simple single-platform release, 5–7 months for a mid-complexity app with integrations, and 8–12 months or more for a complex product with custom backend systems, real-time features or both native platforms. The timeline is driven almost entirely by scope — feature count, integrations and platform count — not by how many developers you add late.
TL;DR
- Simple app: 3–4 months. Mid-complexity: 5–7 months. Complex: 8–12+.
- Scope drives timeline; adding developers late rarely compresses it.
- Integrations are the most common cause of schedule slip.
- A working MVP first release is achievable in 3–4 months.
- Plan 4–6 weeks of app-store review and launch polish on top.
Mobile app timelines at a glance
- 3–4 months — simple single-platform app (core screens, one platform)
- 5–7 months — mid-complexity app (both platforms, integrations)
- 8–12+ months — complex product (custom backend, real-time)
How long does it take to build a mobile app?
The honest answer depends on what you count as "built." Most owners mean a production release their customers can use — which includes design, development, testing and app-store review, not just coding.
| Tier | What it looks like | Typical timeline |
|---|---|---|
| Simple | 4–8 screens, one platform, no custom backend, standard payments | 3–4 months |
| Mid-complexity | User accounts, push notifications, third-party integrations, both platforms | 5–7 months |
| Complex | Custom backend, real-time features, offline sync, security or compliance work | 8–12+ months |
Two factors dominate the calendar. First, integration count: every external system — payments, shipping, CRM, analytics — adds build and, more importantly, test time. Second, platform count: a cross-platform build covers iOS and Android together and typically saves 25–35% of the timeline versus two native codebases.
For the money side of the same decision, Syndell's guide to mobile app development cost pairs each of these tiers with a budget range.
What actually happens in those months
- Discovery and design (3–6 weeks). Wireframes, a clickable prototype and a locked feature list. Skipping this phase is the number-one cause of mid-project redesigns — Syndell's guide to the what a software discovery phase includes covers what it should include.
- Core build (8–16 weeks). The screens, accounts, payments and integrations, built in two-week increments you can see.
- Testing and polish (3–6 weeks). Real-device testing, performance tuning and accessibility fixes. Compressing this is how apps collect one-star reviews in week one.
- App-store review and launch (1–2 weeks). Apple's review alone can take several days to over a week, with a rejection-and-resubmit cycle common on first submissions.
Can an app be built faster than three months?
A genuinely minimal app — a few screens on one platform, no accounts, no integrations — can ship in 8–10 weeks. But that is rarely the product the business needs; the three-month floor reflects what real customers expect from a v1, including accounts, payments and notifications.
Why do app projects slip past their estimate?
Integrations and unmade decisions. A payment gateway that needs compliance review, a shipping API with poor documentation, or a client-side approval bottleneck of two weeks per question adds a month across a project. Teams that lock the feature list before development start consistently land closer to the original date.
Does hiring more developers shorten the timeline?
Rarely. Past a certain team size, coordination overhead eats the parallelism — the classic software-engineering result that adding people to a late project makes it later. The reliable lever is cutting scope from v1, not adding headcount to it. Syndell's guide to hiring a dedicated development team covers how team structure affects delivery speed.
One last thing
The single best predictor of an on-time app launch is a frozen feature list for v1. Everything discovered after launch goes into v1.1 — not into the release that is already three weeks late. If a vendor quotes you a timeline without a written scope behind it, the timeline is a guess. Syndell's mobile app development team quotes timelines only against a scoped feature list, and our app development company in New York team runs that scoping with US founders before any build contract is signed.
Get a realistic app timeline
See the month-by-month plan for your feature list before you commit.
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Related Questions
How long does it take to build a mobile app?
A simple single-platform app takes 3–4 months, a mid-complexity app with integrations 5–7 months, and a complex product with a custom backend 8–12 months or more.
How long does it take to build an app for both iOS and Android?
A cross-platform framework builds both platforms together and typically saves 25–35% versus two native codebases — mid-complexity apps land in 5–7 months instead of 8–10.
Why do app projects run late?
Integrations with external systems and unmade product decisions. Both are controllable: lock the scope before development and assign a decision-maker on your side.
