Agency quotes swing from $5k to $150k for the same brief. Here is what moves the number, and what you can safely cut.
Nobody quotes an app the same way twice. Ask five studios for the same feature list and you will get five numbers with a 20× spread between them. That is not dishonesty — it is that the brief you sent describes maybe 40% of the work.
Here is what actually drives the figure, in rough order of impact.
Auth and payments cost more than they look
Email and password is a day. Social login is two. Phone OTP with a real provider, retry handling and rate limiting is closer to a week once you account for the edge cases nobody demos — the number that already exists, the SIM swap, the user who never receives the code.
Payments are the same story. Taking a card is straightforward. Handling a failed renewal, a refund, a chargeback and a receipt that survives an audit is the actual project.
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Offline is a rewrite, not a feature
If offline support arrives after the app is built, it is not a feature you add — it is a data layer you replace. Decide before the first sprint. If your users are on patchy connections, budget for it up front and it costs perhaps 15% more. Bolt it on at the end and it costs 60%.
What you can cut without regret
Dark mode at launch. In-app chat. A custom design system when an off-the-shelf one gets you to market two months sooner. Push notifications beyond the two that matter. Admin dashboards that a spreadsheet handles for the first hundred customers.
What you cannot cut: crash reporting, analytics on the activation path, and a real QA pass on physical devices.
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