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App Development Cost & Requirements Planner

Turn an app idea into an MVP range. Separate Must, Should and Later features, expose implementation risk, and keep a requirements outline for vendor conversations.

Use the tool

Estimate the product, not just the screen count

App cost changes with much more than the number of screens. Roles, data relationships, platform coverage, admin needs, payments, messaging, offline sync, integrations, security, AI evaluation and release QA all change the delivery system.

This planner keeps those workstreams separate. It also forces feature priority so version one is not priced as every idea at once. The export can start a product requirements document, but it does not replace technical discovery.

How the method works

Choose the first platform, screen/state count, roles, data complexity and design readiness.
Mark each feature Must, Should or Later. Only Must and Should enter the current estimate.
Add integrations, data sensitivity and any AI implementation work.
Set editable low/high rates and weekly team capacity.
The model totals discovery, UX/UI, client app, backend, modules, integration, security, QA, release and project-management ranges.

Worked example

A responsive web app with 12 major screens, two roles, related workflows, wireframes, an admin portal, payments, notifications and two standard integrations produces 413-1098 planning hours. At £50-£110 per hour, that example becomes £20,650-£120,780.

Move messaging and offline sync from Later into Must and the range rises because both add state, failure recovery and QA.

What this result cannot tell you

The tool cannot determine architecture, code quality, data migration, API reliability or regulatory obligations from a form. Model/API usage, licences, app-store fees, taxes and post-launch maintenance are excluded. A high-risk or regulated app needs qualified security and legal review.

Frequently asked questions

How accurate is an app cost calculator?

It is useful for comparing scope scenarios and finding cost drivers. It is not accurate enough for a contract until architecture, dependencies, acceptance criteria and team responsibilities are verified.

What counts as a screen?

Count a major user-visible state or workflow view, not every modal or minor variation. The estimate also prices backend, integrations and QA separately.

Does the estimate include AI usage costs?

No. It estimates implementation effort only. Model, vector database, speech, messaging and other usage costs need a separate operating budget.

Should I build web and mobile together?

Only when both are required to prove the product. The planner shows the extra client, state, release and device QA work so you can test a smaller first platform.

What is the difference between Must and Should?

Must means version one fails its core user job without the feature. Should means valuable but negotiable. Later is recorded without entering the current estimate.

Can I export the requirements?

Yes. The result downloads as structured Markdown with scope, priorities, workstreams, risks and exclusions.