App Build Playbook · Simply Plugged

Prototype first · Build second

Discovery Call

Google Meet with client. Understand idea, roles, must-have features, and timeline.

Technical Flow Sheet

Simple-language document explaining the full app flow. Client approves.

Sign-off A

HTML Prototype

You build fast in Cursor — mobile-first HTML/Astro on Cloudflare Pages. Full UI + flow feel.

Developer Check

Internal only. Confirm feasibility, fixed dev cost, timeline, and risks before quoting client.

Client Quote

Development fees + your margin. Hosting, APIs, domain, Play Store — all on client.

Prototype Approval

Client tests on phone & laptop. Advance payment after approval.

Sign-off B

App Build

Developers replicate approved prototype in Flutter. No UI guessing.

QA + UAT

You verify against prototype. Client tests APK. Fix bugs within scope.

Launch

Play Store submission, handoff, and support as scoped.

Change Loop

Any change → update HTML prototype first → client approves → developers implement.

Clear ownership

★ You

Client communication & vision
UI / UX & HTML prototype
Approvals, pricing & QA
Keeping prototype as source of truth

⚙ Developers

Flutter app build from approved spec
Backend, API & integrations
Bug fixes within approved scope
Release support if scoped

✓ Client

Approves flow & prototype
Pays advance & milestones
Owns hosting, APIs, domain accounts
Tests APK & gives feedback

80% fixed · 20% flexible

80% Structure 20% Flexibility

Fixed (hold firm)

Approved prototype = source of truth
Major new features = chargeable
Hosting, APIs, domain, Play Store = on client
Advance before development starts
No CodeCanyon scripts — custom build only

Flexible (case by case)

Small UX tweaks after first APK
Wording & field adjustments
Edge cases nobody predicted
Decided in real time — not a fight

Included vs Billable

Included: bugs, minor UI fixes within approved screens
Billable: new modules, roles, integrations, major redesign

Cost model: You charge development fees only. Cursor cost not counted. Third-party & server costs always on client.

Live reference

Cloudflare Pages Prototype

Airport Transfer

Mobile-first HTML prototype we built. Client can open on phone or laptop and feel the full app experience before Flutter development.

9:41

Airport Transfer

Minimum 6 hours advance booking

Fixed Price 10% OFF

Select ride → Schedule → Confirm

Open Live Prototype →

Remember: Build every new client project prototype like this first. Get approval, then hand the exact spec to developers. Never start Flutter before the client has seen and approved the flow.