01 / Brief
Scope locked
Offer, constraints, stack, risks and delivery plan are fixed before the sprint.
21day.studio
The build, visualized
Scattered parts become a shipped product.
The same way we assemble yours — over 21 focused days.
21Day is the product studio for founders and teams who need a real, production-ready product — not slides. Fixed price, full code ownership, 30-day warranty.
Offer, constraints, stack, risks and delivery plan are fixed before the sprint.
Every working day ships a visible increment, written update and next decision.
Milestones, files, requests and delivery history stay in one operational surface.
Production handoff with source ownership, rollback path and 30-day warranty.
21Day OS
The modern stack we ship on
The same way we assemble yours — over 21 focused days.
Fixed scope, fixed price, and a finish line on the calendar. You always know what's happening and what you'll pay.
One quote within 24 hours. No hourly billing, no surprise invoices.
Every line of code and asset is yours from day one. No lock-in, ever.
A written update every working day. Watch your product take shape.
We fix any functional bug free for 30 days after launch.
Five steps. One fixed timeline. No scope creep.
We map the product, the must-haves, and the edges. No fluff.
A clear, fixed quote and a start date. You decide.
Parallel, focused development with a written update every day.
You review in a real environment. Unlimited iterations within scope.
We deploy, hand over 100% of the code, and warranty it for 30 days.
One team across design and engineering — so the thing actually ships.
Dashboards, SaaS, marketing sites — fast, accessible, SEO-ready.
iOS & Android from one codebase, store-ready.
Auth, billing, multi-tenant — the hard parts, done right.
LLM features and workflows that remove real manual work.
CI/CD, observability, and cloud that scales without drama.
UX and UI that looks premium and converts.
A few products we designed, built and launched end-to-end.
days, kickoff to launch
to a fixed quote
of the code is yours
day functional warranty
