BriefKit generates engineer-grade specification files for SaaS products. You fill a form, and BriefKit outputs a 14-file brief pack covering design system, database schema, security policies, auth flows, billing logic, and test cases. You paste these into Lovable, Claude Code, or Cursor and get a correct first generation.

Do I need to know how to code?

No. BriefKit is built for non-technical founders. The brief pack is the technical translation layer — you describe your product, BriefKit produces engineer-grade specs.

What if I need to change something after exporting?

Edit your brief and export a new version for $9. Your version history is saved and you get a clean migration brief between versions.

Why not just use my AI build tool directly?

Build tools are great executors but vague briefs lead to vague output. BriefKit gives them the exact spec they need to get it right the first time.

What's in the brief pack?

17 files: design system, constraints, database schema, RLS, API contracts, auth state machine, RBAC matrix, billing logic, webhooks, audit log, SEO, legal pages, accessibility, and screen briefs.

Can I use this with any AI build tool?

Yes. The brief pack is plain markdown formatted for prompt builders, agentic editors, design AIs, code editors, and full-stack tools.

What if the AI tool still gets it wrong?

Re-paste the relevant Screen Brief and add 'show me what you SEE, not what should happen.' The brief acts as the contract — it's much easier to course-correct from a spec.

Is this just a template library?

No. Templates are starting points; BriefKit generates a complete, customized spec for your specific product, including schema, RLS, and edge cases.

Build your app in ~19 prompts — not 200.

Vague prompts make AI build tools guess, rebuild, and burn your credits. BriefKit turns your idea into a 15-file engineer-grade spec pack you paste into Lovable, Cursor, Bolt, or Claude Code — so they build it right the first time.

Start your brief →See a sample pack

$9 per version · no subscription · works with Lovable · Cursor · Bolt · v0 · Claude Code

YOUR TYPICAL PROMPT

The first 2 hours on Lovable without a brief

0:00
Build me a SaaS with user accounts and payments
0:02
✓ Here's your app
0:08
Users can see other users' data. Fix it.
0:11
✓ Fixed the permissions
0:25
Signing up works but login says invalid credentials
0:28
✓ Fixed the auth
0:45
Payments go through but subscription doesn't activate
0:48
✓ Connected the webhook
1:10
Customer cancelled but still has full access
1:12
✓ Updated the cancellation flow
1:35
The free trial never expires
1:37
✓ Added trial expiry
2:00
None of these fixes actually worked when I tested them…

200+ iterations · $100 · 4–8 weeks

With BriefKit, this takes about 19 prompts. The brief prevents every issue above.

Start your brief →

How it works

Brain dump

Describe your product in one sentence. Then list every feature you're imagining — or let AI generate them for you.

AI triages your V1

AI scores every feature on 4 dimensions, recommends what to keep, simplify, or defer, and pre-fills your tech stack, roles, compliance, and integrations.

Review & confirm

See everything on one screen. Override any AI decision with one tap. You decide, we recommend.

Get your brief pack

14 engineer-grade files ready to paste into Lovable, Cursor, Claude Code, or Bolt. $9, yours forever.

Free tools — no signup required

RLS Policy Generator

Generate complete Supabase RLS SQL — SELECT, INSERT, UPDATE, DELETE policies for every table × role.

Try it →

DESIGN.md Generator

Build a complete DESIGN.md spec — CSS variables, type scale, spacing, and component specs.

Try it →

Want the full 14-file spec? $9 at briefkit.online.

What's in a brief pack

17 generated files. Every one prevents a specific failure mode.

What BriefKit generates

What this means

What this prevents

Design system

The exact colors, fonts, and spacing every screen should use — like a brand guide for your app

Design drift between screens

Constraint rules

A list of rules telling the AI what NOT to do — like guardrails on a highway

Scope creep, unrequested changes

Database schema

A blueprint of how your data is organized — think of it as the filing cabinet structure for your app

Restructuring everything at month 2

Same tools. Different results.

The difference between vague intent and a complete spec.

Without BriefKit

✗“Make me a SaaS dashboard”
✗200+ iterations, $100 in credits
✗Design changes every generation
✗Permission policies created ad-hoc, conflicting
✗Auth works for happy path, breaks on edge cases
✗No test users, no seed data, no way to verify
✗“Says it fixed it” — nothing changed
✗Payment webhooks silently fail
✗4–8 weeks to launch

With BriefKit

✓Engineer-grade spec: schema, RLS, API, auth states
✓~19 prompts, $9 + one month of build tool
✓Design locked via Global Brief
✓Master permission policy file — one source of truth
✓Auth state machine covers 6 states + transitions
✓6 test users, seed data, verification protocol
✓“Show me what you see, not what should happen”
✓Webhook idempotency, retry logic, failure logging
✓1–2 weeks to launch

Build something real, not a toy

Before BriefKit

You have screens that work

•Auth flow that mostly works
•A database with no defined relationships
•Payments that might activate subscriptions
•No documentation
•No spec to hand off
•Demo-ready, not production-ready

With BriefKit

You own an engineering asset

•A 14-file spec that documents every decision
•Database schema with relationships, types, constraints
•RLS policies enforcing security at the database level
•Test cases proving correctness
•Investor-ready blueprint
•Hand-off ready to any engineer or agency

What this means

You're not playing a game anymore

•Show your brief pack to investors as proof of structure
•Hand it to a technical co-founder when you raise
•Use it to vet engineering hires
•Use it to manage agencies and freelancers
•Sell your codebase later with full documentation

"Using AI without a brief is a vibe. Using BriefKit makes it a business."

Free: AI SaaS Pre-Build Checklist

The 15 things to define before your first prompt. PDF download, no signup required.

No spam. One email with the PDF. That's it.

Pay per version. Not per month.

Create and edit for free. Pay $9 when you finalize and export.

Brief pack

$9per finalized version

✓6 SaaS templates with complete defaults
✓Global Brief (design + schema + auth + billing + RLS)
✓8 Screen Briefs
✓5 Reference Docs
✓Formatted for any major AI build tool
✓Unlimited edits before finalizing
✓Version history with diff comparison
✓Migration briefs for v2, v3, v4…

No credit card until you export.

v1 — Launch

Your first complete brief pack. A full engineer-grade spec. Paste into your build tool and ship.

v2 — Add features

Adding team management? BriefKit generates the migration diff — new tables, updated RLS, new screen brief. 3 prompts to upgrade.

v3 — Scale

New pricing tier? Analytics dashboard? Partner API? Each version captures exactly what changed.

Most SaaS products need 3–5 versions in year one. That's $27–45/year for complete engineering specs.

Built for founders. Ready for engineers.

Your brief pack is your technical handover.

You don't need to understand database schemas or RLS policies to use BriefKit. But when you're ready to hire an engineer or hand off to a development agency, your brief pack IS the handover document.

Every file is written in the same format engineers use to spec real products. No translation needed. No "let me explain what I meant" meetings. Hand them the brief pack and they'll know exactly what to build — whether they use AI tools or write code from scratch.

Save your exported brief pack. It's the single source of truth for your product.

Hand to AI tool

Paste into Lovable, Claude, or Cursor. Brief is the prompt.

Hand to engineer

Send the brief pack as your technical spec. They skip 2 weeks of discovery.

Hand to agency

Share with a dev shop. Brief pack replaces the scoping phase.

💡 Tip: Export your brief pack and save it somewhere safe — Google Drive, Notion, or your project folder. This is your product's blueprint.

Works with every AI build tool

Lovable

Full-stack AI builder

Structured prompts that prevent permission conflicts and design drift

Claude Design

AI design tool

DESIGN.md with exact tokens so output matches your brand

Claude Code

Agentic code editor

Complete schema + API contracts for precise multi-file edits

UI-from-text generator

Tailwind config + component specs for pixel-perfect UI

Cursor

AI code editor

Multi-file specs: DESIGN.md + CONSTRAINTS.md + schema.sql

Bolt

Full-stack one-prompt tool

Spec that goes beyond 'build me a dashboard'

Replit

Prototype platform

Production-grade specs: auth, billing, RLS — not just prototypes

See what a brief pack looks like

# Northwind — Global Brief
## Generated by BriefKit | v1

## 1. DESIGN SYSTEM
--color-primary: #2563EB
--color-bg:      #FFFFFF
--color-surface: #F8FAFC
--color-text:    #0F172A
Display: DM Sans (700)  |  Body: IBM Plex Sans (400)
Radius: 8px  |  Density: Balanced  |  Animation: Subtle

This is one file in a complete brief pack.

Questions

Stop burning credits.
Start shipping product.