Sinter gives you everything between “it works” and “it’s safe to go live.” Auth, payments, quality gates, and a design system. Designed for Claude Code, with workflows and verification gates that catch hallucinations before they become bugs.
30+ accessible components built on Base UI. Structured tokens, consistent patterns, and an interactive viewer to see it all before changing a thing. Need a new component? Claude builds it in your style.
“16 years designing products. Over a year building full-stack with Claude Code, for clients and for my own products. Sinter is everything I learned about going from prototype to production, packaged so you don’t have to learn it the hard way.”
Jonte Edvardson, Founder
Stop debugging infrastructure. Start building features.
$249 one-time. Lifetime access to the codebase. Use on unlimited projects.
AI got you started. Now the codebase is fighting you.
You vibe coded a working app. Maybe with Lovable, maybe Bolt. It has auth, payments, a database. It works. But past a handful of screens, things unravel. The fixes that break other fixes. The auth nobody audited. The database one URL away from public. It's not a future problem. It's the next deploy.
What works at first
What breaks at scale
Auth and payments in minutes
No roles, no row-level security, no audit trail. The first enterprise review ends the conversation.
Fast iteration on features
Every fix breaks something else. You're burning credits fixing the AI's fixes, not shipping.
One database table does everything
Pages take 4 seconds to load. Your serverless bill keeps climbing.
Deploy in one click
One bad Friday deploy and your users see a blank screen all weekend.
AI generates code quickly
Webhooks crash silently. Payments fail. You find out when customers email, not when your system alerts you.
Everything you need to go live. Nothing you don’t.
01 · INFRASTRUCTURE
The boring parts are done. Properly.
Auth, payments, email, security scanning, CI/CD, and a complete design system. Configured, tested, and working together. Run /setup in Claude Code and start building features, not plumbing.
Plus structural quality gates that run whether or not you remember them — catching problems while you focus on the feature. They cover what AI-generated code typically misses: circular imports (DPDM), dead code (Knip), enforced coverage thresholds, accessibility regressions (axe), and OWASP LLM Top 10 violations.
~40 gates across pre-commit, pre-push, and CI. Every release includes a Software Bill of Materials in CycloneDX and SPDX formats.
02 · AI COLLABORATION
The best way to start building with Claude Code.
Curious about Claude Code but not sure where to start? Sinter gives you a real codebase with a complete methodology already built in. Run /think to explore an idea before writing any code. Run /bootstrap to turn a PRD into a GitHub project board. The workflow surfaces lessons from past work, stress-tests edge cases up front, and pre-screens your PR before opening. Verification gates catch hallucinations before they become bugs. And when you want a second opinion, on-demand audits check your UI's visual design, copy, and accessibility against your own standards.
Plus 6 service integrations via MCP. Claude doesn't just write code for your services. It operates them. Ask for yesterday's signups (PostHog), refund a customer (Stripe), run a Supabase migration, deploy the staging branch (Vercel), or check the cache (Upstash). All from chat.
03 · KNOWLEDGE SYSTEM
A codebase that gets better, not worse.
400+ documented patterns and decisions that teach Claude Code how your project works. Not generic advice, but your conventions, your edge cases, your architecture. When you solve something with /learn, Claude remembers. When you /reflect, it synthesizes what the codebase has learned and suggests improvements. Run /health periodically to audit the architecture. It catches coupling issues, dead exports, and structural debt that accumulates quietly as you ship.
bug
/learn
lesson
/reflect
code updated
/learn
/reflect
bug
lesson
code updated
GETTING STARTED
Up and running in 3 steps
Clone. Connect. Build.
01
Clone the repo
Private GitHub access included with purchase. One command.
One command. Claude validates your environment, configures the project, connects your services, and verifies the build. Fully interactive, nothing to guess.
/setup
Prerequisites validated
Project configured
Environment ready
Supabase running
Build passing
All set. Want me to start the dev server?
Type a message…
03
Start building
Run /think to explore a feature idea. Drop in a PRD and /bootstrap turns it into a roadmap with GitHub issues. Or just tell Claude what to build. Pick whatever matches where you are.
Answered by Claude Code, directly from the codebase.
SaaS apps, dashboards, marketplaces, AI products, admin panels. Anything you’d build with Next.js. Internal tools and dashboards are a strong fit too: the auth system, RBAC, data tables, and form components handle data-dense interfaces well, and smaller user bases mean fewer edge cases to manage. The stack also supports marketing pages, landing pages, and docs sites alongside your app. You can ship as a web app, a PWA, or pair with Expo for mobile. Not a fit for: native iOS/Android apps, WordPress sites, or standalone Shopify storefronts. See one in the live demo.
Lifetime access to the full Sinter codebase via private GitHub repo. Auth, payments, email, security, CI/CD, a complete design system, 35 Claude Code slash commands, 15+ specialized agents, 20+ safety hooks, 6 service integrations via MCP, 400+ documented patterns, and AI-ready infrastructure with OWASP LLM Top 10 hardening. Plus all future updates for as long as Sinter is actively developed.
Free starters give you the skeleton. You still need auth edge cases, payment webhooks, testing infrastructure, CI/CD pipelines, security hardening, and a way for your AI tools to understand the codebase. That’s where your time and tokens go. Sinter includes 40+ quality gates across pre-commit, pre-push, and CI, 20+ safety hooks, and 400+ documented patterns that free starters don’t have. The gap between “it runs locally” and “it’s safe to go live” is what you’re paying for.
Yes. The infrastructure (auth, payments, testing, CI/CD, the design system, security hardening) works with any editor. The Claude Code slash commands, agents, and safety hooks are a bonus layer for Claude Code users. You’re getting a production-ready Next.js codebase either way.
Yes. One purchase, unlimited projects. Build your own SaaS, build for clients, build side projects. No per-project licensing.
Yes. Try the live demo, built with Sinter. The docs cover the architecture, conventions, and what every system does. The changelog shows what’s being worked on. This FAQ was generated by Claude Code from the codebase itself, which tells you something about the documentation depth.
Run /update in Claude Code. It fetches the latest changes from Sinter, groups them by PR, flags high-risk files (env config, migrations, tokens), previews conflicts before touching your code, and walks you through resolving them with smart per-file heuristics. Then it runs the build to make sure nothing broke. It turns what would be a stressful git merge into a guided conversation. Updates are pushed regularly for as long as Sinter is actively developed.
Great for building your first version. When the codebase starts fighting you (bugs multiply, context fragments, auth breaks in edge cases), Sinter is the foundation you build on next. Think of it as a graduation path, not a replacement.
Check the changelog. Updates are pushed regularly, and the knowledge system means the codebase gets better with every pattern you document. It’s not static code you’ll outgrow.
30+ GitHub Actions workflows. Type checking, linting, and tests on every PR. Security workflows include CodeQL, Gitleaks, dependency review, and axe accessibility audits. Structural checks include Knip (dead code), DPDM (circular imports), and enforced coverage thresholds. Every release includes CycloneDX + SPDX software bills of materials. Plus automated PR labeling, bundle-size monitoring, and AI-powered code review.
