Stack & Ship · Solo founder tools

Help stop your AI agent shipping Supabase and Stripe bugs

Small, ready-to-use kits for indie hackers and solo founders. Each one comes with working proof and a plain list of what it doesn't do. One-off prices, no subscriptions.

See Ship-Ready AI Rules Read the blog

AGENTS.md rules, a verified Stripe webhook handler and 5 passing tests

Start free

Supabase + Stripe Security Checklist

20 checks for AI-built Next.js apps: RLS, service keys, webhook signatures. PDF, free.

Get the free checklist

Solo Founder OS Lite

Free Notion template: projects, tasks and subscriptions with renewal reminders. Works on Notion's free plan.

Get Lite free

Or open it straight in Notion.

Free security checker: 24 local checks for Next.js + Supabase + Stripe code. MIT, no account.

Guardrails Pack: help stop your AI coding agent leaking secrets or touching production. $24 (plus VAT where applicable).

Copilot Harness Port Kit: designed to help you keep chat on Local, move personal skills to folders the Copilot harness reads, and port your hooks. $12 (plus VAT where applicable).

Spend Caps Kit: per-user rate limits, a monthly AI spend cap in dollars, and a Stripe checkout refresh-loop guard for Next.js + Supabase apps. 52 tests, $19 one-off plus VAT where applicable. See what's inside →

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Kits

AI Rules · Next.js + Supabase + Stripe

Ship-Ready AI Rules

3 guardrail hooks, 18 Claude Code skills, and 6 subagents, plus Cursor rules and AGENTS.md, for Next.js, Supabase, and Stripe.

3 guardrail hooks · 18 Claude Code skills · 6 subagents · Cursor rules + AGENTS.md · demo app with hook tests

For developers using Cursor or Claude Code on Next.js, Supabase and Stripe.

v2 $19 one-off (plus VAT where applicable) · free for v1 owners · free sample on GitHub

See what's inside Ship-Ready AI Rules

Notion · Lite free / Pro $29 (plus VAT where applicable)

Solo Founder OS

A connected Notion workspace for solo founders: projects, tasks, revenue with MRR and VAT, expenses, subscriptions and profit per product.

Projects · tasks · revenue + MRR · expenses · subscriptions · profit per product

For solo founders who want MRR and profit per product without accounting software.

Free Lite · Pro $29 (plus VAT where applicable)

See the Solo Founder OS template

Spreadsheet · UK 2026/27

UK Sole Trader

Google Sheets and Excel tracker for UK sole traders: income, expenses, mileage, use of home, income tax and Class 4 NI estimates.

Income · SA103 expenses · mileage · use of home · tax + Class 4 NI estimate

For UK sole traders who want tidy 2026/27 records and a tax estimate.

£12 one-off

See the UK Sole Trader Tracker

Launch Audit · Next.js + Supabase + Stripe

Launch Audit

/audit scans your Next.js + Supabase + Stripe app with 28 checks, has an AI auditor with no Edit or Write tools review the hits, and is designed to write LAUNCH-AUDIT.md with suggested fixes.

/audit · 28 checks · LAUNCH-AUDIT.md · no Edit or Write tools

$12 (plus VAT where applicable)

See Launch Audit

Paid MCP Starter 1.2.0 · SDK v2 · spec 2026-07-28

Paid MCP Starter

A remote MCP server with API keys, a free tier, Stripe usage-based billing, rate limits, and a usage dashboard on Next.js + Supabase.

MCP SDK v2 · Streamable HTTP · Stripe Billing Meters · 72 local tests

$49 (plus VAT where applicable)

See Paid MCP Starter

Bundle · 3 products

Ship It Bundle

AI Rules v2, Launch Audit and Solo Founder OS Pro in one checkout for $39 (plus VAT where applicable).

AI Rules v2 · Launch Audit · Solo Founder OS Pro

$39 (plus VAT where applicable)

See Ship It Bundle

AI coding rules · v1.0

Stack Pack: Next.js + Drizzle + Better Auth + Polar

Rules, 6 skills, 3 Claude Code hooks, and a 20-check launch script for one stack.

Next.js 16 App Router · Drizzle on Postgres · Better Auth · Polar

$15 (plus VAT where applicable)

See what's inside →

Disclosure: this is our own paid product.

Bundle · Eight kits

AI Coding Toolkit: eight kits in one download

Hooks, rules, profiles, and runbooks designed to help keep your coding agent inside its limits, keep your task through a long session, and keep your setup working when a tool update changes something.

Works with Claude Code, Codex CLI, Cursor, or the VS Code Copilot harness, depending on the kit. Each kit is separate, so install one at a time. $49 (plus VAT where applicable).

See the AI Coding Toolkit

Other names belong to their owners. Names are used only to identify products and compatibility. Stack & Ship is not affiliated with or endorsed by any of them.

AI Coding Toolkit cover: a neat grid of eight tiles, each with a simple glyph and the short name of one kit.

Why Stack & Ship

Most developer kits sell a promise. We'd rather sell something you can run the same afternoon. Every Stack & Ship kit is small on purpose: it does one job for one kind of person, it ships with the proof that it works, and it says plainly where it stops. If you build and sell software on your own, your time goes on the product, not on setting up the tools around it. The AI rules exist because coding agents get Next.js, Supabase and Stripe apps running quickly but repeat the same security mistakes: the service key in a page, tables without row level security, webhooks that are never verified. The Notion system exists because one revenue total hides which product is working. The UK tracker exists because self assessment shouldn't need a spreadsheet you build from scratch every April.

Works out of the box.

Every kit ships with something you can run: a reference app that builds, tests that pass, a walkthrough.

Honest about limits.

Every product page has a "What this doesn't do" box, listing what has and hasn't been tested.

Fair, one-off prices.

Pay once on Gumroad. It's the merchant of record, so receipts and VAT are handled there.

From the blog

Fixes first, kits last. Guides on secure AI-assisted coding, Notion systems, and tool costs.

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