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Notes from building Keel.

How the foundation is built, the decisions behind it, and what we learned wiring auth, billing, and teams together so you don't have to.

Engineering

Why we scoped every table by team_id from day one

Multi-tenancy is a schema decision, not a feature you bolt on later. Here's how Keel enforces it in every server action.

Jun 12, 2026 · 2 min

Engineering

Building Keel's AI credit system with the Vercel AI SDK

A credits balance, a usage_events log, and a Stripe top-up, the whole pattern, deducted on every streamed token.

Jun 9, 2026 · 2 min

Design

The 7 design rules behind Keel's visual identity

Most SaaS templates share the same gradient-blob, glassmorphism, Inter-everywhere look. We wrote down the rules to do the opposite.

Jun 5, 2026 · 2 min

Product

The boilerplate that explains your product, not just itself

Most starters ship a CLAUDE.md about the boilerplate. Keel ships a memory/ system that keeps explaining the product you build on top.

Jun 2, 2026 · 1 min