66IDEAS publishes open-source software specifications - complete, buildable definitions of functionality, UX, and architecture - together with working reference implementations that prove each one.
Everybody can ask an agent to build software today. What is scarce is the idea - and the thought-through design behind truly great products. That is what you find here: the specification is the product; the code is the proof.
Functionality, UX, and architecture - complete enough that a human team or an AI agent can build the product from it.
Working software built from the spec - on whatever stack proves the point. Specs without proof are wishes.
Build it your way. Take a specification and implement it against your own technology stack - Google Firebase, SAP BTP, Microsoft Azure, or anything else. Or skip the build and run a reference implementation as-is. Everything is MIT-licensed and free.
Every product is a pair: the specification, and the reference implementations built from it. The number in the name is the idea's number.
A complete CRM - sales, service, deal rooms, AI briefings, gamification - fully specified, with four implementations on completely different stacks. Try the live demo in your browser.
A native, read-only Markdown reader for macOS 26 - rich rendering, outline, search, bookmarks, themes, and publication-quality HTML and PDF export. Fully specified, Swift implementation.
More ideas are queued. Each one ships when it is finished, not before.
Deploy or install a reference implementation. Done.
Hand the specification to your team - or your AI agent - and implement it on the stack you already trust.
Issues are welcome everywhere; pull requests are welcome on the specifications. The reference implementations follow the specs. No CLA, no paperwork.
Design decisions, spec deep-dives, and what building with AI agents actually looks like.
What changes when implementation stops being the scarce resource.
Three CRM systems, two decades - the story behind the name.
Five lessons on what a spec needs so an agent can build from it.