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Kumiko
TypeScript backend framework for multi-tenant business apps
Kumiko is an open-source (MIT) backend framework for business software. You describe the domain in TypeScript, and tenant scoping, auth and roles, an audit trail, realtime updates and a schema-driven UI follow from it. It runs on Bun and Postgres, and you can host it yourself. The npm package ships an AGENTS.md, so coding agents can work from the installed docs. PublicStatus, Offlot and CashColt run on it in production.
Hi Product Hunt! We kept rebuilding the same backend parts for every business app: tenants, sign-in, roles, an audit log, realtime updates. Kumiko puts those parts in one framework. You declare entities, access rules and screens in one feature definition, and the tables, handlers, validation and CRUD UI come from it.
Today it's pre-1.0, MIT licensed and at version 0.418 on npm. `bun create kumiko-app my-app` gives you a working app with a demo feature, and the Show Pony tutorial walks through a multi-tenant RSVP app: https://docs.kumiko.rocks/en/show-pony/
The apps running on it so far are our own, so you'll likely hit problems we haven't. If you've built multi-tenant software, which part did you end up rebuilding that a framework should have handled?
About Kumiko on Product Hunt
“TypeScript backend framework for multi-tenant business apps”
Kumiko was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #180 on the daily leaderboard. Kumiko is an open-source (MIT) backend framework for business software. You describe the domain in TypeScript, and tenant scoping, auth and roles, an audit trail, realtime updates and a schema-driven UI follow from it. It runs on Bun and Postgres, and you can host it yourself. The npm package ships an AGENTS.md, so coding agents can work from the installed docs. PublicStatus, Offlot and CashColt run on it in production.
On the analytics side, Kumiko competes within Open Source, SaaS, Developer Tools and GitHub — topics that collectively have 678.6k followers on Product Hunt. The dashboard above tracks how Kumiko performed against the three products that launched closest to it on the same day.
Who hunted Kumiko?
Kumiko was hunted by Marc Frost. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Kumiko including community comment highlights and product details, visit the product overview.
Marc Frost
Hi Product Hunt! We kept rebuilding the same backend parts for every business app: tenants, sign-in, roles, an audit log, realtime updates. Kumiko puts those parts in one framework. You declare entities, access rules and screens in one feature definition, and the tables, handlers, validation and CRUD UI come from it.
Today it's pre-1.0, MIT licensed and at version 0.418 on npm. `bun create kumiko-app my-app` gives you a working app with a demo feature, and the Show Pony tutorial walks through a multi-tenant RSVP app: https://docs.kumiko.rocks/en/show-pony/
APIs can still change between minor versions. Each breaking change ships a migration note, and `bunx kumiko-upgrade --apply` runs the codemods. The docs have gaps too: we gave a fresh coding agent only the npm package and four tasks, and it passed all our hidden acceptance tests, but every task ran into something the docs didn't explain. Writeup: https://dev.to/marc_kumiko/a-fresh-coding-agent-passed-all-four-tasks-against-our-framework-docs-heres-what-that-result-4l58
The apps running on it so far are our own, so you'll likely hit problems we haven't. If you've built multi-tenant software, which part did you end up rebuilding that a framework should have handled?