What you get

Kumiko provides the common building blocks for a business app. Declare your features, then mount the built-in capabilities you need. They are included in the framework.

The core deal

Declare a feature, get the whole stack. One defineFeature() with an entity gives you a Postgres table, typed API, validation, access rules, search, and an admin UI with list, create, edit, and filter screens.

Kumiko-generated list screen: sortable columns, filter dropdowns, and status badges

Kumiko-generated edit form: typed fields, validation, and select options

Schema is the source of truth, change a field, and the table, API, forms, and labels follow. → Concepts: Schemas
Realtime is the default, changes stream to every open browser over SSE, and concurrent edits are safe (optimistic locking), not an add-on.
Audit comes built in, every write is an event; you get a full history and time-travel for free. → Concepts: Events
A reusable design system, generated screens plus a visual styleguide for primitives, widgets, forms, charts, drawers, tables, and dashboard panels.

Built-in features

These are pre-built features you mount in run-config.ts and configure : you don’t write them. Each links to its reference page.

Identity & access

Users, tenants, sessions, multi-tenant accounts, tenant switching, and session lifecycle. → user, sessions
Email + password auth, login, signup, password reset, email verification, and invites, all the screens included. → auth-email-password
Feature toggles & plan tiers, gate features per tenant, enforce plan limits and usage caps. → feature-toggles, tier-engine

Communication & files

Notifications, one ctx.notify(...) call delivers over email, push, and in-app, with templates, preferences, and a delivery log. → delivery
File storage, upload and serve files via S3 or local storage behind one API, with signed URLs. → files

Mail and PDF templates

Every mail and PDF comes from a template in the database. Admins change the text, logo, layout and attachments in the browser, check the result with sample values, send themselves a test mail and publish, all without a deploy. By default platform admins edit the templates; an app can unlock single templates for tenant admins, who then adapt them for their organization.

Mail template editor with the placeholder list, the mail body and its properties

Placeholders the feature declares, each with a type, label and sample value. A missing required placeholder blocks publishing.
Layouts and letterheads frame every mail and PDF with the tenant’s logo, colours and footer.
PDF templates for invoices and certificates, with repeating table rows, page numbers and the template version stamped into every PDF. A mail can attach one, generated when it is sent.
Several languages per template, with a fallback for missing ones. → Guide: Design mail and PDF templates, document-designer

Lists and tables

Every list screen can give its users a view menu, pinned columns, groups with server-side sums, a selection with bulk actions and an Excel export. Each part is one key in the screen’s table block; a list without it behaves as before.

Task list grouped by status with counts and sums per group and a total row

Columns, density, pinning, picked by the user in the view menu and kept for the browser session, with one Reset for everything.
Groups and totals computed on the server over the whole filtered list, with “Load more” per group.
Bulk actions that run a row action once per selected row through the same access checks and audit trail as a single click.
Export of the filtered list as .xlsx, without encrypted or sensitive fields. → Guide: Tables, what users can do, recipe

Operations

Background jobs, register a worker, get scheduled and event-triggered runs with a persisted run history and operator retry. → jobs
Rate limiting & audit, per-handler rate limits and an audit log for compliance reviews. → rate-limiting, audit
Config & secrets, per-tenant config keys and tenant-scoped encrypted secrets. → config, secrets

Compliance & billing

GDPR tooling, data export (Art. 20), erasure (Art. 17), retention, and region profiles, wired end to end. → user-data-rights, compliance-profiles
Subscriptions & billing, Stripe, Mollie and Paddle (merchant of record) behind one billing foundation. Customers choose between mounted providers at checkout. → subscription-stripe, subscription-mollie, subscription-paddle

An assistant that can use your app

Your feature definitions already describe the app, entities, handlers, screens, labels. agent-tools turns that registry into a tool catalog an LLM can call, so a chat layer can search, open and change records instead of only talking about them. Exposure is fail-closed: a handler without a description stays invisible to the model, and a write is proposed for approval rather than executed.

The assistant layer open next to the app, with an approval card for a proposed write

Make your app agent-ready, the one sentence per handler, agent.risk, the boot-time doc-gap check, and pre-seeded approval rules per tenant. → Guide: Make your app agent-ready
The chat surface itself is ai-agent, part of Kumiko Enterprise, with a runnable ai-agent-basic recipe.
What it looks like in a running app, the proposal card, permission rules, modes and caps, voice, and what it deliberately is not. → The Assistant: talk to your app

See it running

The capabilities above are easiest to grasp by running a real app:

Marketing demo, an asset tracker and a helpdesk on one instance: the generated CRUD UI in full.
ShowPony tutorial, build a guest-list app step by step.
UI walkthrough, auth, tenant switching, language and theme toggles.
Styleguide, the design-guild catalog for choosing and composing the UI building blocks.
publicstatus.eu, a full statuspage product built end to end on Kumiko, in production.

→ Ready to build your own? Quickstart, the starter includes a demo tasks UI out of the box. · Tutorial