Kiavi Documentation

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Simple, secure authentication hosted in Europe. Drop in an SDK, redirect to a hosted login page, and you’re done.

New here? The quickstart walks you through a working integration in four steps. Want the mental model first? How Kiavi works covers the trust model, the two server modes, and how silent refresh works under the hood.

Working with an AI coding agent? After installing any Kiavi package, run its init command (e.g. npx kiavi-browser init) to drop the version-pinned integration guide into your repo so Cursor, Claude Code, and similar tools can read it.

Pick your SDK

@kiavi/kiavi-browser Browser client for any web app: React, Vue, Svelte, plain JS. PKCE, hosted-page redirects, silent refresh, email change flows.

@kiavi/kiavi-react-native Expo and bare React Native. Refresh tokens stored in the OS keychain via expo-secure-store. Same wire protocol as the browser SDK.

@kiavi/kiavi-js Server-side JWT verification for Node, Bun, Deno, and edge runtimes. Offline after the initial JWKS fetch.

Why Kiavi

Hosted in Europe

Data stays in the EU. Servers in Paris, run by a European company. No dependencies on Big Tech cloud providers.

Zero configuration

Pre-configured social logins, email codes, and passkeys. Redirect to a hosted page and let Kiavi handle the rest.

Isolated per app

Every app gets its own database and signing keys. No shared data across tenants.

Open source core

Built on battle-tested open source software used in production by top tech companies.

GDPR by design

Designed from the ground up for European privacy regulations. No dark patterns, no surprise data sharing.

Predictable pricing

€0.01 per monthly active user. No setup fees, no per-feature upcharges.