LucernaShip features from your own stack.

SDKs for feature flags, kill switches, experiments and user identity — plus a small REST API for waitlists. Everything you need to build on Lucerna.

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Gates Quickstart

Waitlist API

🚦

Gates

Feature flags, kill switches and experiments with Node and browser SDKs — synchronous reads, zero network on the request path. Kills propagate in ten seconds.

Gates docs

🪪

Identity

One object answers “who is the current user?” for every SDK — and keeps your People profiles up to date by itself, fire-and-forget.

Identity docs

✉️

Waitlist

Capture one signup or a batch of 100 from your backend, and redeem invites from your own join flow. Three endpoints, no SDK required.

Waitlist API

🔑

Keys, not OAuth

A secret server key for backends, a publishable client key for browsers, or a scoped key with exactly the grants you choose. No OAuth dance.

How keys work

🛟

Fail-open by design

SDK reads never throw. A network blip answers with the last-known rules; an unknown gate answers safely — flags off, switches alive, variants null.

Evaluation semantics

🔒

Private by default

Pseudonymous user ids, PII encrypted at rest and always masked, a write-only browser key, and one call that erases a person everywhere.

Privacy & GDPR

Pick your entry point

SDK packages wherever one exists — the REST surface is only for what has no package.

@lucerna/gates-nodeNode & edge

Flags, kill switches and experiments on the server. Downloads your rules once, answers every check synchronously from memory.

pnpm add @lucerna/gates-node

@lucerna/gates-browserBrowser

Ready-made decisions in the UI with a publishable client key — plus React, Preact and Astro bindings. Rules never leave the server.

pnpm add @lucerna/gates-browser

@lucerna/identityUniversal

One answer to “who is the current user?” for every SDK. Keeps People up to date by itself — identify once, pass it everywhere.

pnpm add @lucerna/identity

Waitlist REST APIHTTP

The one surface you call over raw HTTPS — capture signups in batches and redeem invites from your own join flow. No SDK required.

POST /sdk/v1/waitlist/signup