[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [local‑first/Auth](https://evolu.dev/docs/api-reference/common/local-first/Auth) › EvoluAppAuth

```ts
type EvoluAppAuth = InstantStartAuth | DeviceSecretAuth;
```

Defined in: [packages/common/src/local-first/Auth.ts:62](https://github.com/evoluhq/evolu/blob/aa223771feea747ffb1b0f5f3271574455633e37/packages/common/src/local-first/Auth.ts#L62)

How [createEvoluApp](https://evolu.dev/docs/api-reference/common/local-first/Evolu/functions/createEvoluApp) unlocks the app's device database, which keeps the
AppOwners the app can open on this device. Fixed per app, like
[EvoluConfig.appName](https://evolu.dev/docs/api-reference/common/local-first/Evolu/interfaces/EvoluConfig#appname): another one opens another device database.