Learn about FlagSync’s client-side SDKs for web and mobile apps.
FlagSync’s client-side SDKs are designed for single-user contexts like web and mobile apps:
Need another language or framework? Contact FlagSync Support to explore adding it to our roadmap.
When using feature flags in web applications, rendering a page with default flag values before the SDK initializes can cause a “flicker” as content updates. To prevent this, consider these strategies:
display: none
, or use the waitForReady
prop in the React SDK) until the SDK signals readiness, then show the correct content.
SDK initialization time, usually 30-50 milliseconds, depends on flag count and ruleset complexity.
See Bootstrapping for details on providing initial flag values.
Get started with client-side SDKs: