> For the complete documentation index, see [llms.txt](https://docs.hypertune.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hypertune.com/sdk-reference/local-synchronous-evaluation.md).

# Local, synchronous evaluation

SDKs evaluate flags locally, synchronously, in memory with no network latency. This includes flag logic that contains experiments.

So you can use an SDK on the backend to evaluate flags, including experiments, for different users without adding latency to every request.

And you can use an SDK on the frontend to evaluate flags, including experiments, without blocking renders.