Tutorials and guides

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How to run experiments with feature flags

For more experiment tutorials, check the A/B testing docs!

Framework guides

Best practices

Learn more about feature flags best practices from our blogs below:


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Server-side local evaluation

Note: Local evaluation is only available in the Node , Ruby , Go , Python , and PHP SDKs. Note: Do not use local evaluation in an edge / lambda environment, as this can slow down performance, and also raise your bill drastically. It's best to use regular flag evaluation instead. Evaluating feature flags requires making a request to PostHog for each flag. However, you can improve performance by evaluating flags locally. Instead of making a request for each flag, PostHog will periodically…

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