---
title: Legacy Server SDKs
description: "Statsig's long-lived Server SDKs, which are transitioning to the Server Core framework"
product: general
token_estimate: 305
---
# Legacy Server SDKs

> For AI agents: a documentation index is available at [/llms.txt](/llms.txt). Append `.md` to any page URL for markdown, or send `Accept: text/markdown`.

Statsig is transitioning to the Statsig Server Core architecture, which unifies all Server SDKs around a performance-optimized core package. Server Core delivers improved performance and greater feature consistency. Most customers continue to use legacy SDKs, which remain supported except for major feature additions.

## Timelines

Statsig has announced end-of-life dates for some Legacy Server SDKs. [Server Core SDKs](https://docs.statsig.com/server-core) often evaluate 5-10x faster than legacy SDKs and are more feature complete. Go to the docs for existing SDKs below:

- [Node](https://docs.statsig.com/server/nodejsServerSDK)
- [Python](https://docs.statsig.com/server/pythonSDK)
- [Elixir/Erlang](https://docs.statsig.com/server/erlang) (End of Life April 30th, 2026)
- [Java](https://docs.statsig.com/server/java)
- [Rust](https://docs.statsig.com/server/rust) (End of Life April 30th, 2026)
- [Go](https://docs.statsig.com/server/go)
- [PHP](https://docs.statsig.com/server/php)
- [.NET](https://docs.statsig.com/server/dotnet)