---
title: Index
slug: feature-experimentation/docs/sdk-reference-guides
createdAt: 2026-08-05T20:39:56.000Z
---

![](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/BEBWWpAGxakdldwToF2Xa-20260723-144353.png)

The reference guides describe how to install, initialize, and use the Optimizely Feature Experimentation SDKs by language. Choose a language to learn more.

- [Android](docId\:FQEY5tFZQVPWAjGPjLBEX)
- [C#](docId\:esBzluZiGeopouGPklRfB)
- [Go](docId\:mOu3Q5aFTl5Q7_Ob1Ptpb)
- [Flutter](docId\:RjcdDlKorm2rsRDRgsb2z)
- [Java](docId\:NtFlX9bD9MUTgiIR90KqE)
- [JavaScript SDK v6+](docId\:Xg7P2ux5Cd5t461rYTc6o)
- [JavaScript (Browser)](docId\:Xg7P2ux5Cd5t461rYTc6o) – SDK versions 5.3.5 and below
- [JavaScript (Node)](docId:5-xFjwBwxerduQk4iUDN1) – SDK versions 5.3.5 and below
- [PHP](docId\:xgdjksBPaqq4GDsC8sBrI)
- [Python](docId\:YE3bxlNioCSgi3e4jefaq)
- [React](docId\:KehBY58fDT-m1LUq_lNh8)
- [React Native](docId\:KXNDhDlq6JsnWZ3Uwguc6)
- [Ruby](docId\:j-uje5XQgv6qQB1O1g6LO)
- [Swift](docId:1rMJsrxeNCRWNxAnybaYU)