- Added a Lite bundle which does not include Data file manager and Event Processor packages. This reduces the bundle size up to 20% and is helpful for some platforms (such as edge service providers) that do not need extended functionality offered by these packages.

- Reduced SDK client initialization time by removing `OptimizelyConfig` creation from initialization. The `OptimizelyConfig` object is now created on the first call to `getOptimizelyConfig` API.
- Made Improvements to logging mechanism. The SDK now no longer concatenates and formats messages which do not qualify for the log level set by the user.

Javascript-SDK - 4.8.0-beta.2

Javascript-SDK - 4.8.0-beta

ai_cta

ai_identity

ai_chat

ai_product


Data set that refers to a person or a role and contains at least one address via which the person or role can receive messages.

recipient

Javascript-SDK - 4.6.2

feature-experimentation-release-notes

Release Notes for Feature Experimentation

2026 Optimizely Feature Experimentation release notes

2025 Optimizely Feature Experimentation release notes

2024 Optimizely Feature Experimentation release notes

2023 Optimizely Feature Experimentation release notes

2022 Optimizely Feature Experimentation release notes

Agent

Android SDK

C# SDK

Flutter SDK

Go SDK

Java SDK

JavaScript SDK

PHP SDK

Python SDK

React SDK

Ruby SDK

Swift SDK

Feature Experimentation SDK release notes

Release notes

Feature Experimentation API changelog – 2025

Javascript-SDK - 4.8.0-beta

[4.8.0-beta]

New Features

Performance Improvements