### New Features:
- Introduced Decision notification listener to be able to record:
- Variation assignments for users activated in an experiment.
- Feature access for users.
- Feature variable value for users.

### Bug Fixes:
- Feature variable APIs return default variable value when featureEnabled property is false. ([#162](

### Deprecated:
- Activate notification listener is deprecated as of this release. Recommendation is to use the new Decision notification listener. Activate notification listener will be removed in the next major release.

Ruby-SDK - 3.1.1

Ruby-SDK - 3.1.0

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

Ruby-SDK - 2.1.1

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

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Java SDK

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Feature Experimentation SDK release notes

Release notes

Feature Experimentation API changelog – 2025