 Subscribe to updates on this page using the notification and RSS feed options.  Updated the Optimizely Feature Experimentation API and the Optimizely Flags Scheduling API to support change approvals, cross-project holdouts, flag lifecycle management, and richer experiment and custom field details.

2026 API Feature Experimentation changelog

 Subscribe to updates on this page using the notification and RSS feed options.  Removed the /metrics endpoints from the Optimizely API .

2025 API Feature Experimentation changelog

Swift-SDK - 3.1.0-beta

API changelog

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

feature-experimentation-release-notes

Release Notes for Feature Experimentation

2026 Feature Experimentation release notes

2025 Feature Experimentation release notes

2024 Feature Experimentation release notes

2023 Feature Experimentation release notes

2022 Feature Experimentation release notes

Feature Experimentation release notes

Agent - 4.5.0

Agent - 4.4.0

Agent - 4.3.0

Agent - 4.2.2

Agent - 4.2.1

Agent - 4.2.0

Agent - 4.1.0

Agent - 4.0.0

Agent - 3.2.0

Agent - 3.1.0

Agent - 3.0.1

Agent - 3.0.0

Agent - 2.7.1

Agent - 2.7.0

Agent - 2.6.0

Agent - 2.5.0

Agent - 2.4.0

Agent - 2.3.1

Agent - 2.3.0

Agent - 2.2.0

Agent - 2.1.0

Agent - 2.0.0

Agent - 1.3.0

Agent - 2.0.0-beta

Agent - 1.2.0

Agent - 1.1.0

Agent - 1.0.2

Agent - 1.0.1

Agent - 1.0.0

Agent - 0.14.0

Agent - 0.13.0

Agent - 0.11.0

Agent - 0.12.0

Agent - 0.10.0

Agent - 0.9.0

Agent - 0.8.1

Agent - 0.8.0

Agent - 0.7.0

Agent - 0.6.0

Agent - 0.5.0

Agent - 0.4.0

Agent - 0.3.0

Agent - 0.2.0

Agent

Android-SDK - 5.4.0

Android-SDK - 5.3.0

Android-SDK - 5.2.1

Android-SDK - 5.2.0

Android-SDK - 5.1.1

Android-SDK - 5.1.0

Android-SDK - 5.0.1

Android-SDK - 5.0.0

Android-SDK - 4.1.0

Android-SDK - 4.0.4

Android-SDK - 4.0.3

Android-SDK - 4.0.2

Android-SDK - 4.0.1

Android-SDK - 4.0.0

Android-SDK - 3.13.4

Android-SDK - 3.13.3

Android-SDK - 3.13.2

Android-SDK - 3.13.1

Android-SDK - 3.13.0

Android-SDK - 3.12.0

Android-SDK - 3.11.1

Android-SDK - 3.11.0

Android-SDK - 3.10.2

Android-SDK - 3.10.1

Android-SDK - 3.10.0

Android-SDK - 3.9.0

Android-SDK - 3.7.0

Android-SDK - 3.8.0

Android-SDK - 3.6.0

Android-SDK - 3.5.2

Android-SDK - 3.5.1

Android-SDK - 3.5.0

Android-SDK - 3.4.0

Android-SDK - 3.1.2

Android-SDK - 3.3.0

Android-SDK - 3.2.0

Android-SDK - 3.2.1

Android-SDK - 3.1.1

Android-SDK - 3.1.0

Android-SDK - 3.0.1

Android-SDK - 3.0.0

Android-SDK - 2.1.4

Android-SDK - 2.1.3

Android-SDK - 3.0.0-RC2

Android-SDK - 3.0.0-RC

Android-SDK - 2.1.2

Android-SDK - 2.1.1

Android-SDK - 2.1.0

Android-SDK - 2.0.0-beta6

Android-SDK - 2.0.0-beta5

Android-SDK - 2.0.0-beta4

Android-SDK - 2.0.0-beta3

Android-SDK - 2.0.0-beta2

Android-SDK - 1.6.1 Release

Android-SDK - 2.0.0 Beta 1

Android-SDK - 1.6.0

Android-SDK - 1.5.1

Android-SDK - 1.5.0-RC

Android-SDK - 1.4.0

Android-SDK - 1.4.0-beta-RC2

Android-SDK - 1.4.0-beta-RC1

Android-SDK - 1.4.0-alpha-RC1

Android-SDK - 1.4.0-alpha

Android-SDK - 1.3.1

Android-SDK - 1.3.0

Android-SDK - 1.2.0

Android-SDK - 1.0.0

Android-SDK - 0.5.0

Android-SDK - 0.5.0-SNAPSHOT

Android-SDK - 0.4.1

Android-SDK - 0.4.0

Android-SDK - 0.3.0

Android-SDK - 0.2.2

Android-SDK - 0.2.1

Android-SDK - Android X 0.1.3

Android-SDK - 0.1.3 Beta

Android-SDK - 0.1.2-beta

Android SDK

CSharp-SDK - 4.5.0

CSharp-SDK - 4.4.0

CSharp-SDK - 4.3.0

CSharp-SDK - 4.2.0

CSharp-SDK - 4.1.0

CSharp-SDK - 4.0.0

CSharp-SDK - 3.11.4

CSharp-SDK - 3.11.3

CSharp-SDK - 3.11.2.1

CSharp-SDK - 3.11.2

CSharp-SDK - 3.11.1

CSharp-SDK - 3.11.0

CSharp-SDK - 3.10.0

CSharp-SDK - 3.9.1

CSharp-SDK - 3.9.0

CSharp-SDK - 3.8.0

CSharp-SDK - 3.7.1

CSharp-SDK - 3.7.0

CSharp-SDK - 3.6.0

CSharp-SDK - 3.5.0

CSharp-SDK - 3.4.1

CSharp-SDK - 3.4.0

CSharp-SDK - 3.3.0

CSharp-SDK - 3.2.0

CSharp-SDK - 3.1.0

CSharp-SDK - 3.1.1

CSharp-SDK - 3.0.0

CSharp-SDK - 2.2.2

CSharp-SDK - 2.2.1

CSharp-SDK - 2.2.0

CSharp-SDK - 2.1.0

CSharp-SDK - 2.0.1

CSharp-SDK - 2.0.0

CSharp-SDK - 2.0.0-beta1

CSharp-SDK - v1.3.1

CSharp-SDK - v1.2.1

CSharp-SDK - v1.2.0

CSharp-SDK - v1.1.1

CSharp-SDK - 1.1.0

C# SDK

Optimizely-Flutter-SDK - v3.7.0

Optimizely-Flutter-SDK - v3.6.0

Optimizely-Flutter-SDK - v3.4.3

Optimizely-Flutter-SDK - v3.4.2

Optimizely-Flutter-SDK - v3.4.1

Optimizely-Flutter-SDK - v3.4.0

Optimizely-Flutter-SDK - v3.3.0

Optimizely-Flutter-SDK - Releaes v3.2.0

Optimizely-Flutter-SDK - v3.1.0

Optimizely-Flutter-SDK - v3.0.1

Optimizely-Flutter-SDK - 3.0.0

Optimizely-Flutter-SDK - 2.0.1

Optimizely-Flutter-SDK - 2.0.0

Optimizely-Flutter-SDK - 1.0.1

Optimizely-Flutter-SDK - 1.0.1-beta

Optimizely-Flutter-SDK - 1.0.0-beta

Flutter SDK

Go-SDK - 2.6.0

Go-SDK - 2.5.0

Go SDK

SDK release notes