How do I turn a feature on for some users without releasing a new app version?

Use feature flags (beta). A flag is an on/off switch for a feature in your app or website that you flip in the Control Panel.

Create a flag:

1. Go to Audience → Feature Flags and click Create feature flag.
2. Enter the Key, for example new_checkout. Your developers read the flag by this exact key, and it can't be changed later.
3. Optionally add Properties, such as a button color, with a Default value.
4. Add Rules: each has a Segment (empty means all users), a Rollout, %, and optional property values. The first rule a device matches decides.
5. Click Save.

To roll out gradually, raise Rollout, % step by step; users who already have the flag keep it. If something goes wrong, click Kill switch to turn the flag off for everyone.

Before you start:

• Each application can have one flag that isn't archived. Contact your account manager to run more.
• Developers need Web SDK 3.94.1, Android SDK 6.16.0, or iOS SDK 7.2.10 or later and must read the flag in code.
• Creating and changing flags requires the Modify applications permission.

See who saw the feature: in the segment builder, the Feature flag condition with saw the feature (30 days) finds devices that reached the flagged feature. It works only if the app logs impressions.

Learn more: Feature flags