Percentage Rollouts
Gradually roll out features to 1%, 10%, 50% of traffic with precise decimal percentages.
Ship features
with confidence
Featrs gives your team hierarchical feature flags, percentage rollouts, audience segmentation, and time-based scheduling — all behind a simple API.
Feature Flags
Hierarchical flag management
Create flags with dot-notation keys and Featrs auto-builds the hierarchy.
Toggle platform to disable
everything beneath it, or fine-tune individual leaves. Track evaluations per flag in real time.
- Auto-created parent flags
- Percentage-based rollouts
- Scheduled activation & expiration
- Inline editing and deletion
| Flag | Status | Rollout | Evals |
|---|---|---|---|
| checkout | Enabled | 100% | 1,204 |
| checkout.new-flow | Enabled | 25% | 847 |
| checkout.express-pay | Disabled | — | 0 |
| platform | Enabled | 100% | 3,412 |
| platform.dark-mode | Enabled | 50% | 1,706 |
| Name | Rules |
|---|---|
| South Africa Enterprise | {"country":"ZA","plan":"enterprise"} |
| Beta Testers | {"beta":"true"} |
| EU Free Tier | {"region":["EU","UK"],"plan":"free"} |
| Internal Team | {"email_domain":"featrs.com"} |
Segmentation
Target the right audience
Define segments with JSON targeting rules — country, plan, custom attributes. Attach segments to flags so features only activate for users who match. Run experiments on specific cohorts without affecting everyone.
- Key-value rule matching
- Array values for multi-match
- Attach multiple segments per flag
- Context-aware evaluation API
Experiments
Data-driven decisions
Every flag evaluation is logged. See total evaluations, daily trends, and segment match rates. Know exactly how many users see each variant before promoting or killing a feature.
- Real-time evaluation tracking
- Per-flag statistics
- Batch evaluation for app init
- Segment match reporting
Experiment
checkout.new-flow
Total evals
4,832
Enabled
1,208
Segment hits
847
By segment
| Segment | Evals | Enabled | Rate |
|---|---|---|---|
| SA Enterprise | 612 | 153 | 25.0% |
| Beta Testers | 1,204 | 301 | 25.0% |
| EU Free Tier | 2,180 | 545 | 25.0% |
| No segment | 836 | 209 | 25.0% |
And everything else you need
Built for teams that move fast and ship safely.
Scheduled Activation
Set activation and expiration dates. Schedule launches or auto-disable seasonal features — no deploys.
API Keys & Scopes
Scoped API keys with optional expiration. Secrets hashed at rest — enterprise-grade security.
Multi-Organisation
Full tenant isolation. Users can belong to multiple orgs, each with its own flags, keys, and team.
REST API
Clean REST API with JWT auth. Evaluate flags, batch evaluate, and manage everything programmatically.
Coming soon
Client SDKs
Native SDKs for Rust, TypeScript, Python, and Go. Evaluate flags with one line of code.
Developer-first API
Integrate in minutes with a clean REST API and JWT authentication.
Create a flag
curl -X POST https://api.featrs.com/flag \
-H "Authorization: Bearer $TOKEN" \
-d '{
"key": "checkout.new-flow",
"value": true,
"percentage": 25
}'Evaluate with context
curl -X POST \
api.featrs.com/flag/evaluate \
-H "Authorization: Bearer $TOKEN" \
-d '{
"key": "checkout.new-flow",
"context": {
"country": "ZA"
}
}'
// Response
{"enabled": true}Ready to ship with confidence?
Create your organisation and start managing feature flags in under a minute.