Feature Flags.
Ship with conviction.

Evaluated in milliseconds.
Targeted, measurable, reversible rollouts.

Trivial to add.
Powerful to scale.

Official client libraries for Node.js, Go, and Python share the same REST contract—pick a language, pass your user context, and get the right variation in under 50 ms. Prefer shell scripts or another stack? curl works too.

First-class SDKs plus plain REST from any runtime
p95 evaluation under 50 milliseconds
Per-environment API keys keep dev, staging, and production isolated
Targeting by user id, email, organisation, IP, or audience

curl -X POST https://api.redpennon.dev/v1/variables/show-banner \
  -H "X-Api-Key: $RP_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"user": {"id": "user-123"}}'

Zero layout shift. Millisecond evaluation.

Traditional feature flags block rendering. RedPennon resolves flag state in milliseconds and delivers it before your application renders.

Rules propagate

When you flip a flag or update a rule, the change is live on the evaluation API immediately — no redeploy, no cache to bust.

Fast evaluation

The SDK evaluates user attributes against your rules via the evaluation API, with p95 response times under 50ms.

Instant delivery

The resolved state is injected into your app's payload. No client-side fetching, no loading spinners, no flickering.

Engineered for velocity.

Every feature you need to release safely, without the enterprise bloat.

Fast Evaluation

Flags are evaluated by a low-latency API, with p95 response times under 50ms.

Kill Switches

Instantly disable broken features across your entire infrastructure in milliseconds.

Targeting Rules

Target users by geography, subscription tier, email domain, or custom attributes.

Official multi-language SDKs

Node.js, Go, and Python clients ship from the same repo—typed helpers, shared behaviour, curl when you want zero dependencies.

Connect flags to the tools you already use.

Map flags to your code from CI, catch stale flags before they rot, and surface flag state directly in Jira.

Code References

See exactly where every flag is referenced in your code, linked to the line. The RedPennon CLI scans your repository in CI on each push—no repo connection or OAuth—so references stay current. Works with GitHub, GitLab, and Bitbucket.

Stale Feature Notifications

Find the flags that are safe to remove. RedPennon flags variables that have vanished from your code and ones that haven't been evaluated in weeks, then highlights the ones that are both—so you can clean up with confidence.

Jira Integration

Link feature flags to Jira issues and surface flag status and per-environment variations directly in the issue's Development panel. Install the RedPennon app from the Atlassian Marketplace, link it to your organisation, and updates push automatically on every flag or variation change.

Simple, predictable pricing.

Start free. Four plans, clear limits. Save up to 36% by paying yearly.

Free

1,000 MAUs

Basic

$25

10,000 MAUs

Business

$250

100,000 MAUs

Enterprise

$650

Unlimited

Compare all plans

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Feature Flags.Ship with conviction.

Trivial to add. Powerful to scale.