Kitbase
Feature Management

What is Feature Flag?

A feature flag (also called a feature toggle) is a software development technique that lets you turn functionality on or off at runtime without changing code or redeploying your application. Feature flags decouple deployment from release, allowing you to ship code to production while controlling who sees it.

Feature flags enable several powerful workflows: gradual rollouts (releasing to 5% of users, then 20%, then 100%), canary releases (testing with internal users first), A/B testing (comparing variants), and kill switches (instantly disabling a broken feature).

At their simplest, feature flags are boolean values checked in your code. In practice, they can be targeted by user attributes (plan, geography, role), evaluated as percentages, or used to serve entirely different feature variants.

Example

You're launching a new dashboard redesign. Instead of a big-bang release, you use a feature flag to show it to 10% of users first, monitor error rates and feedback, then gradually increase to 100% over two weeks.

Code Example

javascript 
// Check a feature flag with Kitbase
const showNewDashboard = kitbase.isFeatureEnabled("new-dashboard");

if (showNewDashboard) {
  renderNewDashboard();
} else {
  renderLegacyDashboard();
}

Using a feature flag to conditionally render UI

Related Terms

Feature Toggle
Another name for a feature flag — a mechanism to turn features on or off without code changes.
Gradual Rollout
A release strategy where a feature is incrementally released to larger percentages of users over time.
Kill Switch
A feature flag used to instantly disable a feature in production without deploying new code.
A/B Testing
An experiment that compares two or more variants of a page or feature to determine which performs better.

Ship features with confidence

Use feature flags to control rollouts, run A/B tests, and instantly kill problematic features.

Explore Feature Flags