Reference · Progressive delivery · Release safety
Feature flags, explained for builders
This site collects practical, vendor-neutral explainers you can share with a team — from first principles to rollout discipline. It is maintained by Featureflow, but you do not need their product to use the material here.
Feature flag guide
One guide in multiple parts — start with the overview or jump to a section. The same pages are listed under Feature flag guide in the header.
Overview
Definitions, common patterns, lifecycle discipline, and how the rest of the guide fits together.
Open →Feature flag use cases
Progressive exposure, emergency shutoff, ops modes, entitlements, experiments, and migration-shaped problems.
Open →Feature flag best practices
Lifecycle discipline, testing, ownership, and observability — with Martin Fowler’s feature toggles article as foundational context.
Open →Feature flags vs branching
Trunk-based habits, short-lived branches for review, and what flags change after code integrates.
Open →Implementing feature flags
Where to evaluate rules, propagation delay, failure defaults, consistency, and auditable configuration.
Open →Build vs buy feature flags
In-house toggles vs managed platforms: capacity, compliance, portability, and total cost of ownership.
Open →
Libraries & links
Standards, SDK entry points, and Featureflow open-source clients when you are ready to integrate.
Libraries and links
OpenFeature and official SDK entry points across popular languages, plus Featureflow repos and docs.
Open →Prefer a hosted flag platform?
Featureflow is one option if you want targeting, real-time updates, and governance in one place. The guides on this site remain useful regardless of which tool (if any) you choose.