Feature Flags · decision tool

PostHog Feature Flags vs LaunchDarkly — for your app, not in general

PostHog Feature Flags or LaunchDarkly? Scored on documented capabilities for your requirements — the honest fit comparison, with "No clear winner" when they're genuinely close.

Capabilities verified 2026-07-17 against official documentation · fit weights are our estimates (see methodology) · share the URL to share your configuration

As of Jul 2026, for this page's default requirements, PostHog Feature Flags is the clear pick at 68% capability fit (LaunchDarkly: 51%). This is a capability-fit decision, not a price ranking — StackSays does not invent a unified dollar comparison across these tools' incompatible billing units. Change any requirement below and the verdict recomputes.

Your requirements

The verdict updates as you change these. Share the URL to share your answers.

Want open source / self-hostrun it yourself or keep the optionAvoid pricing that scales with usersno per-MAU bill that grows as you growWant flags + analytics togetherone tool for bothNeed A/B experimentationrun experiments on flagsNeed a usable free tierstart at $0 for a small productPrefer the simplest tooljust flags, minimal surface

Clear pick

PostHog Feature Flags (68% fit)

Ranked by capability fit

PostHog Feature Flags vs LaunchDarkly — the tradeoffs that decide it

Pricing-model scaling risk: PostHog Feature Flags — Flat / request / free pricing — doesn't scale the bill with your user count. LaunchDarkly — Bills per client MAU — the cost grows as your user base grows (documented).
Bundled analytics: PostHog Feature Flags — Bundles analytics you may not want. LaunchDarkly — Focused on flags.

When to pick LaunchDarkly instead: when the lines above where it leads matter more to you than the ones where PostHog Feature Flags leads. Change the inputs to see the ranking flip.

This is a capability-fit decision, not a price ranking — these tools bill in incompatible units (per-search vs per-RAM cluster vs per-PB scanned) and several publish rates only in their own calculators, so StackSays does not invent a unified dollar comparison. Every score above traces to a documented capability; see Data sources below.

At a glance

Tool	Deployment	Open source	Verified
PostHog Feature Flags	Self-hosted	Yes	2026-07-17
LaunchDarkly	Managed only	No	2026-07-17

Where did you land?anonymous, one click

Data sources

Tool	Source	Verified
PostHog Feature Flags	PostHog pricing (feature flags free tier)	2026-07-17
LaunchDarkly	LaunchDarkly pricing (official)	2026-07-17

A monitor re-checks these pages for changes; when a vendor moves a price, the date updates and every verdict recomputes.

Keep deciding

Compare head-to-head

Flagsmith vs Unleash — for your app, not in general →Flagsmith vs LaunchDarkly — for your app, not in general →Unleash vs LaunchDarkly — for your app, not in general →ConfigCat vs LaunchDarkly — for your app, not in general →ConfigCat vs Unleash — for your app, not in general →

Alternatives

Flagsmith alternatives — ranked for your stack →Unleash alternatives — ranked for your stack →ConfigCat alternatives — ranked for your stack →LaunchDarkly alternatives — ranked for your stack →

← All Which feature-flag tool should I use?Analytics & Observability channel →Developer Tools & CI/CD →