Optimizely vs LaunchDarkly

Quote on request

From $12 per seat/month plus context-based usage (indicative)

Enterprise annual contracts, commonly in the tens of thousands and up. Priced by traffic and modules.

Priced on seats plus monthly contexts (roughly, unique users evaluated). High-traffic consumer products get expensive.

No free tier.

14-day trial; no permanent free tier.

Widely used

Optimizely · since 2010

Category standard

LaunchDarkly · since 2014

• The most capable visual editor for non-technical experiment authoring.
• Deep personalisation and audience-targeting features.
• Established statistics with sequential testing, so peeking is handled correctly.

• Extremely reliable flag delivery with offline fallbacks — this is infrastructure you can trust in the request path.
• Best-in-class governance: approval workflows, audit logs, role-based access.
• Code references and stale-flag detection actually help you remove dead flags.

• Expensive, with a suite-oriented sales motion that pushes adjacent products.
• Client-side testing causes flicker and is increasingly blocked by browsers and blockers.
• Heavyweight for teams that only need a handful of experiments.

• The most expensive option in the category by a distance.
• Experimentation is competent but less sophisticated than dedicated statistics platforms.
• No meaningful free tier for evaluation.

Large marketing organisations running continuous experimentation on high-traffic sites.

Engineering organisations where flags are critical infrastructure and governance is required.