Optimizely vs Unleash

Quote on request

From $75 per seat/month (Pay-As-You-Go, 5-seat minimum self-hosted)

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

Self-hosted open source is genuinely free within its project and environment caps. Pay-As-You-Go includes 53M API requests a month with $5 per additional million; Enterprise is an annual custom contract adding SSO, audit and change requests.

No free tier.

Open-source edition is free and self-hosted with no seat limit, but capped at 1 project, 2 environments and 5,000 flags.

Widely used

Optimizely · since 2010

Widely used

Unleash / Bricks Software · 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.

• Local evaluation means no user data leaves your infrastructure — a strong GDPR position.
• Mature, well-documented open-source core with no artificial crippling.
• Kubernetes and Terraform support for infrastructure-as-code workflows.

• 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.

• Experimentation and analytics are thin; it is a flag system first.
• Self-hosting means you own uptime for something in your request path.
• Smaller ecosystem than LaunchDarkly.

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

Privacy-sensitive or cost-sensitive teams that want flags without sending user data to a vendor.