How is this different from Google Optimize?

Google Optimize was sunset in 2023. Experiment Flow is a modern replacement with better multi-armed bandit support, faster setup, and more affordable pricing.

Do I need to install anything?

Just add one script tag to your site. No npm packages, no build steps, no dependencies.

How does statistical significance work?

We use two-proportion z-tests with 95% confidence intervals. Results only show as significant when there is less than 5% chance the difference is due to randomness.

Can I use this server-side?

Yes. The REST API works with any language. There are official SDKs for Node.js, Python, Go, and Ruby.

LaunchDarkly

LaunchDarkly Alternative

Feature flags + A/B testing in one simple tool.

Experiment Flow vs LaunchDarkly

Feature	Experiment Flow	LaunchDarkly
Starting Price	$0/mo	$10/seat + MAU fees
Feature Flags	✓ Yes	✓ Yes
A/B Testing	✓ (included)	Paid add-on
Statistical Significance	✓ Yes	✗ No
Multi-Armed Bandits	✓ Yes	✗ No
SDK Size	~5KB gzip	~30KB
No Cookies Option	✓ Yes	✓ Yes
Auto-promote Winner	✓ Yes	✗ No

Why Switch to Experiment Flow

Built-in Experimentation

LaunchDarkly's experimentation is an expensive add-on. Experiment Flow includes full A/B testing from day one.

Statistical Rigor

LaunchDarkly doesn't provide statistical significance. We give you p-values and confidence intervals.

Simpler Pricing

LaunchDarkly's pricing gets complex with MAUs and add-ons. We charge $29/seat, period.

Multi-Armed Bandits

Our Thompson Sampling implementation automatically optimizes traffic allocation.

Ready to Switch from LaunchDarkly?

Get started in 5 minutes.

Get Started

Plans from $29/month. Unlimited experiments included.