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.

Enterprise Pricing

VWO Alternative

All the testing power. None of the bloat.

Experiment Flow vs VWO

Feature	Experiment Flow	VWO
Starting Price	$0/mo	$199/mo
A/B Testing	✓ Yes	✓ Yes
Multi-Armed Bandits	✓ Yes	✗ No
SDK Size	~5KB gzip	~150KB
Statistical Significance	✓ Yes	✓ Yes
No Cookies Option	✓ Yes	✗ No
Setup Time	5 minutes	Hours
Sales Call Required	✗ No	✓ (for higher tiers)

Why Switch to Experiment Flow

Much Smaller SDK

VWO's SDK is ~150KB. Ours is about 5KB gzipped. That's a massive difference for your page performance.

Better Price

VWO starts at $199/month. Experiment Flow starts free and scales to $29/seat for most teams.

Multi-Armed Bandits

VWO doesn't offer bandit testing. Our Thompson Sampling implementation finds winners faster.

No Visual Editor Lock-in

VWO pushes their visual editor which creates fragile tests. We encourage code-based tests that don't break.

Ready to Switch from VWO?

Get started in 5 minutes.

Get Started

Plans from $29/month. Unlimited experiments included.