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.

VWO Alternative | Experiment Flow

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	<2KB	~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

10x Smaller SDK

VWO's SDK is ~150KB. Ours is under 2KB. 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. No credit card required.

Start Free Trial

Free forever with generous limits. Paid plans from $29/month.