Google Optimize was the go-to free A/B testing tool for millions of marketers. Then Google killed it in September 2023 with barely six months' notice. If you're still looking for a replacement — or unhappy with the one you picked — this guide ranks the best alternatives based on real usage, not affiliate commissions.
What Happened to Google Optimize?
On September 30, 2023, Google officially sunset both Google Optimize and Google Optimize 360. All running experiments stopped and the product was removed entirely. Google's stated reason: "invest in solutions that are more effective for our customers."
The real story: Google couldn't justify rebuilding Optimize for GA4 when the free tier generated zero revenue and Optimize 360 couldn't compete with Optimizely or VWO. The product had fundamental limitations — severe page flicker, client-side-only execution, and an artificial 5-experiment cap.
The good news
The market has matured significantly since the shutdown. There are better options at every price point — including free tiers that exceed what Google Optimize ever offered.
Why Google Optimize Was So Popular
Free with no catch
Up to 5 concurrent experiments at zero cost — enough for small teams to run a real testing program.
Native Google Analytics integration
Goals and audiences flowed directly from GA. If you used Google Analytics, setup was trivial.
Visual editor for non-developers
Marketers could change headlines, buttons, and images without writing code.
Top 5 Google Optimize Alternatives in 2026
Ranked by setup time, performance impact, statistical rigor, and total cost.
#1 ExperimentHQ — Free, Lightweight, Privacy-First
Built specifically for the post-Google Optimize world. Addresses every weakness while keeping the simplicity that made Optimize popular.
Best for: Startups, SaaS, developer-led growth teams, anyone who cares about site speed.
#2 LaunchDarkly — Enterprise Feature Flags
Primarily a feature flag platform with experimentation bolted on. Excellent if your engineering team needs feature management first and A/B testing second. Industry-leading SDK ecosystem across 25+ languages with SOC2, HIPAA, and RBAC compliance.
Downsides: Experimentation is a bolt-on. No free tier for testing. Starts at $8.33/seat/month and scales aggressively.
#3 Optimizely — Full-Stack Experimentation
The legacy enterprise leader. Most comprehensive platform — web, server-side, mobile, OTT — with advanced stats (sequential testing, multi-armed bandits, Stats Engine). Built for Fortune 500 CRO teams.
Downsides: Script is 60-100KB+ causing CLS. Pricing starts at $50,000+/year. Requires professional services. Overkill for teams under 50.
#4 VWO — Visual Editor + Testing
Closest to Google Optimize in workflow. Best-in-class visual editor for marketing teams. Includes heatmaps, session recordings, and Bayesian statistics (SmartStats).
Downsides: Script is 80KB+ with flicker on complex pages. Server-side is a separate product. Starts ~$200/month with confusing tiers.
#5 AB Tasty — Personalization + Testing
French-headquartered platform combining A/B testing with AI-powered personalization. Strong GDPR positioning with EU-hosted data. Best for EU enterprises with strict data residency requirements.
Downsides: Custom pricing only (~$800+/month). Script weighs 90KB+. No free tier or self-serve signup.
Feature Comparison Table
| Feature | ExperimentHQ | LaunchDarkly | Optimizely | VWO | AB Tasty |
|---|---|---|---|---|---|
| Free Tier | Yes (forever) | Dev only | No | Trial only | No |
| Script Size | <5KB | ~20KB | 60-100KB | 80KB+ | 90KB+ |
| Flicker-Free | Yes | Yes (server) | Partial | No | Partial |
| Visual Editor | Yes | Limited | Yes | Best-in-class | Yes |
| Feature Flags | Included | Core product | Add-on | No | Limited |
| Server-Side | Yes | Yes | Yes | Separate | Yes |
| GDPR | No cookies | Compliant | Compliant | Compliant | EU-hosted |
| Starting Price | Free | $8.33/seat/mo | $50K+/yr | ~$200/mo | ~$800/mo |
Migration Guide from Google Optimize
Many sites still have dead Google Optimize code loading on every page. Here is how to clean up and migrate in under an hour:
Remove the anti-flicker snippet
Search for dataLayer.hide or .async-hide. Deleting this alone recovers 200-400ms of page load time.
Remove the Optimize container script
Delete the optimize.js script tag and any GTM triggers. Remove the OPT-XXXXXXX container ID.
Document your past test results
Export winning test data from GA reports. Build a spreadsheet: page, hypothesis, winner, lift.
Add your new tool's snippet
For ExperimentHQ, one async script tag. Verify in DevTools, then recreate your top experiments.
Migration snippet
<!-- REMOVE: anti-flicker -->
<!-- <style>.async-hide{opacity:0!important}</style> -->
<!-- REMOVE: Optimize container -->
<!-- <script src="https://www.googleoptimize.com/optimize.js?id=OPT-XXXXX"></script> -->
<!-- ADD: ExperimentHQ (under 5KB, async, no flicker) -->
<script src="https://cdn.experimenthq.io/ehq.js" data-key="YOUR_KEY" async></script>Start Testing Today
Google Optimize's shutdown was jarring, but the tools that replaced it are genuinely better — lighter scripts, no flicker, real statistics, and free tiers that scale. Pick your highest-traffic page, form a hypothesis, and run your first experiment this week.
Replace Google Optimize Today
ExperimentHQ picks up where Google Optimize left off — without the flicker, the limits, or the performance penalty.
Get Started Free