Otter vs Google Optimize

A Google Optimize alternative with the visual editor and GA4 goals

The free Google experimentation product retired in 2023. Looking for a Google Optimize alternative? Optimize is gone, so the practical question is which supported tool replaces it. Here is how Otter maps to what Optimize did, and where it differs.

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The short answer

Which should you pick?

Both tools run experiments. The choice comes down to how you want to be billed and how much platform you need.

Otter

Choose Otter if…

  • You want the Optimize workflow back: visual editor, A/B and redirect tests, personalizations
  • You want your GA4 conversion events to keep working as experiment goals
  • You want self-serve setup at a published price, not an enterprise contract

Google Optimize

Choose Google Optimize if…

  • Nobody should choose Google Optimize: it no longer exists. The comparison below shows what Otter restores and adds.

About Google Optimize

Google Optimize was a free visual A/B testing and personalization tool connected to Google Analytics. Google retired both Optimize and Optimize 360 on September 30, 2023: any experiments still active on that date simply ended, deployed personalizations reverted, and no data migration path was provided. Google has confirmed that A/B testing is not returning inside GA4.

Side by side

Feature comparison

FeatureOtterGoogle Optimize
AvailabilityAvailable nowDiscontinued September 30, 2023
PriceFrom $39/mo flat, unlimited visitorsWas free (Optimize 360 was paid)
Visual editorEnded with the product
A/B and A/B/n testingUnlimited concurrent testsHad a concurrent-test cap on the free tier
Split URL / redirect testingEnded with the product
Multivariate (factorial) testingA/B/n instead (no factorial)Had MVT (16-variation cap)
PersonalizationTargeted personalization test typeEnded with the product
GA4 events as goalsNative GA integration (retired)
Revenue trackingBuilt-in, with multi-currency conversion
Frequentist and Bayesian analysisManual split: frequentist or Bayesian; bandit: BayesianBayesian only
Auto-stop rules
REST API + MCP for AI agentsAll plans
Active support and updates

We make Otter, so we've kept to facts you can check. Google Optimize details come from Google's official sunset documentation, and details about other tools reflect public sources as of October 2026. Features change, so verify against current sources.

In detail

Where Otter and Google Optimize actually differ

What actually happened to Google Optimize

Google announced the sunset in January 2023 and shut Optimize down on September 30, 2023. It wasn't a soft landing: experiments still running on that date ended, personalizations deployed through Optimize reverted, historical results had to be downloaded before the deadline, and there was no export or migration tooling. Google pointed users to third-party A/B testing providers, naming AB Tasty, Optimizely and VWO as GA4 integration partners, and confirmed that native experimentation is not coming back to GA4.

That left a lot of teams (by third-party estimates, millions of sites used Optimize) choosing between enterprise-priced replacements and going without testing.

Otter as a Google Optimize alternative, feature by feature

Otter covers the workflow Optimize users actually had: a visual editor for building variants on the live page, A/B and A/B/n tests, redirect (split URL) tests, and personalizations. Otter has a dedicated content personalization test type that serves targeted content to visitor segments, which was one of Optimize's most-used capabilities.

Two differences matter. Optimize offered factorial multivariate testing (capped at 16 variations); Otter runs A/B/n tests with any number of variants but doesn't do factorial combinations. And Optimize was free, while Otter starts at $39/mo. What you get over free Optimize is unlimited concurrent tests (Optimize capped them), revenue tracking with multi-currency support, auto-stop rules, a REST API and MCP server, and a product that's actively maintained. Our pricing page lists every plan.

The GA4 connection, restored properly

The thing teams miss most about Optimize was that goals lived in Google Analytics. Otter restores that: existing GA4 conversion events can be used directly as experiment goals, so the conversions you already trust keep being the ones you test against. Otter can also forward experiment impressions and conversions into GA4 for analysis there.

Google's named partners, AB Tasty, Optimizely and VWO, connect to GA4 by sending experiment data into it and importing GA4 audiences for targeting, rather than scoring tests on your GA4 conversion events. Some other tools do use GA4 events as goals: Convert imports GA4 goals, and Crazy Egg can count GA4 events fired in the browser as conversions. Otter does it by reading the events from your GA4 reports.

Migrating from Optimize (or from nothing)

If you've been without testing since the sunset, migration is a fresh start: install Otter's snippet (one script tag with a one-line anti-flicker style the SDK removes automatically), rebuild your experiments in the visual editor or wizard, connect GA4 if you want GA4-event goals, and launch. Historical Optimize results can't be imported anywhere, because Google retired the data along with the product.

Statistically, Otter's manual-split experiments can use Bayesian chance-to-beat reporting or frequentist analysis at 80/90/95/99% confidence, with thresholds automatically adjusted for multi-variant tests. Multi-armed bandit experiments use Bayesian reporting automatically.

Verdict

The bottom line

Google Optimize is no longer available, so the practical decision is which supported tool replaces its visual experiments and Analytics-connected goals.

Otter covers the core migration path (visual editor, A/B/n and redirect tests, personalizations, GA4 event goals, revenue attribution and statistically sound reporting) and adds what free Optimize never had: unlimited concurrent tests, auto-stop rules, and API and MCP automation.

Unlike the enterprise replacements Google pointed to, Otter is self-serve with flat per-project pricing and unlimited visitors. To compare more options, see our guide to A/B testing tools.

Questions

Otter vs Google Optimize — common questions

What replaced Google Optimize?

Google ended Optimize on September 30, 2023 and pointed users to third-party tools, naming AB Tasty, Optimizely and VWO as GA4 integration partners. All three sell through sales without published prices. Otter is a self-serve replacement for teams that need visual A/B tests, split URL tests, personalizations, revenue tracking and GA4-connected goals.

Can I migrate Google Optimize experiments to Otter?

You can rebuild them, but not import them. Google provided no export or migration path when it retired Optimize, and historical results are gone unless you downloaded them before the sunset. In Otter: install the snippet, recreate each experiment and goal, verify the variants, then launch.

Does Otter integrate with Google Analytics 4?

Yes, in the direction that matters most for Optimize refugees: existing GA4 conversion events can be used directly as experiment goals. Otter can also forward experiment impressions, conversions and revenue into GA4 for analysis there. Using GA4 goals needs a GA4 connection and two custom dimensions registered in your property.

Does Otter have multivariate testing like Optimize did?

Not factorial MVT. Optimize supported multivariate tests with up to 16 variations; Otter runs A/B/n tests (one factor, any number of variants) with confidence thresholds automatically adjusted for the number of challengers. Most teams that used Optimize's MVT sparingly find A/B/n covers their real usage.

Will Google bring back Optimize or add testing to GA4?

Google has said no. GA4 has no built-in A/B testing, and Google confirmed Optimize's functionality is not being rebuilt inside GA4. GA4's role is analysis of experiments run by third-party tools, so testing tied to your GA4 data now needs a separate tool that connects to it.

Keep comparing

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