Features

A/B Testing Features Built for Speed and Accuracy

Split testing, decision-ready reporting, revenue tracking, Google Analytics goals, and zero-flicker rendering. From hypothesis to confident decisions, in one platform.

A/B Split Testing

Test any element on your page

Create unlimited variants with different headlines, images, CTAs, or entire layouts. Split traffic with precision. Our deterministic assignment algorithm ensures consistent experiences.

50% / 50%ASign UpBStart Free Trial
Decision Score84.7%Threshold 80%ThresholdControl61.2%Variant B84.7%

Statistical Engine

Know when results are real

Frequentist and Bayesian analysis with configurable thresholds, automatic multivariate adjustment, and real-time calculations.

$2k$4k$6k$8k$10kWeek 1Week 2Week 3Week 4Week 5Week 6$9.8kRevenue growing

Revenue Tracking

Measure the bottom line

Track purchases and revenue per variant. Welch's t-test for revenue comparisons. Know exactly how much each variant is worth.

Google Analytics Integration

Use your GA4 events as A/B test goals

Connect your Google Analytics 4 property and use any existing event as a conversion goal — no extra tracking code, no duplicate instrumentation. Most A/B testing tools force you to re-implement conversion tracking in their SDK. Otter A/B lets you keep the events you already trust and measure experiments against them directly.

  • Connect GA4 with one click via OAuth
  • Browse and select events from your property — no manual configuration
  • Combine GA4 goals with SDK-tracked goals in the same experiment
Decision Score84.7%Threshold 80%ThresholdControl61.2%Variant B84.7%

Zero-Flicker

No flash. No jank.

Cache-first rendering applies changes before the page is visible. 3-second failsafe. Anti-flicker snippet ensures zero visible layout shift.

0%5%10%15%thresholdControlVariant A+47%8.8%12.9%

Platform Support

Works with the stacks teams already run

Otter A/B ships as one lightweight runtime, but setup guides are tailored for the platforms and deployment workflows teams actually use.

Custom JavaScriptShopifyWordPressWebflowWixWooCommerceClickFunnelsSquarespaceFramerNext.jsGoogle Tag Manager
index.html123<script src="optimo.js" key="your_api_key" async></script>CopyHTMLLn 2, Col 18

Tiny SDK

< 9KB. Zero dependencies.

Async loading. No performance impact. Built from scratch — no bloated framework underneath.

Developer First

Built for engineers

REST API for server-side integrations. SDK methods for custom event tracking, user identification, and consent management. Full control over the testing lifecycle.

Start optimizing today

14-day free trial. No credit card required.