Pricing

Unlimited everything. Pay per project.

No visitor caps. No MTU fees. No overage charges. When a test wins and your traffic climbs, your bill stays exactly where it was — you keep the upside.

Unlimited visitors

No MTU caps, ever

Unlimited tests

Run as many as you need

Flat-rate billing

Pay per project, not per visitor

MonthlyAnnualSave 20%
Limited time — 20% off all plans

Starter

20% off
$49$39/per month

For individuals and side projects

  • 1 project
  • Unlimited A/B tests
  • Unlimited visitors
  • Revenue tracking
  • Decision-ready reporting
  • Built-in anti-flicker
  • Email support
Get started
Most popular

Growth

20% off
$99$79/per month

For growing teams and businesses

  • 5 projects
  • Unlimited A/B tests
  • Unlimited visitors
  • Revenue tracking
  • Decision-ready reporting
  • Built-in anti-flicker
  • Email support
Start Growth trial

Scale

20% off
$189$149/per month

For large teams and agencies

  • Unlimited projects
  • Unlimited A/B tests
  • Unlimited visitors
  • Revenue tracking
  • Decision-ready reporting
  • Built-in anti-flicker
  • Priority support
Start Scale trial

Compare

See how Otter stacks up

Most A/B testing platforms charge on monthly tested users. The more traffic you get, the more you pay. We don't.

FeatureOtterMidaVWOOptimizelyAB TastyLaunchDarkly
Starting priceFrom $39/mo$199/mo+~$200/mo+Contact salesContact sales$12/mo + usage
Visitor / MTU limitsMonthly Tested Users — most platforms cap how many visitors can enter a test per month and charge overage fees.Unlimited100K–2M MTUMTU-basedMTU-basedMTU-based$10/1K MAU
A/B testsUnlimitedUnlimitedUnlimitedUnlimitedUnlimitedUnlimited
Revenue tracking
Visual editor
Split URL testing
Statistical engineAll plansAll plansAll plansAll plansAll plansAll plans
Anti-flicker solutionPrevents the page from visually "jumping" when a test variant loads. Some tools build this in; others require a manual snippet.Built-inManual snippetSmartCode optionManual snippetManual snippetN/A
Transparent pricingPublished pricing on the website — no "contact sales" required to see what you'll pay.
No per-seat fees
Billing modelPer projectPer MTUPer MTU + tierPer MTU + tierPer session + tierPer connection + MAU
Overage chargesExtra fees when you exceed your plan's visitor or usage cap.NeverYesYesYesYesYes

Competitor pricing data gathered from public sources as of March 2026. Actual pricing may vary — contact each vendor to confirm.

Questions

Frequently asked

If your question isn't here, email us — a person answers.

How much does A/B testing software cost?

It depends on how the tool meters you. Most established A/B testing tools price on monthly tracked users or visitors, so the bill grows with your traffic, and several (VWO, Optimizely and AB Tasty among them) don't publish prices at all and quote after a demo. Otter costs $39, $79 or $149 a month, priced per project, with unlimited visitors and unlimited tests on every plan. Our A/B testing tools guide lists what each major tool charges.

What's the difference between plans?

How many projects you can create, and your API rate limit. Starter includes 1 project, Growth includes 5, and Scale gives you unlimited projects; the API allows 100, 500 and 2,000 requests a minute respectively. Every plan includes unlimited tests, unlimited visitors, revenue tracking, and the full feature set.

Can I change plans anytime?

Yes. Upgrade or downgrade at any time from your billing settings. The new plan's limits apply as soon as the change goes through.

Is there a free trial?

Yes. Every new account starts with a 14-day trial with no credit card required. Trials run with the Starter plan's limit of one project.

Is there a free plan?

No. Otter has a 14-day free trial rather than a free plan. When a trial ends without a subscription, tests stop serving until you choose a plan.

Do you offer annual billing?

Yes. Annual billing saves you an additional 20% on top of any active promotions. Toggle to annual pricing above to see the discounted rates.

What counts as a project?

A project is a single website or domain you want to run A/B tests on. Each project gets its own API key, snippet, and test history.

Why don't you charge per visitor like everyone else?

Visitor-based pricing punishes growth. The more successful your site becomes, the more you pay, even if you're running the same tests. We think that's backwards. You should pay for what you use (projects), not be taxed on your traffic.

Is my data secure?

Data travels over HTTPS, and Otter is hosted in the EU, on dedicated servers in Finland. We never sell visitor data or share it between accounts. Visitor records don't store IP addresses: an IP is used to look up country and filter bots, and you can turn on IP masking per project. The SDK sets first-party cookies only, has a consent API, and offers an opt-in mode that stays dormant until a visitor agrees. Our Privacy Policy lists exactly what the SDK stores.

No surprises

Stop paying for visitors. Start paying for results.

14-day free trial. No credit card required. And when your tests start paying off, no MTU surprises on the invoice.

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  • No credit card required
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