Best Free A/B Testing Tools 2026

The Reality of “Free” A/B Testing

Let's be honest: most tools that claim to be “free” actually offer a 14-day trial, then lock you out. A truly free A/B testing tool needs to meet these criteria:

• No time limit — Free means free forever, not “free for two weeks.”
• Actually functional — You can create, run, and analyze tests — not just view a dashboard.
• No credit card required — If they need your payment info to “start for free,” it's a trial.
• Reasonable limits — Some restrictions are fine (test count, features), but they shouldn't make the tool unusable.

With these criteria in mind, the landscape narrows significantly. Here are the tools that actually offer free A/B testing in 2026.

1. PageDuel — Best Value A/B Testing Tool

PageDuel was built specifically for small teams who need powerful A/B testing without enterprise pricing. Every plan includes the full product, and pricing starts from $9/mo:

• ✅ Unlimited experiments on every plan — Starter and Growth both ship the full A/B testing engine
• ✅ Usage-based pricing from $9/mo — price scales with your monthly events (10k events on the entry tier), not a per-visitor penalty
• ✅ Visual editor — make changes without writing code
• ✅ Revenue attribution — know exactly which test made you money
• ✅ Built-in analytics — conversion tracking and statistical significance
• ✅ No annual contract — month-to-month billing, or pay annually for 2 months free

Pricing: Two plans, both with unlimited experiments and revenue attribution. Starter from $9/mo (10k events) and Growth from $19/mo (10k events) — Growth adds 30 websites, 30 team members, longer data retention, and the AI variant generator. Price scales with your monthly event volume on both plans.

Best for: Startups, freelancers, and small businesses who want professional A/B testing at an affordable price. Every account starts with a 14-day free trial — no credit card required — so you can run real tests before you pay a cent.

2. Google Optimize — Discontinued (RIP)

Google Optimize was the go-to free A/B testing tool for years. It offered a visual editor, Google Analytics integration, and up to 5 simultaneous experiments — all for free. Unfortunately, Google shut it down in September 2023 and has not released a replacement.

If you're reading old blog posts recommending Google Optimize, they're outdated. The tool no longer exists. For the closest replacement, see our Google Optimize alternative comparison.

Status: ⚰️ Dead. Not coming back.

3. PostHog — Free Tier with Experimentation

PostHog is primarily a product analytics platform, but it includes A/B testing (called “Experiments”) in its free tier. It's developer-focused and requires coding to implement tests — there's no visual editor.

• ✅ Free tier includes experiments
• ✅ Feature flags for server-side testing
• ✅ Open source
• ❌ No visual editor — requires code for every test
• ❌ Complex setup — not beginner-friendly
• ❌ Primarily an analytics tool, not optimized for CRO
• ❌ Free tier limited to 1M events/month

Best for: Developer-led teams who already use PostHog for analytics and want to add basic experimentation without another tool.

4. Statsig — Free Tier for Feature Flags & Experiments

Statsig offers a generous free tier that includes A/B testing through feature flags. Like PostHog, it's developer-oriented and focuses on product experimentation rather than marketing page optimization.

• ✅ Free tier with experiments
• ✅ Strong statistical engine
• ✅ Feature flags included
• ❌ No visual editor
• ❌ Requires engineering resources to implement
• ❌ Better for product experiments than landing page tests
• ❌ Free tier limited to 10M events

Best for: Product teams running feature experiments in code, not marketers testing landing pages.

5. GrowthBook — Open Source A/B Testing

GrowthBook is an open-source experimentation platform that you can self-host for free. It's powerful but requires significant technical setup and maintenance.

• ✅ Completely free if self-hosted
• ✅ Open source — full control
• ✅ Bayesian and frequentist statistics
• ✅ SDK support for multiple languages
• ❌ No visual editor
• ❌ Requires self-hosting (server costs, maintenance)
• ❌ Complex setup — days, not minutes
• ❌ Cloud version starts at $75/month

Best for: Technical teams who want full control and are comfortable managing infrastructure. Not practical for most small businesses.

Tools That Are NOT Free (Despite Claims)

These tools are often listed as “free” in roundup articles, but they only offer time-limited trials:

• VWO — 14-day free trial, then $356+/month. Compare with PageDuel.
• Optimizely — No free tier. Starts at ~$79/month, enterprise plans at $36K+/year.
• Convert.com — 15-day trial, then $399+/month. Compare with PageDuel.
• AB Tasty — No free tier. Custom pricing starting ~$220/month.
• Personizely — Free trial only, then $39+/month with visitor caps. Compare with PageDuel.
• Shoplift — Free trial only, then $149+/month. Compare with PageDuel.

Free Tool Comparison Table

How to Get the Most from a Free A/B Testing Tool

Even with a limited free tier, you can drive significant results. Here are strategies to maximize your free plan:

1. Test your highest-traffic pages first. With limited test slots, focus on pages that get the most visitors. Your homepage, main landing page, or pricing page will produce results fastest.
2. Make bold changes. Small tweaks need large sample sizes to detect. On a free plan, test dramatically different headlines, layouts, or CTAs to find big wins quickly.
3. Use AI to generate variants. PageDuel's AI variant generator (on the Growth plan) creates professional copy alternatives in seconds. Don't spend hours writing — let AI give you a starting point.
4. Run one test at a time per page. Don't split your limited test slots across low-traffic pages. Concentrate your testing on what matters most.
5. Implement winners immediately. When a test reaches significance, implement the winner and free up the test slot for your next experiment.
6. Document everything. Keep a simple spreadsheet of what you tested, the hypothesis, and the result. This builds your optimization knowledge over time.

When to Move Up to Growth

The Starter plan already includes unlimited experiments, so you never hit a test cap. You move up to Growth when you need more scale or the extras. Signs it's time:

• You're managing more than one website (Growth includes 30)
• You need to invite teammates (Growth includes 30 seats vs 1 on Starter)
• You want the AI variant generator and priority support
• You need longer data retention (5+ years on Growth vs 3 on Starter)

With PageDuel, Growth starts at $19/mo and a single winning test typically pays for months of the subscription. Your price on either plan scales with your monthly event volume, so you only pay for the traffic you actually track. See our full pricing comparison for details.