Outtest vs PostHog Experiments
PostHog Experiments is built for product engineers. Every experiment runs on a PostHog feature flag, results come from events you already track, and you can pull in Stripe data through PostHog's data warehouse. Your team decides what to test, writes the variant code or uses the beta no-code editor, and reads the results.
Outtest works one level up. Its AI agents read your analytics and payment data, find the page that leaks the most money, write the new version, run the test and call the winner on revenue per visitor from your payment tool, without anyone writing flag code. It focuses on landing pages, pricing, trials, cancel flows, Meta ads and SEO, and costs from $29 a month for 3 tests. Outtest can use PostHog as one of its analytics sources. It's new, while PostHog has been shipping since 2020.
At a glance
| Outtest | PostHog Experiments | |
|---|---|---|
| Best for | Founders and small teams who want tests run for them and judged on real revenue, without a CRO specialist. | Product engineers and startups already sending events to PostHog who want experiments on the same data, often inside the free tier. |
| Price | From $29/month (3 tests a month). 20% off yearly. | Free every month up to 1M feature flag requests and 1M analytics events, and experiments are billed as flag requests. Above that, flag requests start at $0.0001 each and get cheaper with volume. Pay-as-you-go has no platform fee. |
| Free plan or trial | No free plan or trial | Free plan |
| AI builds the test versions | Yes | Partly |
| Judges tests on revenue from your payment tool | Yes | Partly |
| Visual editor | No | Partly |
| Server-side tests | Partly | Yes |
| Stats engine | Bayesian, on revenue per visitor | Both (Bayesian and frequentist engines, with CUPED) |
| Payment integrations | Stripe, Shopify, Polar, Whop, Paddle, Lemon Squeezy, Gumroad, Dodo Payments, Creem, RevenueCat, Chargebee | Stripe |
Pick PostHog Experiments if
- You already use PostHog for analytics and want experiments on the same data.
- Your tests live inside your product and your engineers are happy to add flag checks.
- Your usage fits the free tier of 1M flag requests and 1M events a month.
- You want analytics, funnels, session replay and experiments in one tool.
- You want to choose Bayesian or frequentist results and use CUPED.
Pick Outtest if
- You want tests planned, built, run and called by AI agents, not set up by engineers.
- You want every test judged on revenue per visitor out of the box, without warehouse joins.
- Your tests are on the marketing site, pricing page, trial offer, cancel flow or Meta ads.
- You want a flat price per test instead of metered requests and events.
The verdict
If you already live in PostHog and your engineers run product experiments, PostHog Experiments is the cheap default, and PostHog says 97% of companies use it for free. If you want tests on your marketing and pricing surfaces run for you and judged on revenue from your payment tool, Outtest fits better, and it can read your PostHog data while it does. Plenty of teams could run both.
Questions people ask
How much does PostHog Experiments cost?+
Experiments are billed with feature flags. The first 1M flag requests each month are free, then $0.0001 per request up to 2M, getting cheaper with volume. Exposure and goal events count as analytics events, which are free up to 1M a month.
Is PostHog Experiments Bayesian or frequentist?+
PostHog offers both engines. The Bayesian engine reports the probability that a variant beats control, and you can turn on CUPED to reduce noise.
Can PostHog run no-code A/B tests?+
Yes, in beta. You build web experiments in the PostHog toolbar by editing text, CSS or HTML. PostHog says they suit simple changes and server-rendered sites, and that React, Vue or Angular apps can overwrite the changes.
Can PostHog judge an experiment on Stripe revenue?+
Yes, with setup. You connect Stripe as a data warehouse source, then add a data warehouse metric with join keys that link Stripe customers to PostHog users. Outtest judges every test on revenue per visitor from Stripe and other payment tools without that setup.
Does PostHog have a free trial?+
No, because the free tier covers every product each month with no card. You add a card when you need more than the free limits, more projects or the paid add-ons.
Sources
Checked on 28 September 2026 from PostHog Experiments's own pages. Prices and features change; check PostHog Experiments's site before you buy.
- posthog.com/pricing
- billing.posthog.com/api/products-v2?plan=standard
- posthog.com/experiments
- posthog.com/docs/experiments
- posthog.com/docs/experiments/statistics
- posthog.com/docs/experiments/statistics-frequentist
- posthog.com/docs/experiments/no-code-web-experiments
- posthog.com/docs/experiments/data-warehouse
- posthog.com/docs/experiments/analyze-experiments-ai
- posthog.com/docs/experiments/create-experiments-mcp
- posthog.com/docs/revenue-analytics/payment-platforms/stripe
- posthog.com/docs/revenue-analytics/start-here
- posthog.com/docs/feature-flags/cutting-costs
- posthog.com/about
Let Outtest run your split tests
AI agents read your analytics and payments, find where you lose the most money, build the fix and test it. Every test is judged on revenue, not clicks. Plans from $29 a month.