PostHog A/B Testing
A/B test setup and ideation with PostHog Experiments, implemented via GTM or directly in your codebase. We review existing event data to inform test ideas, configure feature flags, set up exposure events, define success metrics, and validate consistent variant assignment.
PostHog A/B testing via GTM or in-code: event data reviewed for ideation, feature flags configured, exposure events set up, success metrics defined, experiments running.
Teams with PostHog already collecting data who want a structured way to run experiments, without guessing what to test or misreading results.
- 8-14 hours
- Event data reviewed before ideation, not only after
- Implemented via GTM or directly in your codebase
Depending on your existing setup, some steps below can be shortened or skipped entirely.
Delivery roadmapHow we deliver PostHog A/B Testing.
Data review and ideation
We review your existing PostHog data (pageviews, funnels, drop-offs) to identify where a test is worth running. Hypotheses come from observed behaviour, not assumptions.
Hypothesis and metric definition
Each test gets a defined hypothesis and a single success metric before any configuration starts.
Feature flag and variant setup
PostHog feature flags are configured via GTM or in your codebase with variant assignment logic, holdout groups, and correct rollout percentages.
Exposure event tracking
Exposure events are configured so PostHog records which users actually experienced each variant. Required for valid statistical analysis.
Results, iterate
We deliver a guide for reading results correctly. Once a test concludes, findings feed back into the next round of ideation.
Overview
How to know if you need PostHog A/B Testing
- You have PostHog collecting data but no structured process for using it to decide what to test.
- You have test ideas but no way to define hypotheses, assign variants, and track exposure events correctly.
- Previous tests produced unreliable results because exposure events were missing or variant assignment was inconsistent.
- You need to know when a test has reached a valid conclusion rather than calling it early.
What PostHog A/B Testing covers
- Existing PostHog event data reviewed to identify where tests are worth running before any ideation. Or events implementation to gather discovery data
- Test hypotheses defined with a specific success metric for each experiment.
- Results guide delivered so your team can read experiment data correctly and know when to call a test.
PostHog A/B Testing outcomes
- Experiments running with correct variant assignment, exposure tracking, and success metric events.
- A repeatable testing process grounded in PostHog data: ideate, implement, gather data, repeat.
PostHog A/B Testing scope and hours
- 8-14 hours.
- Traffic volume verified at scoping. We confirm statistical significance is achievable before setting up any test.
- GTM implementation: flicker may occur for visual changes since GTM fires after page load. We mitigate it where possible but cannot always eliminate it entirely.
- In-code implementation: no flicker.
What makes our PostHog A/B Testing setup different
- We start with your existing PostHog data before suggesting what to test. Ideation grounded in observed behaviour produces better hypotheses than starting from assumptions.
- Hypotheses are defined based on real data.
- Tracking implementation is verified to ensure events are collected as expected.
- Implementation is GTM or in-code based on your stack.
More PostHog services
View all PostHog servicesWant to try before you commit?
- Looking to try out Beluacode but not sure about it? You can always ask us for a free audit.
- Free, no strings attached. We deliver the results and wish you a great day.
- You will not be forced to talk to us, no call needed to release the results :)
Further reading on this topic.
Articles and guides related to this service.
Frequently Asked Questions
What is a PostHog feature flag?
What is an exposure event?
Does this have to go through GTM?
What is the GTM flicker issue?
How long do tests need to run?
Do I need PostHog already collecting data before this service?
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