PostHog vs Heap for Product Analytics (2026)
PostHog and Heap take different approaches to product analytics. Heap automatically captures every user interaction without requiring manual instrumentation. PostHog is an open-source analytics platform that bundles session replay, feature flags, A/B testing, and surveys alongside analytics.
This comparison covers the key differences for product teams choosing between automatic event capture and an all-in-one open-source platform.
PostHog
PostHog is an open-source product analytics suite that includes event analytics, session replay, feature flags, A/B testing, and user surveys. It can be self-hosted for full data control or used as a cloud product.
Heap
Heap automatically captures every click, tap, and form submission without instrumentation. PMs can define events retroactively from captured data, which eliminates the "we forgot to track that" problem.
Feature comparison
| Feature | PostHog | Heap |
|---|---|---|
| Event instrumentation | Manual (autocapture option available) | Automatic (retroactive definition) |
| Session replay | Yes (included) | Yes (Heap Illuminate) |
| Feature flags | Yes (built-in) | No |
| A/B testing | Yes (built-in) | No |
| Self-hosting | Yes (open-source) | No |
| Free tier | Yes (1M events/mo) | Free (10,000 sessions/mo) |
| Paid plans | From $0 (usage-based), Teams from $450/mo | Growth and Enterprise (custom) |
PostHog pros
Open-source with self-hosting option
Feature flags and A/B testing included
Session replay bundled
Generous free tier (1M events/mo)
PostHog cons
Requires some instrumentation (unless autocapture)
Less polished UI than Heap
Self-hosting adds operational overhead
Smaller dataset than Heap for retroactive analysis
Pricing: Free (1M events/mo), Teams ($450/mo), Enterprise (custom)
Heap pros
Automatic capture of all events (no instrumentation)
Retroactive event definition
Clean, polished analytics UI
Strong funnel and path analysis
Heap cons
No feature flags or A/B testing
No self-hosting option
Can generate noisy data from automatic capture
Enterprise pricing with no transparent plans
Pricing: Free (10,000 sessions/mo), Growth and Enterprise (custom pricing)
Choose PostHog if you need
- - You want feature flags and A/B testing alongside analytics
- - Self-hosting for data sovereignty is required
- - Open-source and community support matter
- - You want session replay bundled at no extra cost
Choose Heap if you need
- - You cannot invest in manual event instrumentation
- - Retroactive event definition is critical for your team
- - You want automatic capture as a safety net
- - Your analytics team prefers a polished, purpose-built UI
How Vantage fits in
Vantage connects to analytics context to ground PRD generation in real user data. PostHog exports and Heap reports can be imported as context sources in Vantage projects, ensuring your specs reflect actual usage patterns rather than assumptions.
Frequently asked questions
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