PostHog vs GrowthBook: Which is Better in 2026?
Choosing between PostHog and GrowthBook comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: PostHog wins this matchup. Google Analytics is our overall Product Analytics pick. Google Analytics is our free Product Analytics pick. Pick GrowthBook if you need feature flags.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
PostHog
Open-source product analytics with event tracking, feature flags, and session recording
Best for you if:
- • You want open source
GrowthBook
Open-source feature flags and A/B testing
Best for you if:
- • You want warehouse-native approach means experiment data never leaves your infrastructure
| At a Glance | PostHog | GrowthBook |
|---|---|---|
Starts at | Free Free plan | Free Free plan |
Category | Product Analytics Web Analytics | Feature Flags A/B Testing |
Rating | 4.5/5 G2 4.5 1,054 reviews | 4.6/5 G2 4.6 26 reviews |
Free plan | Yes | Yes |
Watch out for | Overage fees for events beyond free tier | n/a |
Choose PostHog or GrowthBook?
Choose PostHog if
- You want open source
- You want all-in-one
- You work in product analytics, not feature flags
Choose GrowthBook if
- You want warehouse-native approach means experiment data never leaves your infrastructure
- You want generous free tier with unlimited flags, experiments, and traffic
- You work in feature flags, not product analytics
In-Depth Analysis
PostHog
Open-source product analytics with event tracking, feature flags, and session recording
PostHog's pricing is quite generous, especially with its robust free tier offering 1M events and unlimited seats.
Watch out
Overage fees for events beyond free tier
Strengths
- Pro: Open source
- Pro: All-in-one
- Pro: Self-hostable
Weaknesses
- Con: Complex setup
- Con: Can get expensive
Key features
GrowthBook
Open-source feature flags and A/B testing
GrowthBook offers a very generous Starter tier at $0/month for up to 3 users, making it highly accessible for small teams.
Strengths
- Pro: Warehouse-native approach means experiment data never leaves your infrastructure
- Pro: Generous free tier with unlimited flags, experiments, and traffic
- Pro: Open-source edition supports unlimited users at no cost
- Pro: Ultra-lightweight SDKs with local evaluation keep latency near zero
- Pro: Enterprise-grade statistics (CUPED, sequential, bandits) included in Pro plan
Weaknesses
- Con: Requires a data warehouse connection for experiment analysis, not plug-and-play
- Con: Free cloud plan limited to 3 users with no advanced statistics
- Con: Pro plan at $40/user/month can get expensive for large teams
- Con: Self-hosted deployment needs infrastructure expertise and ongoing maintenance
- Con: Visual editor and advanced testing features are only available on paid plans
Key features
Pricing: PostHog vs GrowthBook
| Plan | PostHog | GrowthBook |
|---|---|---|
| Tier 1 | Free Free | $0/month Starter (Cloud) |
| Tier 2 | Custom Usage-Based | $40/user/month Pro (Cloud) |
| Tier 3 | $750 Scale | Custom Enterprise (Cloud) |
| Tier 4 | N/A | $0 Open Source (Self-Hosted) |
Pricing verified from each vendor's public pricing page. Compare in detail on PostHog pricing and GrowthBook pricing.
Key Takeaways
PostHog
- Larger review base (1,054 reviews)
- Free tier available
- Our pick for this comparison
GrowthBook
- Higher user rating: 4.6/5 vs 4.5/5
- Better fit for feature flags
The Bottom Line
PostHog wins this matchup. Google Analytics is our overall Product Analytics pick. Google Analytics is our free Product Analytics pick.
Frequently Asked Questions
Is PostHog or GrowthBook better in 2026?
PostHog wins this matchup. Google Analytics is our overall Product Analytics pick. Google Analytics is our free Product Analytics pick. Pick PostHog for product analytics workflows (main strength: open source). Pick GrowthBook for feature flags workflows (main strength: warehouse-native approach means experiment data never leaves your infrastructure).
What are PostHog and GrowthBook used for?
PostHog: Open-source product analytics with event tracking, feature flags, and session recording. GrowthBook: Open-source feature flags and A/B testing.
What does PostHog cost vs GrowthBook?
PostHog's paid plans start at Free (Scale). GrowthBook's paid plans start at Free (Pro (Cloud)).
What's the main difference between PostHog and GrowthBook?
PostHog's main strength: open source. GrowthBook's main strength: warehouse-native approach means experiment data never leaves your infrastructure.