Head to head
PostHog vs Statsig
As a feature flag API, Statsig rates higher on the APIbenchmarks Index, 86.3 to 85.3, a 1-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | PostHog | Statsig |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 85.3 | 86.3 |
Specifications
| PostHog | Statsig | |
|---|---|---|
| Best for | All-in-one product analytics with built-in flags | Flags + experimentation + product analytics |
| Free tier | First 1M flag-eval requests/mo free, no credit card | Free: unlimited flag checks + 2M metered events/mo, up to ~1M MTUs |
| Pricing | Per request (volume-tiered) | Per metered event / MTU-based |
| Official SDKs | 12 languages | 12 languages |
Is PostHog better than Statsig?
On the APIbenchmarks Index, Statsig rates higher (86.3 vs 85.3). It leads on the four weighted criteria, but price is reported separately, so the best choice still depends on your budget.
Verdict in one line
Statsig leads by 1 points (86.3 vs 85.3) and wins 2 of 4 criteria; PostHog wins 2.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 88 | 86 | |
| Reliability | 82 | 85 | |
| Ecosystem & SDKs | 80 | 85 | |
| Accessibility | 92 | 90 |
Choose PostHog if… / choose Statsig if…
- →documentation & dx matters most to you (88 vs 86)
- →accessibility matters most to you (92 vs 90)
- →your use case matches its focus: all-in-one product analytics with built-in flags
- →reliability matters most to you (85 vs 82)
- →ecosystem & sdks matters most to you (85 vs 80)
- →your use case matches its focus: flags + experimentation + product analytics
Pricing side by side
- Model
- Per request (volume-tiered)
- Free tier
- First 1M flag-eval requests/mo free, no credit card
- Free$0/mo
- Pay-as-you-go (1-2M tier)$0.0001 / request
- Pay-as-you-go (2-10M tier)$0.000045 / request
- Pay-as-you-go (10-50M tier)$0.000025 / request
- Pay-as-you-go (50M+ tier)$0.00001 / request
- Model
- Per metered event / MTU-based
- Free tier
- Free: unlimited flag checks + 2M metered events/mo, up to ~1M MTUs
- Developer (Free)$0/month
- Pro$150/month
- EnterpriseCustom
Vendor-published pricing, verified 2026-06-27 (PostHog) and 2026-06-27 (Statsig).
SDK and language coverage
Both · 7
Node.jsPythonRubyGoRustPHP.NET
Only PostHog · 5
Web / JavaScriptJavaiOSAndroidReact
Only Statsig · 5
JavaScript (Web)React / React NativeNext.jsAngularJava / Kotlin
Strengths and weaknesses
- +Generous free tier, first 1M flag-evaluation requests per month are free with full feature access and no credit card
- +Server-side local evaluation cuts flag latency from ~500ms to 10-50ms by removing network I/O
- +Flags are natively wired into PostHog analytics, experiments, and session replay, no event export needed to measure flag impact
- –Reliability has wobbled, four flag-service incidents in late Oct 2025 totaling 14+ hours of major impact (CPU under-sizing root cause)
- –Dense, technical UI with a real learning curve for designing flags, cohorts, and experiment variants
- –Documentation is strong for getting started but thin for advanced flag debugging scenarios
- +Feature-flag and dynamic-config checks are unlimited and free on every tier, you never pay per flag evaluation
- +No per-seat pricing: adding engineers or PMs doesn't change the bill
- +Generous free Developer tier (2M events, unlimited flag checks, 50k session replays, 1-yr retention)
- –Event-/experiment-based metered pricing can produce large surprise bills at high traffic once analytics, experiments or session replay are heavily used
- –No self-hosted / on-prem option, a blocker for strict data-sovereignty requirements
- –Proprietary statistical models are a 'black box', making it hard for data-science teams to validate p-value calculations or run custom frameworks
PostHog vs Statsig: questions
- Which has better documentation, PostHog or Statsig?
- PostHog scores higher on documentation and developer experience: 88 vs 86 out of 100.
- Which is more reliable, PostHog or Statsig?
- Statsig scores higher on reliability: 85 vs 82 out of 100.
- Do PostHog and Statsig have a free tier?
- PostHog: yes (First 1M flag-eval requests/mo free, no credit card). Statsig: yes (Free: unlimited flag checks + 2M metered events/mo, up to ~1M MTUs).
- How are PostHog and Statsig priced?
- PostHog: Per request (volume-tiered). Statsig: Per metered event / MTU-based.
- Which has more official SDKs?
- Both list 12 official SDKs.