Head to head
PostHog vs Split
As a feature flag API, PostHog rates higher on the APIbenchmarks Index, 85.3 to 81.1, a 4.2-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | PostHog | Split |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 85.3 | 81.1 |
Specifications
| PostHog | Split | |
|---|---|---|
| Best for | All-in-one product analytics with built-in flags | Feature management + experimentation (Harness FME) |
| Free tier | First 1M flag-eval requests/mo free, no credit card | Free Developer tier: up to 10 seats, 50 feature flags |
| Pricing | Per request (volume-tiered) | Per-seat (usage-based at scale) |
| Official SDKs | 12 languages | 12 languages |
Is PostHog better than Split?
On the APIbenchmarks Index, PostHog rates higher (85.3 vs 81.1). 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
PostHog leads by 4.2 points (85.3 vs 81.1) and wins 2 of 4 criteria; Split wins 2.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 88 | 80 | |
| Reliability | 82 | 84 | |
| Ecosystem & SDKs | 80 | 82 | |
| Accessibility | 92 | 78 |
Choose PostHog if… / choose Split if…
- →documentation & dx matters most to you (88 vs 80)
- →accessibility matters most to you (92 vs 78)
- →your use case matches its focus: all-in-one product analytics with built-in flags
- →reliability matters most to you (84 vs 82)
- →ecosystem & sdks matters most to you (82 vs 80)
- →your use case matches its focus: feature management + experimentation (harness fme)
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-seat (usage-based at scale)
- Free tier
- Free Developer tier: up to 10 seats, 50 feature flags
- Free / Developer$0
- Team (Starter)from $33 / seat / month
- Business / GrowthCustom (contact sales)
- EnterpriseCustom (contact sales)
Vendor-published pricing, verified 2026-06-27 (PostHog) and 2026-06-27 (Split).
SDK and language coverage
Both · 7
PythonRubyGoPHPJavaiOSAndroid
Only PostHog · 5
Web / JavaScriptNode.jsRust.NETReact
Only Split · 5
JavaScript (Node.js & Browser).NET / C#FlutterReact / React NativeAngular & Redux utilities
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
- +Experimentation is first-class: rolling out a flag automatically attributes it to business/operational metrics with statistical significance testing
- +Local, in-memory SDK evaluation backed by Fastly CDN + streaming means sub-millisecond treatment evaluation and millisecond flag propagation
- +Strong, granular customer segmentation/targeting ("splits") on user attributes
- –Premium pricing, generally more expensive than LaunchDarkly, with metered "traffic keys"/MTUs that make scaling costs hard to predict
- –Pricing is opaque: Growth/Enterprise require contacting sales, and most advanced features (data export, SSO, audit logs) are gated to Enterprise
- –Weaker native CI/CD pipeline integration than competitors; some connections need custom webhooks or Zapier
PostHog vs Split: questions
- Which has better documentation, PostHog or Split?
- PostHog scores higher on documentation and developer experience: 88 vs 80 out of 100.
- Which is more reliable, PostHog or Split?
- Split scores higher on reliability: 84 vs 82 out of 100.
- Do PostHog and Split have a free tier?
- PostHog: yes (First 1M flag-eval requests/mo free, no credit card). Split: yes (Free Developer tier: up to 10 seats, 50 feature flags).
- How are PostHog and Split priced?
- PostHog: Per request (volume-tiered). Split: Per-seat (usage-based at scale).
- Which has more official SDKs?
- Both list 12 official SDKs.