Head to head
ConfigCat vs PostHog
As a feature flag API, PostHog rates higher on the APIbenchmarks Index, 85.3 to 83.2, a 2.1-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | ConfigCat | PostHog |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 83.2 | 85.3 |
Specifications
| ConfigCat | PostHog | |
|---|---|---|
| Best for | Simple flat-priced feature flags for any team size | All-in-one product analytics with built-in flags |
| Free tier | Free: 10 flags, unlimited seats, unlimited flag reads | First 1M flag-eval requests/mo free, no credit card |
| Pricing | Flat tier (config fetches) | Per request (volume-tiered) |
| Official SDKs | 12 languages | 12 languages |
Is ConfigCat better than PostHog?
On the APIbenchmarks Index, PostHog rates higher (85.3 vs 83.2). 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 2.1 points (85.3 vs 83.2) and wins 3 of 4 criteria; ConfigCat wins 1.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 84 | 88 | |
| Reliability | 78 | 82 | |
| Ecosystem & SDKs | 82 | 80 | |
| Accessibility | 90 | 92 |
Choose ConfigCat if… / choose PostHog if…
- →ecosystem & sdks matters most to you (82 vs 80)
- →your use case matches its focus: simple flat-priced feature flags for any team size
- →documentation & dx matters most to you (88 vs 84)
- →reliability matters most to you (82 vs 78)
- →accessibility matters most to you (92 vs 90)
- →your use case matches its focus: all-in-one product analytics with built-in flags
Pricing side by side
- Model
- Flat tier (config fetches)
- Free tier
- Free: 10 flags, unlimited seats, unlimited flag reads
- Forever Free$0/mo
- Pro$110/mo
- Smart$325/mo
- Enterprise$900/mo
- Dedicated$4,500/mo
- 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
Vendor-published pricing, verified 2026-06-27 (ConfigCat) and 2026-06-27 (PostHog).
SDK and language coverage
Both · 5
.NETReactGoPythonPHP
Only ConfigCat · 7
JavaScript (Browser/Node/Deno/Bun)Cloudflare WorkerJava / AndroidKotlin MultiplatformRuby / Rust / Elixir / C++Swift (iOS) / Dart (Flutter)Unity / Unreal Engine
Only PostHog · 7
Web / JavaScriptNode.jsRubyRustJavaiOSAndroid
Strengths and weaknesses
- +Flat pricing with unlimited team members, MAUs/contexts and flag reads on every tier (including Free), no per-seat or per-MAU charges
- +Genuinely simple to adopt; many teams self-serve in hours without sales contact
- +Generous Forever Free plan with unlimited seats
- –No built-in experimentation/A-B test result analytics, intentionally not an experimentation platform
- –Segment and target-user management can become messy as flag count grows
- –UI has a learning curve for newcomers
- +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
ConfigCat vs PostHog: questions
- Which has better documentation, ConfigCat or PostHog?
- PostHog scores higher on documentation and developer experience: 88 vs 84 out of 100.
- Which is more reliable, ConfigCat or PostHog?
- PostHog scores higher on reliability: 82 vs 78 out of 100.
- Do ConfigCat and PostHog have a free tier?
- ConfigCat: yes (Free: 10 flags, unlimited seats, unlimited flag reads). PostHog: yes (First 1M flag-eval requests/mo free, no credit card).
- How are ConfigCat and PostHog priced?
- ConfigCat: Flat tier (config fetches). PostHog: Per request (volume-tiered).
- Which has more official SDKs?
- Both list 12 official SDKs.