Head to head
Flagsmith vs PostHog
As a feature flag API, PostHog rates higher on the APIbenchmarks Index, 85.3 to 79.1, a 6.2-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | Flagsmith | PostHog |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 79.1 | 85.3 |
Specifications
| Flagsmith | PostHog | |
|---|---|---|
| Best for | Open-source, self-hostable feature flags + remote config | All-in-one product analytics with built-in flags |
| Free tier | Free cloud: 50k requests/mo, 1 seat, unlimited flags (self-host fully free) | First 1M flag-eval requests/mo free, no credit card |
| Pricing | Per request (API calls) | Per request (volume-tiered) |
| Official SDKs | 12 languages | 12 languages |
Is Flagsmith better than PostHog?
On the APIbenchmarks Index, PostHog rates higher (85.3 vs 79.1). It leads on the four weighted criteria, but price is reported separately, so the best choice still depends on your budget.