The short answer
PostHog is billed per request (volume-tiered). It has a free tier: First 1M flag-eval requests/mo free, no credit card. Paid usage is quoted by the vendor rather than listed as a public price.
Plans and prices
| Plan | Price | What it covers |
|---|---|---|
| Free | $0/mo | First 1,000,000 feature-flag requests per month free; no credit card required; full flag feature set. |
| Pay-as-you-go (1-2M tier) | $0.0001 / request | Per-request rate applied to flag-evaluation requests beyond the 1M free monthly allowance. |
| Pay-as-you-go (2-10M tier) | $0.000045 / request | Volume-discounted rate for 2-10M monthly flag requests. |
| Pay-as-you-go (10-50M tier) | $0.000025 / request | Volume-discounted rate for 10-50M monthly flag requests. |
| Pay-as-you-go (50M+ tier) | $0.00001 / request | Lowest tier, a 10x reduction vs the entry rate, for 50M+ monthly flag requests. |
How PostHog bills you
The pricing model is per request (volume-tiered). Open-source product OS where feature flags ride alongside analytics, session replay and experiments; flags are priced per evaluation request with a huge free allowance. Best suited to: all-in-one product analytics with built-in flags.
What to watch for on the bill
- Request-based billing means high-traffic client-side evaluation can get expensive without adopting local evaluation
The pricing page we read
Source: https://posthog.com/pricing. Prices change, so confirm there before you commit.
Compare PostHog with alternatives
Other feature flag apis: LaunchDarkly, Statsig, ConfigCat, Split, Flagsmith.
Looking at quality rather than price? See the PostHog score on APIbenchmarks. Full entry: PostHog pricing.