Our take
Pick Flagsmith if app teams who will stay on Cloud Free at $0 (50k requests/month, 1 member) or self-host while they ship a first Features table, then move to Start-Up at $40/month billed yearly ($45 monthly) when they need 1M requests, 3 members, scheduled flags, and email support. Pick PostHog if product / eng teams who will stay on Cloud Free $0 (1M events, 5K replays, 1M flag requests, 1,500 surveys, 100K
open-source feature-flag desk
Best for
Flagsmith Flags you start at $0
PostHog Product events you start at $0
Free plan
Flagsmith $0 · up to 50,000 requests/month. Up to 100,000 users in experiments. 1 team member. Unlimited feature flags, environments, identities, and segments (fair-usage). Additional API calls start at $50/million/month and decrease with volume
PostHog $0 · for the public app. You run it. Cloud US (Virginia) or EU (Frankfurt) on the hosted path
Lowest paid
Flagsmith Overage $7
PostHog Logs retention $0.05
Next step up
Flagsmith
PostHog Setup call $80
Runs where
Flagsmith
PostHog Local; you host it
Watch out
Flagsmith Free is 50k requests/month and 1 member
PostHog Free is 1 project and 1M events
Last checked
Flagsmith 2026-10-23 · flagsmith.com/pricing
PostHog 2026-10-22 · posthog.com/pricing
app teams who will stay on Cloud Free at $0 (50k requests/month, 1 member) or self-host while they ship a first Features table, then move to Start-Up at $40/month billed yearly ($45 monthly) when they need 1M requests, 3 members, scheduled flags, and email support.
Read the Flagsmith pageproduct / eng teams who will stay on Cloud Free $0 (1M events, 5K replays, 1M flag requests, 1,500 surveys, 100K exceptions, 1 project, no card) while they ask a first Insight, then raise a billing limit when a launch week would freeze at the cap — or self-host when they will run the stack.
Read the PostHog page