Flagsmith vs PostHog: Feature Flags Comparison (2026)

Flagsmith offers unlimited feature flags, projects, environments, identities, and segments, along with custom fields, real-time flag updates, scheduled flags, and priority support. PostHog provides a generous free tier, usage-based pricing, unlimited team members, and community support.

AI Citation Scorecard

How often each is cited by major AI engines when buyers ask feature flags questions. Last 90 days across ChatGPT, Perplexity, Gemini, Claude, and Copilot.

Flagsmith leads overall — 80% cited vs PostHog 40% across 10 probes.
ChatGPT
Flagsmith
0 / 1 probes
0%
Invisible
PostHog
0 / 1 probes
0%
Invisible
Perplexity
Flagsmith
1 / 1 probes
100%
Excellent
PostHog
1 / 1 probes
100%
Excellent
Gemini
Flagsmith
1 / 1 probes
100%
Excellent
PostHog
1 / 1 probes
100%
Excellent
Claude
FlagsmithLeads
1 / 1 probes
100%
Excellent
PostHog
0 / 1 probes
0%
Invisible
Copilot
FlagsmithLeads
1 / 1 probes
100%
Excellent
PostHog
0 / 1 probes
0%
Invisible
Scale:NoneLowFairStrongExcellent

Probes run hourly; each (engine × query) combo retests every ~3 days.

Pricing

Flagsmith
Starting price
—
Free tier
Yes
flagsmith.com ↗
PostHog
Starting price
$0.00005/event
Free tier
Yes
posthog.com ↗

Key Features

Flagsmith
  • ✓Unlimited Feature Flags
  • ✓Unlimited Projects
  • ✓Unlimited Environments
  • ✓Unlimited Identities and Segments
  • ✓Custom Fields
  • ✓Real-Time Flag Updates
  • ✓Scheduled Flags
  • ✓Priority Support
PostHog
  • ✓Generous free tier
  • ✓Usage-based pricing
  • ✓Unlimited team members
  • ✓Community support

When to choose Flagsmith

Flagsmith is suitable for users who require unlimited feature flags, projects, environments, identities, and segments, along with support for custom fields, real-time updates, and scheduled flags. It also offers priority support for enterprise plans.

When to choose PostHog

PostHog is suitable for users who prefer a usage-based pricing model and need a generous free tier with unlimited team members and community support. It also offers robust analytics features.

Frequently Asked Questions

What are the key differences in pricing and free tier offerings?
Flagsmith offers a free tier and does not specify a starting price, while PostHog has a starting price of $0.00005/event and a free tier with usage limits. Flagsmith offers unlimited feature flags, projects, environments, identities, and segments without specified usage limits, whereas PostHog has a usage-based pricing model.
What are the differences in key features?
Flagsmith's key features include unlimited feature flags, unlimited projects, unlimited environments, unlimited identities and segments, custom fields, real-time flag updates, scheduled flags, and priority support. PostHog's key features include a generous free tier, usage-based pricing, unlimited team members, and community support.
What integrations do Flagsmith and PostHog offer?
Flagsmith integrates with Slack, Discord, Okta, SAML, ADFS, and LDAP. PostHog integrates with Google SSO, GitHub SSO, GitLab SSO, and Slack.
What are the pros of using Flagsmith?
Flagsmith offers a free plan for solo developers, unlimited feature flags and projects, flexible deployment options, and priority support for Enterprise plans.
What are the cons of using Flagsmith?
Flagsmith's pricing details are not fully specified, custom plans require contact for details, there is limited support for the free tier, and overage charges may apply on paid plans.

AI visibility profiles

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Flagsmith

flagsmith.com

PostHog

posthog.com

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