Feature flags + experimentation merged in 2026 — every serious tool offers both. Pick by pricing model, integration depth, and whether you want stats included.
Quick Picks
- Enterprise + reliability→LaunchDarkly. Industry standard.
- Open source / self-host→FlagsmithorGrowthBook
- Best free tier (with PostHog suite)→PostHog
- Built-in stats engine→Statsig
Pricing (May 2026)
| Tool | Free | Paid |
|---|---|---|
| LaunchDarkly | 14-day trial | $10/seat (Foundation, 50K MAU) |
| Flagsmith | 50K req/mo (Cloud) | $45/mo (Startup) |
| Statsig | 1M events/mo | $150/mo (Pro) |
| PostHog | 1M events + 1M flag req | Pay-as-you-go |
| Optimizely | No | Custom (typically $36K+/year) |
What Each Wins At
LaunchDarkly — The Enterprise Default
LaunchDarkly serves 5,000+ customers including Atlassian, Toyota, GoFundMe. Mature SDKs in 30+ languages, role-based access, audit logs. AI Configs (2026) extends flags to manage LLM prompts. Best for: enterprises requiring SOC 2, compliance.
Flagsmith — Open Source Strong
Flagsmith is fully open source — self-host or use their cloud. Hit 5K+ stars. Edge proxy for low latency at the edge. Best for: orgs wanting flag platform without per-seat cost.
Statsig — Stats-First
Statsig was built by ex-Facebook experimentation team. Built-in CUPED, sequential testing, sample-ratio mismatch detection. Best for: data-driven teams running serious experiments.
PostHog — All-in-One
PostHog combines product analytics, feature flags, A/B testing, session replay, and surveys. Self-hostable. Best for: startups wanting one tool covering 5+ analytics needs.
GrowthBook — Bayesian Open Source
GrowthBook is open-source experimentation with Bayesian statistics. SQL-based metric definition feeds your data warehouse. Best for: data teams with warehouse + statisticians who prefer Bayesian.
