GrowthBook vs Flagsmith

From $40 per seat/month (cloud Pro, up to 30 users and 3 projects)

From $40 per month (Start-Up, billed yearly; $45 monthly)

Seat-based rather than usage-based, so cost tracks the number of people using the platform rather than your traffic — which is why it stays dramatically cheaper than the commercial platforms at scale, especially self-hosted.

Free covers 50k requests a month and one seat; Start-Up raises that to 1M requests and 3 seats, Scale-Up is $250/month yearly. Considerably cheaper than LaunchDarkly, and self-hosting removes usage pricing entirely.

Self-hosted open source is free with unlimited users on 1 project; the cloud Starter tier is free for up to 3 users.

Free cloud tier with a monthly request allowance; open-source self-hosting is unlimited.

Widely used

GrowthBook · since 2021

Established

Flagsmith · since 2018

• Warehouse-native by design — no duplicate event pipeline and no data leaving your control.
• Self-hosting removes per-user-volume pricing entirely.
• Both Bayesian and frequentist engines with sequential testing support.

• Genuinely easy self-hosting with a Docker image and Helm chart.
• Simple, comprehensible pricing.
• Remote config alongside flags, which covers a lot of mobile use cases.

• Requires a working data warehouse and someone who can define metrics in SQL.
• Self-hosting is operational work you own.
• Less polished governance and approval tooling than LaunchDarkly.

• Experimentation features are basic.
• Smaller company and community than the leaders.
• Fewer governance controls for large organisations.

Data-mature teams that already have a warehouse and want to avoid volume-based pricing.

Teams wanting straightforward flags without LaunchDarkly pricing or Unleash's operational depth.