Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.
Entry price
From $45 per month (indicative, Start-up plan)
Free tierFree tier available
Free tierWhat drives the bill
The metric that actually scales your invoice.
Considerably cheaper than LaunchDarkly, and self-hosting removes usage pricing entirely.
Paid tiers are quote-based, priced by monthly tracked keys.
Free tier
Free cloud tier with a monthly request allowance; open-source self-hosting is unlimited.
Free tier with limited monthly tracked keys.
Open source
BSD-3-Clause (core)
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Established
Flagsmith · since 2018
Established
Harness · since 2015
Strengths
Limitations
Best for
Teams wanting straightforward flags without LaunchDarkly pricing or Unleash's operational depth.
Teams that want every release measured, not just deliberate experiments.
All of these integrate with: Datadog, Segment, Slack, Jira.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.