Choosing a feature flag platform means balancing release controls, deployment flexibility, project health, and ongoing maintenance. This July 2026 ToolVitals snapshot compares 18 tools using the supplied ToolVitals, health, shipping, licensing, and GitHub popularity data.
The ranking includes open and source-visible tools, ordered first by ToolVitals score and then by GitHub stars as a secondary popularity signal. Scores and ordering are preserved exactly as supplied; licenses and openness are stated separately so availability of source code is not confused with licensing status.
Rankings
| Rank | Tool | Openness | License | Health | Shipping | GitHub Stars | Score | Status |
|---|---|---|---|---|---|---|---|---|
| 1 | Unleash | OSI-approved OSS | AGPL-3.0 | 100 | 100 | 13683 | 100 | 🟢 Excellent |
| 2 | Flagsmith | OSI-approved OSS | BSD-3-Clause | 98 | 100 | 6456 | 99 | 🟢 Excellent |
| 3 | Go Feature Flag | OSI-approved OSS | MIT | 87 | 95 | 2064 | 93 | 🟢 Excellent |
| 4 | GrowthBook | OSI-approved OSS | MIT | 89 | 83 | 8035 | 90 | 🟢 Excellent |
| 5 | FeatBit | OSI-approved OSS | MIT | 90 | 75 | 1900 | 88 | 🟢 Excellent |
| 6 | Flipt | OSI-approved OSS | MIT | 78 | 78 | 4853 | 84 | 🟢 Excellent |
| 7 | Flipper | OSI-approved OSS | MIT | 74 | 42 | 3961 | 70 | 🟢 Good |
| 8 | Rollout.io | OSI-approved OSS | Apache-2.0 | 57 | 46 | 21 | 64 | 🟢 Good |
| 9 | Featurevisor | OSI-approved OSS | MIT | 64 | 11 | 803 | 55 | 🟡 Fair |
| 10 | Switchflag | OSI-approved OSS | MIT | 44 | 7 | 0 | 44 | 🟡 Fair |
| 11 | ConfigDN | OSI-approved OSS | AGPL-3.0 | 37 | 10 | 2 | 41 | 🟡 Fair |
| 12 | Abby | OSI-approved OSS | AGPL-3.0 | 37 | 0 | 166 | 39 | 🔴 Needs Attention |
| 13 | Flagbridge | OSI-approved OSS | Apache-2.0 | 32 | 10 | 2 | 38 | 🔴 Needs Attention |
| 14 | OpenFlags | OSI-approved OSS | MIT | 27 | 4 | 15 | 36 | 🔴 Needs Attention |
| 15 | Flagent | OSI-approved OSS | Apache-2.0 | 29 | 4 | 4 | 36 | 🔴 Needs Attention |
| 16 | Bandeira | OSI-approved OSS | MIT | 27 | 4 | 19 | 33 | 🔴 Needs Attention |
| 17 | Flagasaurus | OSI-approved OSS | MPL-2.0 | 26 | 0 | 17 | 29 | 🔴 Needs Attention |
| 18 | SwitchFeat | OSI-approved OSS | AGPL-3.0 | 6 | 0 | 205 | 21 | 🔴 Needs Attention |
Top 3 Highlights
Unleash ranks first with a ToolVitals score of 100, backed by perfect health and shipping scores of 100 and 13,683 GitHub stars. Its current architecture keeps backend flag evaluation inside application SDKs, caches flag data in memory, and avoids sending user data to the Unleash server. It is labeled OSI-approved OSS under AGPL-3.0.
Flagsmith places second with a ToolVitals score of 99, a health score of 98, a shipping score of 100, and 6,456 GitHub stars. Its current flag-management documentation covers typed remote configuration, weighted multivariate variants, per-environment values, and segment overrides, giving teams more than simple boolean switches. It is labeled OSI-approved OSS under BSD-3-Clause.
Go Feature Flag ranks third with a ToolVitals score of 93, a health score of 87, a shipping score of 95, and 2,064 GitHub stars. Its documented setup stores flags in configuration files, runs a self-hosted relay proxy, and connects applications through OpenFeature SDKs and providers. It is labeled OSI-approved OSS under MIT.
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