Teams choosing feature flag management tools need a way to distinguish healthy, actively shipping projects from weaker options. This September 2026 snapshot uses the supplied ToolVitals scores, health and shipping measures, project descriptions, openness labels, and license labels.
The ranking covers open/source-visible tools and orders them by ToolVitals score descending, then health and shipping for equal composite scores. GitHub stars are context only and do not affect placement.
Rankings
| Rank | Tool | Openness | License | Health | Shipping | GitHub Stars | Score | Status |
|---|---|---|---|---|---|---|---|---|
| 1 | Flagsmith | OSI-approved OSS | BSD-3-Clause | 97 | 96 | 6577 | 97 | 🟢 Excellent |
| 2 | GrowthBook | OSI-approved OSS | MIT | 97 | 96 | 8445 | 97 | 🟢 Excellent |
| 3 | Unleash | OSI-approved OSS | AGPL-3.0 | 97 | 96 | 13834 | 96 | 🟢 Excellent |
| 4 | Flipt | OSI-approved OSS | MIT | 95 | 93 | 4911 | 94 | 🟢 Excellent |
| 5 | Go Feature Flag | OSI-approved OSS | MIT | 93 | 95 | 2118 | 94 | 🟢 Excellent |
| 6 | FeatBit | OSI-approved OSS | MIT | 90 | 88 | 1907 | 89 | 🟢 Excellent |
| 7 | Featurevisor | OSI-approved OSS | MIT | 72 | 71 | 810 | 71 | 🟢 Good |
| 8 | ConfigDN | OSI-approved OSS | AGPL-3.0 | 64 | 62 | 2 | 63 | 🟢 Good |
| 9 | Flipper | OSI-approved OSS | MIT | 66 | 41 | 3971 | 56 | 🟡 Fair |
| 10 | Rollout.io | OSI-approved OSS | Apache-2.0 | 17 | 5 | 23 | 12 | 🔴 Needs Attention |
| 11 | Flagbridge | OSI-approved OSS | Apache-2.0 | 12 | 3 | 2 | 8 | 🔴 Needs Attention |
| 12 | Switchflag | OSI-approved OSS | MIT | 12 | 0 | 0 | 7 | 🔴 Needs Attention |
| 13 | Flagent | OSI-approved OSS | Apache-2.0 | 9 | 2 | 4 | 6 | 🔴 Needs Attention |
| 14 | OpenFlags | OSI-approved OSS | MIT | 9 | 2 | 16 | 6 | 🔴 Needs Attention |
| 15 | Bandeira | OSI-approved OSS | MIT | 8 | 2 | 19 | 6 | 🔴 Needs Attention |
| 16 | Abby | OSI-approved OSS | AGPL-3.0 | 1 | 0 | 166 | 1 | 🔴 Needs Attention |
| 17 | Flagasaurus | OSI-approved OSS | MPL-2.0 | 0 | 0 | 16 | 0 | 🔴 Needs Attention |
| 18 | SwitchFeat | OSI-approved OSS | AGPL-3.0 | 0 | 0 | 205 | 0 | 🔴 Needs Attention |
Top 3 Highlights
Flagsmith ranks first with a ToolVitals score of 97, a health score of 97, and a shipping score of 96. Its supplied description presents it as an open source feature flagging and remote config service that can be self-hosted or used through a hosted version. Openness: OSI-approved OSS; license: BSD-3-Clause.
GrowthBook ranks second with a ToolVitals score of 97, a health score of 97, and a shipping score of 96. Its supplied description covers feature flags, experimentation, and product analytics, giving it a broader stated scope than feature flag management alone. Openness: OSI-approved OSS; license: MIT.
Unleash ranks third with a ToolVitals score of 96, a health score of 97, and a shipping score of 96. Its supplied description identifies it as an open-source feature management platform. Openness: OSI-approved OSS; license: AGPL-3.0.
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