# [meta/folly](https://github.com/meta/folly) An open-source C++ library developed and used at Facebook. 30.6k stars · 5.9k forks · C++ Quick update: star history is from the full report of Oct 14, 2026. Healthy Actively maintained by 20 people, no known risks. ## Why No warning signs: none of the [verdict rules](https://reporadar.ai/methodology) applied to this repo. ### What would change this - Partly checked: maintenance (Commit counts are estimated: the commit sample stops before the window start, so GitHub's totals were scaled by the sampled bot share.; Authors in the last 90 days are counted from the sampled commits only.) - A dormant maintenance status, a deprecated or archived package, a successor link, or a critical advisory would change this. ## Maintenance Partial Active **Human commits, 30 days** 568 **Human commits, 90 days** 1.3k **Human commits, 365 days** 3.1k **Bot share of commits, 365 days** 0% **Last commit** Nov 12, 2026 (11 hours ago) **Last human commit** Nov 12, 2026 (11 hours ago) **Authors, 90 days** 20 **Last release** Oct 26, 2026 (17 days ago) **Median PR merge time** under an hour Responsiveness: of 19 recent issues, 5% got a maintainer reply. Median first response: 3 hours. - Commit counts are estimated: the commit sample stops before the window start, so GitHub's totals were scaled by the sampled bot share. - Authors in the last 90 days are counted from the sampled commits only. Sources: [Commits](https://github.com/meta/folly/commits), [Releases](https://github.com/meta/folly/releases), [Merged pull requests](https://github.com/meta/folly/pulls?q=is%3Apr+is%3Amerged), [Issues](https://github.com/meta/folly/issues?q=is%3Aissue) ## People Complete **Owner** Organization **Commits sampled** 100 since Nov 12, 2025 **Authors for half of commits** 3 **Authors for 80% of commits** 6 **Contributors** 280 ### Top committers - yfeldblum: 20% of commits - vitaut: 18% of commits - r-barnes: 15% of commits - DenisYaroshevskiy: 10% of commits - jlhe97: 10% of commits - Shares come from the newest sampled commits, since the commit sample is capped. Sources: [Commits](https://github.com/meta/folly/commits), [Contributors](https://github.com/meta/folly/graphs/contributors) ## Stars Complete Mostly organic, confidence high Bars show stars gained each week. Red bars overlap a burst. ### Bursts - **Feb 24, 2014 to Feb 24, 2014**: about 14 more stars than usual, peak 15 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained. - **Aug 30, 2014 to Sep 3, 2014**: about 295 more stars than usual, peak 209 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained. - **Jun 19, 2015 to Jun 24, 2015**: about 168 more stars than usual, peak 64 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained. - **Jan 2, 2016 to Jan 6, 2016**: about 165 more stars than usual, peak 67 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained. - **Sep 25, 2016 to Sep 27, 2016**: about 124 more stars than usual, peak 84 in one day, a spike that tapers off. Outside explanation: a jump in forks. - **Oct 2, 2017 to Oct 3, 2017**: about 56 more stars than usual, peak 51 in one day, a spike that tapers off. Outside explanation: a jump in forks. - **Apr 26, 2019 to Apr 29, 2019**: about 127 more stars than usual, peak 68 in one day, a spike that tapers off. Outside explanation: a jump in forks. - **Apr 16, 2020 to Apr 21, 2020**: about 288 more stars than usual, peak 110 in one day, a spike that tapers off. Outside explanation: a Hacker News post. - **Apr 11, 2021 to Apr 14, 2021**: about 90 more stars than usual, peak 34 in one day, a spike that tapers off. Outside explanation: a jump in issues and pull requests. - **May 15, 2021 to May 18, 2021**: about 133 more stars than usual, peak 92 in one day, a spike that tapers off. Outside explanation: a jump in issues and pull requests. - **Jun 8, 2021 to Jun 11, 2021**: about 258 more stars than usual, peak 148 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained. - **Jul 13, 2021 to Jul 16, 2021**: about 268 more stars than usual, peak 86 in one day, a flat block of stars. No outside explanation found, so this burst is unexplained. - **Aug 25, 2021 to Sep 1, 2021**: about 394 more stars than usual, peak 122 in one day, a spike that tapers off. Outside explanation: a jump in issues and pull requests. - **Sep 23, 2021 to Sep 26, 2021**: about 221 more stars than usual, peak 91 in one day, a shape we can't classify. Outside explanation: a jump in issues and pull requests. - **Dec 4, 2021 to Dec 5, 2021**: about 57 more stars than usual, peak 50 in one day, a spike that tapers off. Outside explanation: a jump in issues and pull requests. - **Jan 7, 2022 to Jan 11, 2022**: about 197 more stars than usual, peak 104 in one day, a spike that tapers off. Outside explanation: a Hacker News post, a jump in issues and pull requests. - **Feb 24, 2022 to Feb 26, 2022**: about 135 more stars than usual, peak 58 in one day, a flat block of stars. Outside explanation: a jump in issues and pull requests. - **Jun 9, 2022 to Jun 11, 2022**: about 97 more stars than usual, peak 40 in one day, a spike that tapers off. Outside explanation: a jump in issues and pull requests. - **Jun 27, 2022 to Jul 1, 2022**: about 182 more stars than usual, peak 72 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained. - **Oct 14, 2022 to Oct 17, 2022**: about 119 more stars than usual, peak 49 in one day, a spike that tapers off. Outside explanation: a jump in issues and pull requests. - **Jan 20, 2023 to Jan 23, 2023**: about 436 more stars than usual, peak 306 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained. - **Jun 28, 2023 to Jul 2, 2023**: about 178 more stars than usual, peak 48 in one day, a spike that tapers off. Outside explanation: a jump in issues and pull requests. - **Jun 14, 2024 to Jun 16, 2024**: about 81 more stars than usual, peak 46 in one day, a spike that tapers off. Outside explanation: a jump in issues and pull requests. - **Aug 29, 2024 to Aug 30, 2024**: about 72 more stars than usual, peak 47 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained. - **Jan 16, 2025 to Jan 19, 2025**: about 172 more stars than usual, peak 71 in one day, a spike that tapers off. Outside explanation: a jump in issues and pull requests. - **Sep 13, 2025 to Sep 14, 2025**: about 67 more stars than usual, peak 59 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained. - 1 stars GitHub has since removed (tracked since Oct 14, 2026). Anyone can buy stars for any repo; bursts alone don't prove the owner did. - Some star bursts have no matching forks, issues, releases, or launch coverage. - Anyone can buy stars for any repo, so this describes the star history only. - 2001 stars on the creation day are undated (before 2013-02-10) and are not counted. - Star history from the full report of Oct 14, 2026; this update did not re-read it. Sources: [How star history is analyzed](https://reporadar.ai/methodology#stars) ## Risk Complete ### Flags No risk flags. ### License **Now** Apache-2.0 (OSI-approved) **A year ago** Apache-2.0 (OSI-approved) ### Packages No published packages found. Sources: [GitHub: meta/folly](https://github.com/meta/folly) ## Compare Weighing meta/folly against an alternative? See both side by side. ## Badge ![RepoRadar: Healthy](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22112%22%20height%3D%2220%22%20role%3D%22img%22%20aria-label%3D%22reporadar%3A%20healthy%22%3E%3Ctitle%3Ereporadar%3A%20healthy%3C%2Ftitle%3E%3CclipPath%20id%3D%22r%22%3E%3Crect%20width%3D%22112%22%20height%3D%2220%22%20rx%3D%223%22%2F%3E%3C%2FclipPath%3E%3Cg%20clip-path%3D%22url(%23r)%22%3E%3Crect%20width%3D%2263%22%20height%3D%2220%22%20fill%3D%22%23555%22%2F%3E%3Crect%20x%3D%2263%22%20width%3D%2249%22%20height%3D%2220%22%20fill%3D%22%232e7d32%22%2F%3E%3C%2Fg%3E%3Cg%20fill%3D%22%23fff%22%20text-anchor%3D%22middle%22%20font-family%3D%22Verdana%2CGeneva%2CDejaVu%20Sans%2Csans-serif%22%20font-size%3D%2211%22%3E%3Ctext%20x%3D%2232%22%20y%3D%2214%22%3Ereporadar%3C%2Ftext%3E%3Ctext%20x%3D%2288%22%20y%3D%2214%22%3Ehealthy%3C%2Ftext%3E%3C%2Fg%3E%3C%2Fsvg%3E) Add this to a README to show the current verdict: ``` [![RepoRadar](https://reporadar.ai/meta/folly/badge.svg)](https://reporadar.ai/meta/folly) ``` ## Follow Get told when this verdict changes. Add the feed to any feed reader: you get one entry per change, not one per refresh. ``` https://reporadar.ai/meta/folly/feed.xml ``` [Open the feed](https://reporadar.ai/meta/folly/feed.xml) ## More repos rated Healthy [See all](https://reporadar.ai/-/reports/healthy) - [cheeriojs/cheerio](https://reporadar.ai/cheeriojs/cheerio) 30.5k stars - [openai/openai-agents-python](https://reporadar.ai/openai/openai-agents-python) 30.6k stars - [assafelovic/gpt-researcher](https://reporadar.ai/assafelovic/gpt-researcher) 30.6k stars - [Infisical/infisical](https://reporadar.ai/Infisical/infisical) 30.4k stars - [helm/helm](https://reporadar.ai/helm/helm) 30.4k stars - [better-auth/better-auth](https://reporadar.ai/better-auth/better-auth) 30.7k stars ## Earlier verdicts - Nov 12, 2026: Healthy - Nov 11, 2026: Healthy - Nov 10, 2026: Healthy - Nov 9, 2026: Healthy - Nov 8, 2026: Healthy - Nov 7, 2026: Healthy - Nov 6, 2026: Healthy - Nov 5, 2026: Healthy - Nov 4, 2026: Healthy - Nov 3, 2026: Healthy Computed 10 hours ago · method 2026.10.2 Source: https://reporadar.ai/meta/folly