facebook/folly

An open-source C++ library developed and used at Facebook.

30.6k stars · 5.9k forks · C++

Healthy

Healthy: actively maintained by 69 people, no known risks.

Why

No rule fired.

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: 408
Human commits, 90 days: 871
Human commits, 365 days: 2.7k
Bot share of commits, 365 days: 0%
Last commit: Oct 14, 2026 (15 hours ago)
Last human commit: Oct 14, 2026 (15 hours ago)
Authors, 90 days: 69
Last release: Oct 12, 2026 (2 days ago)
Median PR merge time: under an hour

Responsiveness: of 12 recent issues, 0% got a maintainer reply. Median first response: n/a.

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, Releases, Merged pull requests, Issues

People

Complete

Owner: Organization
Commits sampled: 498 since Oct 14, 2025
Authors for half of commits: 2
Authors for 80% of commits: 11
Contributors: 279

Top committers

yfeldblum: 30% of commits
snarkmaster: 23% of commits
vitaut: 12% of commits
michel-slm: 5% of commits
genevievehelsel: 2% of commits

Shares come from the newest sampled commits, since the commit sample is capped.

Sources: Commits, Contributors

Stars

Complete

Mostly organic, confidence high

Bars show stars gained each week. Orange 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.

2k stars on a repo created before February 2013 have no date, so they aren't in the chart.
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.

Sources: How star history is analyzed

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.

OpenSSF Scorecard: 5.0 out of 10 (via deps.dev).

Sources: GitHub: facebook/folly

Badge

Add this to a README to show the current verdict:

[![RepoRadar](https://reporadar.ai/facebook/folly/badge.svg)](https://reporadar.ai/facebook/folly)

Earlier verdicts

Oct 14, 2026: Healthy
Oct 14, 2026: Healthy

Computed 11 hours ago · method 2026.10.2