PyRank
dfm

emcee

The Python ensemble sampling toolkit for affine-invariant MCMC
PyPI GitHub
No known security advisories. The current version has no OSV.dev malware reports and no critical or high-severity vulnerabilities.

emcee has 571K monthly downloads and 2K GitHub stars. Version 3.1.6, first published in 2012.

It is stably maintained under a permissive license, last released in Apr 2024.

It is built on top of numpy. It is used by 258 tracked packages, including gstools, emukit and pyextremes.

GitHub topics include mcmc, mcmc-sampler and probabilistic-data-analysis.

Downloads
Day
13.8K
Week
91.7K
Month
571.0K
Stars
1.6K
Forks
438
Issues
57
Version
3.1.6

Package Insights

What's this?
Score breakdown - each component scores 0-100, weighted by percentage
Maintenance
65
Popularity
71
Adoption
57
Community
80
Provenance
0
How the maintenance status was determined
Last commit
113 days ago
Monthly downloads
570,953
Active
Activity within 30 days
• Stable
Activity within 31-180 days
Minimal
Activity within 181-365 days, or no activity data
At Risk
No activity for > 365 days, but > 10,000 monthly downloads
Archived
Repository flagged as archived on GitHub
How the popularity category was determined
Monthly downloads
570,953
Stars
1,588
Stars per 1k downloads
2.78
Industry Standard
> 10,000,000 monthly downloads
Hidden Gem
< 0.5 stars per 1k downloads and > 100,000 monthly downloads
Community Favorite
> 5 stars per 1k downloads
• Rising Star
Balanced ratio of stars to downloads
Unknown
Fewer than 1,000 monthly downloads, or no star data
How download momentum is calculated
Week daily avg
13,103
Month daily avg
19,032
Momentum
-31.2%
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100
Python version support tiers
requires_python
Not specified
Cutting Edge
Minimum supported version is 3.12 or newer
Modern
Minimum supported version is 3.9, 3.10, or 3.11
Legacy
Supports 3.8 or older (or Python 2)
• Unknown
No requires_python specified or unparseable
Package does not declare a minimum Python version.
License categories
License
MIT
• Permissive
MIT, Apache, BSD, ISC, Unlicense, CC0, etc.
Copyleft
GPL, LGPL, AGPL, MPL, EPL, etc.
Proprietary
Commercial, all rights reserved, custom EULAs
Unknown
No license specified, or none of the above match
How the release cadence was determined
Last release
808 days ago
Total releases
27
Releases/year
1.9
Rapid
Last release within 365 days and > 12 releases/year
Regular
Last release within 365 days
Slow
Last release 366-730 days ago
• Stalled
Last release > 730 days ago, or no releases
Unknown
No usable release date available
How contributor risk was determined
Contributors
66
Monthly downloads
570,953
High Load
≤ 2 contributors and ≥ 50,000 monthly downloads
Moderate Load
< 10 contributors and ≥ 500,000 monthly downloads
Low Load
< 25 contributors and ≥ 5,000,000 monthly downloads, or sole maintainer with ≥ 10,000 monthly downloads
• Balanced
Enough contributors for the package's popularity
Unknown
No contributor data available
Engagement
76
 
Issue Burden
35.9
per 1k stars
Discussions
0.0
per 1k stars
Fork Ratio
15.1%
contrib / forks
Stale Release
695d
 
PR Velocity
Quiet
 

Weekly Downloads

GitHub Stars

Not all downloads include detailed metadata. Breakdowns reflect the subset that does.

Downloads by OS

Linux 9.2K
Windows 259
macOS 204

Python Versions

3.10
43.2% 4.0K
3.11
31.6% 2.9K
3.12
15.8% 1.5K
3.13
7.8% 727
3.14
1.6% 150

Top Countries

1. US US
8.4K
2. SG SG
623
3. BE BE
221
4. IE IE
143
5. CN CN
102
6. NL NL
74
7. FI FI
51
8. DE DE
49
9. HK HK
42
10. JP JP
41
GitHub Topics
Tags from the package's GitHub repository describing what it does.

Package Information

License
MIT
First Release
February 12, 2012
Last Release
2 years ago
Last Commit
3 months ago
Latest Version
3.1.6
Total Releases
27
Contributors
66
Open PRs
14
Archived
No
Author
Daniel Foreman-Mackey
Wheels
py2 py3
Tracking Since
January 6, 2026
Data Updated
July 5, 2026
Data Freshness
Fresh

Links