PyRank
stan-dev

cmdstanpy

CmdStanPy is a lightweight interface to Stan for Python users which provides the necessary objects and functions to compile a Stan program and fit the model to data using CmdStan.
PyPI GitHub
More links
Download Stats Bug Tracker
Verified repo
Monthly downloads
4.1M
Weekly downloads
962.0K
GitHub stars
198

Downloads in the 30 and 7 days to October 10, 2026. Refreshed weekly.

Package Information

Latest Version
1.3.0
Requires Python
>=3.9
Licence
BSD-3-Clause
Last Release
12 months ago
Author
Stan Dev Team
First Release
July 19, 2019
Total Releases
45
Python Versions
3
No reported malware or high/critical advisories · Details

The current version has no OSV.dev malware reports and no critical or high-severity vulnerabilities.

Package Insights

What's this?
Score breakdown - each component scores 0-100, weighted by percentage
Maintenance
100
Popularity
51
Adoption
80
Community
70
Provenance
100
How the maintenance status was determined
Last commit
6 days ago
Monthly downloads
4,054,187
• 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
4,054,187
Stars
198
Stars per 1k downloads
0.05
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
137,423
Month daily avg
135,140
Momentum
+1.7%
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100
More insights and metrics
Python version support tiers
requires_python
>=3.9
Cutting Edge
Minimum supported version is 3.14 or newer
Modern
Minimum supported version is 3.11 to 3.13
• Legacy
Supports 3.10 or older (or Python 2)
Unknown
No requires_python specified or unparseable
License categories
License
BSD-3-Clause
• 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
360 days ago
Total releases
45
Releases/year
6.2
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
45
Monthly downloads
4,054,187
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
75
 
Issue Burden
131.3
per 1k stars
Discussions
35.4
per 1k stars
Fork Ratio
54.9%
contrib / forks
Stale Release
354d
 
PR Velocity
Quiet
 
Not all downloads include detailed metadata. Breakdowns reflect the subset that does.

Downloads by OS

Linux 91.7K
Windows 255
macOS 207

Python Versions

3.12
36.4% 31.9K
3.11
27.8% 24.3K
3.10
25.2% 22.1K
3.9
6.8% 5.9K
3.13
3.8% 3.4K

Top Countries

1. US US
59.3K
2. DE DE
7.1K
3. IE IE
6.0K
4. NL NL
3.5K
5. GR GR
3.0K
6. AU AU
2.6K
7. SE SE
2.3K
8. IN IN
1.6K
9. SG SG
976
10. GB GB
892

Weekly Downloads

GitHub Stars

Dependencies

4
19 optional dependencies

Used By

39
View all 39 dependents

Repository details

Forks
82
Issues
26
Last Commit
1 week ago
Contributors
45
Open PRs
3
Archived
No

Data and sources

Tracking Since
September 26, 2026
Data Updated
October 11, 2026
Data Freshness
Fresh
Sources and methodology