PyRank
nucleic

kiwisolver

Efficient C++ implementation of the Cassowary constraint solving algorithm
PyPI GitHub Verified repo
No known security advisories. The current version has no OSV.dev malware reports and no critical or high-severity vulnerabilities.

kiwisolver has 224M monthly downloads and 775 GitHub stars. Version 1.5.0 supports Python 3.10+, first published in 2014.

It is actively maintained under a permissive license, last released in Mar 2026.

It is used by 653 tracked packages, including matplotlib, roboflow and vispy.

Downloads
Day
6.4M
Week
49.8M
Month
224.0M
Stars
775
Forks
105
Issues
19
Version
1.5.0

Package Insights

What's this?
Score breakdown - each component scores 0-100, weighted by percentage
Maintenance
100
Popularity
60
Adoption
70
Community
40
Provenance
100
How the maintenance status was determined
Last commit
5 days ago
Monthly downloads
223,961,002
• 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
223,961,002
Stars
775
Stars per 1k downloads
0.00
• 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
7,112,212
Month daily avg
7,465,367
Momentum
-4.7%
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100
Python version support tiers
requires_python
>=3.10
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
License categories
License
BSD 3-Clause License
• 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
119 days ago
Total releases
23
Releases/year
1.8
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
33
Monthly downloads
223,961,002
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
40
 
Issue Burden
24.5
per 1k stars
Discussions
0.0
per 1k stars
Fork Ratio
31.4%
contrib / forks
Stale Release
114d
 
PR Velocity
Quiet
 

Weekly Downloads

GitHub Stars

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

Downloads by OS

Linux 4.6M
Windows 196.3K
macOS 80.2K

Python Versions

3.13
35.2% 1.4M
3.12
22.6% 914.3K
3.11
17.9% 724.0K
3.10
16.2% 656.4K
3.9
8.2% 330.4K

Top Countries

1. US US
3.8M
2. DE DE
141.5K
3. SG SG
131.5K
4. GB GB
104.4K
5. IE IE
89.4K
6. IN IN
69.9K
7. JP JP
55.1K
8. CN CN
54.7K
9. NL NL
53.7K
10. KR KR
35.8K

Package Information

License
BSD 3-Clause License
First Release
January 10, 2014
Last Release
4 months ago
Last Commit
6 days ago
Latest Version
1.5.0
Total Releases
23
Contributors
33
Open PRs
0
Archived
No
Python Versions
3 3.10 3.11 3.12 3.13 3.14
Wheels
cp27 cp310 cp311 cp312 cp313 cp314 cp34 cp35 cp36 cp37 cp38 cp39 pp310 pp311 pp39
Tracking Since
January 6, 2026
Data Updated
July 5, 2026
Data Freshness
Fresh

Links