PyRank
snowballstem

pystemmer

Python stemming library using snowball stemmers
PyPI GitHub
No known security advisories. The current version has no OSV.dev malware reports and no critical or high-severity vulnerabilities.

pystemmer has 2M monthly downloads and 281 GitHub stars. Version 3.1.0, first published in 2009.

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

It is used by 44 tracked packages, including llama-index-retrievers-bm25, brainpalace-rag and ovos-padatious.

Downloads
Day
75.2K
Week
497.6K
Month
2.0M
Stars
281
Forks
48
Issues
0
Version
3.1.0

Package Insights

What's this?
Score breakdown - each component scores 0-100, weighted by percentage
Maintenance
80
Popularity
51
Adoption
80
Community
30
Provenance
0
How the maintenance status was determined
Last commit
27 days ago
Monthly downloads
1,983,158
• 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
1,983,158
Stars
281
Stars per 1k downloads
0.14
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
71,083
Month daily avg
66,105
Momentum
+7.5%
((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, BSD
• 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
45 days ago
Total releases
12
Releases/year
0.7
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
14
Monthly downloads
1,983,158
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
37
 
Issue Burden
0.0
per 1k stars
Discussions
0.0
per 1k stars
Fork Ratio
29.2%
contrib / forks
Stale Release
No
 
PR Velocity
Quiet
 

Weekly Downloads

GitHub Stars

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

Downloads by OS

Linux 31.6K
Windows 233
macOS 198

Python Versions

3.12
88.0% 27.7K
3.11
5.1% 1.6K
3.13
4.2% 1.3K
3.10
1.5% 457
3.14
1.3% 404

Top Countries

1. US US
28.8K
2. GB GB
720
3. IN IN
475
4. FR FR
351
5. DE DE
281
6. SG SG
273
7. FI FI
256
8. TW TW
101
9. MX MX
67
10. JP JP
66

Package Information

License
MIT, BSD
First Release
November 6, 2009
Last Release
1 month ago
Last Commit
4 weeks ago
Latest Version
3.1.0
Total Releases
12
Contributors
14
Open PRs
0
Archived
No
Author
Richard Boulton
Python Versions
3 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14
Wheels
cp310 cp311 cp312 cp313 cp314 cp36 cp37 cp38 cp39 pp310 pp37 pp38 pp39
Keywords
python information retrieval language processing morphological analysis stemming algorithms stemmers
Tracking Since
January 6, 2026
Data Updated
July 5, 2026
Data Freshness
Fresh

Links