No known security advisories.
The current version has no OSV.dev malware reports and no critical or high-severity vulnerabilities.
pyzstd has 7.9M monthly downloads and 49 GitHub stars. Version 0.19.1 supports Python 3.10+, first published in 2020.
It is stably maintained under a permissive license, last released in Dec 2025.
It is built on top of backports-zstd and typing-extensions. It is used by 63 tracked packages, including clang-tool-chain-bins, clang-tool-chain and babeldoc.
GitHub topics include file, format and seekable.
Package Insights
Package Risks
- No releases in 148 days despite active commits
- Moderate bus factor: only 3 contributor(s) for this download volume
Score breakdown - each component scores 0-100, weighted by percentage
Maintenance
80
Popularity
33
Adoption
70
Community
10
Provenance
100
How the maintenance status was determined
Last commit
57 days ago
Monthly downloads
7,860,495
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
7,860,495
Stars
49
Stars per 1k downloads
0.01
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
253,916
Month daily avg
262,016
Momentum
-3.1%
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100Python 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
•
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
205 days ago
Total releases
90
Releases/year
15.4
•
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
3
Monthly downloads
7,860,495
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
26
Issue Burden
-
per 1k stars
Discussions
-
per 1k stars
Fork Ratio
37.5%
contrib / forks
Stale Release
148d
PR Velocity
Quiet
Weekly Downloads
GitHub Stars
Not all downloads include detailed metadata. Breakdowns reflect the subset that does.
Downloads by OS
Linux
137.2K
Windows
10.7K
macOS
3.3K
Python Versions
3.12
58.6%
76.9K
3.11
14.3%
18.8K
3.10
13.0%
17.1K
3.9
7.1%
9.3K
3.7
6.9%
9.1K
Top Countries
1.
US
109.9K
US
2.
IE
15.9K
IE
3.
IN
6.9K
IN
4.
JP
6.3K
JP
5.
CA
2.5K
CA
6.
NL
2.4K
NL
7.
DE
1.2K
DE
8.
FR
911
FR
9.
SG
653
SG
10.
MY
651
MY
Dependencies
2
- backports-zstd >=1.0.0
- typing-extensions >=4.13.2
Used By
63
- clang-tool-chain-bins
- clang-tool-chain
- babeldoc
- autobuild
- unblob
- django-vcache
- alphatims
- undatum
- alpharaw
- ms-deisotope
- sheerwater
- cdtb
- sciqlop
- wedge-lib
- gupy-framework
- chaos-utils
- swh-osv
- riotmanifest
- trueseeing
- aitf
- terminaluse
- aov-zstd
- palaestrai
- nwn
- pypipegraph2
- palmmeteo
- llmbench-cmri
- glycresoft
- amber-mcap
- range-streams
- antidb
- therock-tools
- agent-log-gif
- pyritofile
- rework
- dbpystream
- mdapi
- full-dia
- maxgcp
- repod
- romlib
- pycoffer
- doctranslater
- babeldoc-utools
- hacku
- ainiee-cli
- aovt
- aigc-evals
- aoza
- gupy-framework-windows-deps
Package Information
License
BSD-3-Clause
First Release
September 2, 2020
Last Release
6 months ago
Last Commit
1 month ago
Latest Version
0.19.1
Total Releases
90
Contributors
3
Open PRs
0
Archived
No
Python Versions
3.10
3.11
3.12
3.13
3.14
Wheels
cp310
cp311
cp312
cp313
cp36
cp37
cp38
cp39
pp39
py3
Tracking Since
January 6, 2026
Data Updated
July 5, 2026
Data Freshness
Fresh