No known security advisories.
The current version has no OSV.dev malware reports and no critical or high-severity vulnerabilities.
nmslib has 154K monthly downloads and 4K GitHub stars. Version 2.1.2, first published in 2017.
It is stably maintained, last released in Dec 2025.
It is built on top of numpy, pybind11 and scipy. It is used by 17 tracked packages, including scispacy, ambrosia and spacy-ann-linker.
GitHub topics include knn-search, non-metric and neighborhood-graphs.
Package Insights
Score breakdown - each component scores 0-100, weighted by percentage
Maintenance
65
Popularity
76
Adoption
61
Community
55
Provenance
0
How the maintenance status was determined
Last commit
175 days ago
Monthly downloads
154,308
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
154,308
Stars
3,588
Stars per 1k downloads
23.25
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
4,833
Month daily avg
5,144
Momentum
-6.0%
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100Python 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
Not specified
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
Package does not declare a license.
How the release cadence was determined
Last release
218 days ago
Total releases
27
Releases/year
3.0
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
32
Monthly downloads
154,308
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
55
Issue Burden
19.2
per 1k stars
Discussions
0.0
per 1k stars
Fork Ratio
6.9%
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
4.1K
Windows
25
macOS
11
Python Versions
3.9
74.7%
3.0K
3.10
13.5%
544
3.11
4.2%
168
3.8
4.0%
160
3.12
3.6%
144
Top Countries
1.
US
3.9K
US
2.
GB
80
GB
3.
DE
43
DE
4.
KR
27
KR
5.
SG
23
SG
6.
IN
17
IN
7.
HK
13
HK
8.
AU
12
AU
9.
CN
12
CN
10.
NL
11
NL
GitHub Topics
Tags from the package's GitHub repository describing what it does.
Package Information
License
Unknown
First Release
June 3, 2017
Last Release
7 months ago
Last Commit
5 months ago
Latest Version
2.1.2
Total Releases
27
Contributors
32
Open PRs
5
Archived
No
Author
B. Naidan, L. Boytsov, Yu. Malkov, B. Frederickson, D. Novak, et al.
Wheels
cp27
cp310
cp311
cp312
cp313
cp314
cp35
cp36
cp37
cp38
cp39
Tracking Since
January 6, 2026
Data Updated
July 5, 2026
Data Freshness
Fresh