PyRank
21cmFAST

21cmfast

Official repository for 21cmFAST: a code for generating fast simulations of the cosmological 21cm signal
PyPI GitHub
More links
Download Stats
Verified repo
Monthly downloads
4.1K
Weekly downloads
1.3K
GitHub stars
81

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

Package Information

Latest Version
4.3.0
Requires Python
>=3.12
Licence
MIT license
Last Release
3 days ago
Author
The 21cmFAST coredev team
First Release
September 19, 2019
Total Releases
28
Python Versions
3 3.12 3.13 3.14
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
90
Popularity
44
Adoption
36
Community
75
Provenance
100
How the maintenance status was determined
Last commit
10 days ago
Monthly downloads
4,073
• 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
4,073
Stars
81
Stars per 1k downloads
19.89
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
184
Month daily avg
136
Momentum
—
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100
Momentum not reported for packages with < 5,000 monthly downloads — percentages are noisy at low volume.
More insights and metrics
Python version support tiers
requires_python
>=3.12
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
MIT 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
2 days ago
Total releases
28
Releases/year
4.0
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
21
Monthly downloads
4,073
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
78
 
Issue Burden
-
per 1k stars
Discussions
-
per 1k stars
Fork Ratio
36.8%
contrib / forks
Stale Release
No
 
PR Velocity
Quiet
 
Not all downloads include detailed metadata. Breakdowns reflect the subset that does.

Downloads by OS

Linux 10

Python Versions

3.12
70.0% 7
2.7
10.0% 1
3.11
10.0% 1
3.7
10.0% 1

Top Countries

1. FR FR
76
2. US US
47
3. JP JP
28
4. DE DE
11
5. SG SG
7
6. BG BG
1

Weekly Downloads

GitHub Stars

Dependencies

17
44 optional dependencies

Used By

1

Repository details

Forks
57
Issues
71
Last Commit
1 week ago
Contributors
21
Open PRs
9
Archived
No

Data and sources

Tracking Since
September 26, 2026
Data Updated
October 11, 2026
Data Freshness
Fresh
Keywords
Epoch of Reionization Cosmology
Sources and methodology