systemdesign42/system-design-academy
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29.3k stars · 3.8k forks
This repo isn't software code, so code checks are limited.
Caution
Caution: one person wrote most of the recent commits.
Why
- One person wrote 100% of human commits in the last year, so the project depends on them continuing. The repository holds mostly documentation, data or model files, so inactivity matters less than for a code library. (source 1, source 2)
What would change this
- A second person takes a substantial share of commits.
Maintenance
CompleteActive
- Human commits, 30 days
- 15
- Human commits, 90 days
- 39
- Human commits, 365 days
- 121
- Bot share of commits, 365 days
- 0%
- Last commit
- Oct 12, 2026 (2 days ago)
- Last human commit
- Oct 12, 2026 (2 days ago)
- Authors, 90 days
- 1
- Last release
- none found
- Median PR merge time
- n/a
Responsiveness: of 0 recent issues, n/a got a maintainer reply. Median first response: n/a.
- Only 0 recent issues can be checked for a response, too few to measure response time.
Sources: Commits, Releases, Merged pull requests, Issues
People
Complete- Owner
- Personal account
- Commits sampled
- 121 since Oct 14, 2025
- Authors for half of commits
- 1
- Authors for 80% of commits
- 1
- Contributors
- 1
Top committers
- systemdesign42: 100% of commits
Sources: Commits, Contributors
Stars
CompleteMostly organic, confidence high
Bursts
- Apr 28, 2024 to May 12, 2024: about 1.5k more stars than usual, peak 342 in one day, a shape we can't classify. Outside explanation: a jump in forks.
- Jun 4, 2024 to Jun 9, 2024: about 404 more stars than usual, peak 205 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Aug 19, 2024 to Aug 30, 2024: about 926 more stars than usual, peak 343 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Sep 29, 2024 to Sep 30, 2024: about 163 more stars than usual, peak 134 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Nov 1, 2024 to Nov 4, 2024: about 251 more stars than usual, peak 154 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Nov 28, 2024 to Nov 30, 2024: about 222 more stars than usual, peak 159 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Jan 27, 2025 to Jan 30, 2025: about 365 more stars than usual, peak 169 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Mar 8, 2025 to Mar 15, 2025: about 522 more stars than usual, peak 234 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Apr 18, 2025 to Apr 25, 2025: about 396 more stars than usual, peak 163 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- May 21, 2025 to May 25, 2025: about 229 more stars than usual, peak 137 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Jun 5, 2025 to Jun 7, 2025: about 84 more stars than usual, peak 63 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Jul 17, 2025 to Jul 21, 2025: about 163 more stars than usual, peak 89 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Sep 27, 2025 to Oct 3, 2025: about 276 more stars than usual, peak 131 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Oct 21, 2025 to Oct 22, 2025: about 67 more stars than usual, peak 55 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Nov 11, 2025 to Nov 12, 2025: about 177 more stars than usual, peak 139 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Nov 20, 2025 to Dec 3, 2025: about 2k more stars than usual, peak 859 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Jan 27, 2026 to Feb 3, 2026: about 306 more stars than usual, peak 120 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Mar 6, 2026 to Mar 7, 2026: about 131 more stars than usual, peak 104 in one day, a spike that tapers off. Outside explanation: a jump in forks.
- Mar 13, 2026 to Mar 24, 2026: about 2.6k more stars than usual, peak 814 in one day, a spike that tapers off. We couldn't check for an outside explanation.
- Jun 1, 2026 to Jun 7, 2026: about 960 more stars than usual, peak 405 in one day, a spike that tapers off. We couldn't check for an outside explanation.
- Jul 1, 2026 to Jul 7, 2026: about 673 more stars than usual, peak 316 in one day, a spike that tapers off. We couldn't check for an outside explanation.
- Jul 23, 2026 to Jul 24, 2026: about 102 more stars than usual, peak 84 in one day, a spike that tapers off. We couldn't check for an outside explanation.
- Aug 6, 2026 to Aug 7, 2026: about 320 more stars than usual, peak 264 in one day, a spike that tapers off. We couldn't check for an outside explanation.
- Aug 31, 2026 to Sep 2, 2026: about 390 more stars than usual, peak 222 in one day, a spike that tapers off. We couldn't check for an outside explanation.
- Sep 15, 2026 to Sep 16, 2026: about 176 more stars than usual, peak 106 in one day, a spike that tapers off. We couldn't check for an outside explanation.
- Sep 30, 2026 to Sep 30, 2026: about 122 more stars than usual, peak 138 in one day, a spike that tapers off. We couldn't check for an outside explanation.
- 1 stars GitHub has since removed (tracked since Oct 14, 2026).
Anyone can buy stars for any repo; bursts alone don't prove the owner did.
- Anyone can buy stars for any repo, so this describes the star history only.
- Engagement is not compared for non-code or mirror repositories.
Sources: How star history is analyzed
Risk
CompleteFlags
No risk flags.
License
- Now
- No license found
- A year ago
- Not known
Packages
No published packages found.
Badge
Add this to a README to show the current verdict:
[](https://reporadar.ai/systemdesign42/system-design-academy)Earlier verdicts
- Oct 14, 2026: Caution
- Oct 14, 2026: Caution
Computed 10 hours ago · method 2026.10.2