Head to head
| Metric | AFL++ | Hypothesis | fast-check | proptest |
|---|---|---|---|---|
| Stars | 6.9k | 9.2k | 5.2k | 2.3k |
| Weekly downloads | n/a | 17M | 72.5M | 8.1M |
| Download growth | n/a | +34% | +98% | +83% |
| Popularity score | 70/100 | 81/100 | 83/100 | 74/100 |
| Forks | 1.3k | 699 | 218 | 239 |
| Open issues | 24 | 51 | 46 | 152 |
| Last commit | 3d ago | 4d ago | 4d ago | 4w ago |
| Latest version | n/a | 6.170.15Nov 6, 2026 | 4.10.2 | 1.12.0Oct 10, 2026 |
| License | AGPL-3.0 | n/a | MIT | Apache-2.0 |
| First released | 2019 | 2013 | 2017 | 2017 |
| Signals | Popular | Popular | Trending (detected automatically) | None |
| Listed in | Testing & QA › Property-Based, Mutation & Fuzz Testing | Testing & QA › Property-Based, Mutation & Fuzz Testing | Testing & QA › Property-Based, Mutation & Fuzz Testing | Testing & QA › Property-Based, Mutation & Fuzz Testing |
Weekly downloads over time
Hover for exact values; switch to log scale for tools of very different sizes. Not shown (no comparable download data): AFL++, fast-check, proptest.