Online judges
Among many Online judges and competitive coding sites there are some that support Haskell, listed in following table.
| Site | GHC version |
|---|---|
| CodinGame | 8.2.1 |
| Kattis | 7.10.3 |
| CodeWars | 7.10.3 |
| TheAIGame | 7.10 |
| HackerRank | 7.8.4 |
| CodeForces | 7.8.3 |
| CodeFights | 7.6.3 |
| CodeChef | 7.6.3 |
| HackerEarth | 7.6.3 |
| devdraft | 7.6 |
| exercism.io | (unknown, stack) |
| codeabbey | (unknown) |
| edufyme | (unknown) |
| CodeEval | Broken |