Some mods target the Mono version of the game, which is available by opting into the Steam beta branch "alternate"
S1API Forked
S1API is an open source collaboration project to help standardize Schedule One modding processes.The goal is to provide a standard place for common functionalities so you can focus on making content versus reverse engineering the game.
Available versions
Please note that the install buttons only work if you have compatible client software installed, such as the Thunderstore Mod Manager. Otherwise use the zip download links instead.
| Upload date | Version number | Downloads | Actions |
|---|---|---|---|
| 2026-1-10 | 2.9.3 | 6039 | Download Install |
| 2026-1-8 | 2.9.2 | 834 | Download Install |
| 2026-1-3 | 2.9.1 | 1206 | Download Install |
| 2026-1-2 | 2.9.0 | 611 | Download Install |
| 2025-12-31 | 2.8.9 | 665 | Download Install |
| 2025-12-30 | 2.8.8 | 484 | Download Install |
| 2025-12-30 | 2.8.7 | 329 | Download Install |
| 2025-12-30 | 2.8.6 | 14 | Download Install |
| 2025-12-21 | 2.8.5 | 1609 | Download Install |
| 2025-12-19 | 2.8.4 | 301 | Download Install |
| 2025-12-18 | 2.8.3 | 151 | Download Install |
| 2025-12-15 | 2.8.2 | 316 | Download Install |
| 2025-12-11 | 2.8.1 | 432 | Download Install |
| 2025-12-10 | 2.8.0 | 141 | Download Install |
| 2025-12-10 | 2.7.9 | 37 | Download Install |
| 2025-12-8 | 2.7.8 | 306 | Download Install |
| 2025-12-5 | 2.7.7 | 365 | Download Install |
| 2025-12-1 | 2.7.6 | 557 | Download Install |
| 2025-11-30 | 2.7.5 | 346 | Download Install |
| 2025-11-26 | 2.7.4 | 779 | Download Install |
| 2025-11-24 | 2.7.3 | 286 | Download Install |
| 2025-11-23 | 2.7.2 | 412 | Download Install |
| 2025-11-22 | 2.7.1 | 225 | Download Install |
| 2025-11-22 | 2.7.0 | 16 | Download Install |
| 2025-11-21 | 2.6.9 | 257 | Download Install |
| 2025-11-21 | 2.6.8 | 14 | Download Install |
| 2025-11-20 | 2.6.6 | 101 | Download Install |
| 2025-11-19 | 2.6.5 | 417 | Download Install |
| 2025-11-18 | 2.6.4 | 267 | Download Install |
| 2025-11-15 | 2.6.3 | 570 | Download Install |
| 2025-11-14 | 2.6.2 | 184 | Download Install |
| 2025-11-13 | 2.6.1 | 210 | Download Install |
| 2025-11-13 | 2.6.0 | 40 | Download Install |
| 2025-11-13 | 2.5.9 | 136 | Download Install |
| 2025-11-12 | 2.5.8 | 139 | Download Install |
| 2025-11-11 | 2.5.7 | 142 | Download Install |
| 2025-11-11 | 2.5.6 | 215 | Download Install |
| 2025-11-10 | 2.5.5 | 144 | Download Install |
| 2025-11-10 | 2.5.4 | 71 | Download Install |
| 2025-11-9 | 2.5.3 | 237 | Download Install |
| 2025-11-9 | 2.5.2 | 112 | Download Install |
| 2025-11-9 | 2.5.1 | 144 | Download Install |
| 2025-11-8 | 2.5.0 | 331 | Download Install |
| 2025-11-8 | 2.4.9 | 79 | Download Install |
| 2025-11-5 | 2.4.8 | 476 | Download Install |
| 2025-11-5 | 2.4.7 | 207 | Download Install |
| 2025-11-2 | 2.4.6 | 610 | Download Install |
| 2025-10-30 | 2.4.4 | 508 | Download Install |
| 2025-10-27 | 2.4.3 | 468 | Download Install |
| 2025-10-2 | 2.4.2 | 2695 | Download Install |
| 2025-9-30 | 2.4.1 | 486 | Download Install |
| 2025-9-28 | 2.4.0 | 481 | Download Install |
| 2025-9-28 | 2.3.0 | 131 | Download Install |
| 2025-9-27 | 2.2.0 | 151 | Download Install |
| 2025-9-21 | 1.8.7 | 1058 | Download Install |
| 2025-9-17 | 1.8.6 | 506 | Download Install |
| 2025-9-15 | 1.8.5 | 390 | Download Install |
| 2025-9-15 | 1.8.4 | 162 | Download Install |
| 2025-9-15 | 1.8.3 | 167 | Download Install |
| 2025-9-15 | 1.8.2 | 133 | Download Install |
| 2025-9-14 | 1.8.1 | 296 | Download Install |
| 2025-9-14 | 1.8.0 | 85 | Download Install |
| 2025-9-12 | 1.7.9 | 344 | Download Install |
| 2025-9-12 | 1.7.8 | 70 | Download Install |
| 2025-9-12 | 1.7.7 | 85 | Download Install |
| 2025-9-11 | 1.7.6 | 124 | Download Install |
