About S1API
From ThunderstoreA Schedule One Mono / Il2Cpp Cross Compatibility Layer
A Schedule One Mono / Il2Cpp Cross Compatibility Layer
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.
Do I need this?
If you're using or plan to use any mods that depend on S1API, then yes.
How do I use this to make mods?
Go check out the extremely helpful resources on our GitHub.
I'm getting errors from S1API, what do I do?
Please head over to the GitHub page and create a new issue for us. You can also post in the modding Discord under our thread 😀.
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Drop us an endorsement ❤️
It's not easy being an API. Content is always king, not the backend glue! Endorsements are free and really helps drive our motivation for this project.
Highlights
From source dataLoaders
Runs on BepInEx.
Footprint
Rated a light load on a server.
Dependencies
Needs 1 other project installed alongside it.
S1API on Nxeon
From our catalogue- One-click install
- Not available. One-click install isn't available for this game's mods yet. Download it and upload it to your server in Files.
- Server type needed
- BepInEx
- Server load
- light
- Latest build
- 1.6.2, released 2025-04-29
Game versions by loader
| Loader | Game versions | Newest |
|---|---|---|
| BepInEx |
From 18 recorded builds of S1API.
Recent builds
| Build | Released | Game versions | Loaders |
|---|---|---|---|
| 1.6.2 | 2025-04-29 | n/a | BepInEx |
| 1.5.1 | 2025-04-29 | n/a | BepInEx |
| 1.5.0 | 2025-04-28 | n/a | BepInEx |
| 1.4.4 | 2025-04-28 | n/a | BepInEx |
| 1.4.3 | 2025-04-28 | n/a | BepInEx |
| 1.4.2 | 2025-04-28 | n/a | BepInEx |
Dependencies
- Required: MelonLoader
Declared by the newest build that lists any. Required ones are installed with it on one-click installs.
What kind of mod it is
From the catalogLibraries & compatibility
Foundations and fixes other mods build on. Usually installed because something else needs it.
Compatibility
- Game
- Schedule I
- Loaders
- BepInEx
- Requires
- One-click install needs a BepInEx server. 1 other project installed alongside it.
Verified at the source
- ✓ThunderstoreOfficial listing, checked 2026-10-02Open ↗
- ✓AuthorKaBooMa, as published on Thunderstore
- ✓LicenseNot published by the sourceFree
