S1MAPI
🟡 Updated this yearPreview

🔍 Analysis
- 👍 0.5% endorsement rate
- 🏆 #32 of 161 Utilities mods in this game by downloads
📋 About This Mod
S1MAPI - Schedule One Modding API
What is S1MAPI?
S1MAPI is a comprehensive building framework and modding API designed specifically for Schedule One. It provides a robust foundation for creating custom buildings, interiors, and game modifications with an easy-to-use, component-based architecture.
Perfect for modders who want to add custom structures and gameplay features without the hassle of asset bundles!
Who Needs This?
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[]Players: Only if you're using mods that declare MAPI as a requirement[/]
[]Mod Developers: If you want a robust, component-based building framework and mapping API for Schedule One[/]
Key Features
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[]Building System: Complete building framework with support for walls, furniture, lighting, and structural elements[/]
[]Component Architecture: Modular component system for reusable building pieces and custom functionality[/]
[]Procedural Meshes: Generate custom meshes programmatically with support for primitives and advanced mesh operations[/]
[]GLTF Importing: Built-in GLTF model loading and processing for importing custom 3D assets[/]
[]Extension Methods: Comprehensive extension methods for Unity components, transforms, materials, and more[/]
[]Configuration System: Flexible configuration system with palette support for building presets[/]
[]Game Integration: Seamless integration with Schedule One's materials, meshes, and prefabs[/]
Installation
For Players:
If a mod you want to use requires S1MAPI:
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[]Download the S1MAPI zip from the Files section[/]
[]Extract the zip - it contains both S1MAPI-Mono.dll and S1MAPI-Il2Cpp.dll[/]
[]Copy the correct DLL for your Steam branch to your game's UserLibs folder:
[]Regular Steam branch (default): Use S1MAPI-Il2Cpp.dll[/]
[]Alternate Steam branch: Use S1MAPI-Mono.dll[/]
[]Launch the game - S1MAPI will load automatically with MelonLoader[/]
To check your Steam branch: Right-click Schedule One in Steam → Properties → Betas. If it shows "None" or no selection, you're on the regular branch (use Il2Cpp).
For Mod Developers:
To use S1MAPI in your mod project:
[]Add the Mono S1MAPI DLL as a reference to your mod project (via NuGet or direct DLL reference)[/]
[]Build your mod against the Mono DLL - it will work on both runtimes[/]
[*]Users wi
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[]Download the S1MAPI zip from the Files section[/]
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[]Building System: Complete building framework with support for walls, furniture, lighting, and structural elements[/]
S1MAPI is a comprehensive building framework and mapping API for Schedule 1 that lets you create custom buildings, interiors, and load custom models without asset bundles. It's a utility mod for modders and players who want to expand the game's building possibilities. With 60 endorsements and 12,837 downloads, it's a niche but actively used tool.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Solid download count (12,837) shows real interest from the community
- Removes the need for asset bundles, which is a huge pain point for modders
- Opens up creative possibilities for custom buildings and interiors
⚠️ Cons
- Low endorsement ratio (60) compared to downloads, so it might not be as polished or user-friendly as some alternatives
- As an API, it's not for casual players – you'll need modding knowledge to use it effectively
- Potential compatibility issues with other mods that alter building or map systems
For Schedule 1 modders who want to create custom buildings and interiors without wrestling with asset bundles. Also for players who want to install mods that rely on this framework. Skip if you're looking for gameplay tweaks – this is a backend utility.
💡 Beginner Tips
- If you're new to modding Schedule 1, check the mod's page for any dependencies or load order notes before installing.
- Since this is an API, look for other mods that use it to see examples of what you can build.
- Make sure your game is updated to a compatible version, as API mods often break with game patches.
📊 Mod Details
- Game
- Schedule1 Mods
- Author
- Bars Studio
- Version
- 2.0.1
- Downloads
- 12,837
- Endorsements
- 60
- Category
- Utilities
- Created
- 1/8/2026
- Updated
- 7/23/2026
🧩 Commonly Used Together
Users add these mods to the same collections — a real compatibility signal, not an AI guess.
🔧 How to Install Schedule I Mods
Download from Nexus Mods.
📖 Full step-by-step install guide for Schedule I →
Visit the official mod page for specific installation instructions for this mod.
🎮 Need cheat codes or console commands? Check ur gaming wiki for Schedule I commands, item IDs, and more.
Keep browsing — more Schedule I mods await