Circinus Mod Manager
What Circinus Mod Manager is
Circinus Mod Manager is a free desktop app for arranging RimWorld mods before starting the game. Its HALO system sorts mods into eight phases according to their contents and explains each placement. Users can add their own sorting rules, and the app identifies conflicts between rules so they can be resolved. Pre-launch checks look for missing dependencies, declared incompatibilities, misplaced definitions, duplicates, and texture collisions. The manager can import lists from ModsConfig.xml, save files, Steam collection links, RimSort exports, rentry pages, and clipboard contents. Workshop downloads use SteamCMD in a queue that can pause when Steam slows down, retry failures, and resume after the app closes. Sorting and checks can run on files already on disk; community databases stay off until enabled. The project supports Windows, Apple Silicon Macs, and Linux. Mac requires M1 or newer, while Linux uses an AppImage for 64-bit distributions. The project describes itself as independent and community-run, and unaffiliated with Ludeon Studios.
Who it suits
Circinus Mod Manager suits RimWorld players who want help sorting and checking mod lists before launch. It is available for Windows, Apple Silicon Macs, and Linux, with specific system requirements for Mac and Linux.
What it does well
- Sorts mods into eight explained phases.
- Checks dependencies, incompatibilities, duplicates, and texture collisions.
- Imports lists from several file and link types.
- Workshop downloads can resume after the app closes.
- Works with local files while community databases remain off.
What to know first
- Mac requires an M1 or newer.
- Intel Macs are unsupported.
- The macOS build is not signed with an Apple certificate.
- Linux uses an AppImage for 64-bit distributions.
Limits
The app is free. Intel Macs are unsupported, and the macOS build requires clearing quarantine on first launch; Linux uses an AppImage for 64-bit distributions.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Circinus Mod Manager | Free desktop app for RimWorld · Windows, Apple Silicon Macs, and Linux | Free |
As circinus.sh lists them, read 11 Oct 2026. The maker's own page has the final word.
Getting started
- Open the Circinus Mod Manager website.
- Choose the build for Windows, an Apple Silicon Mac, or Linux.
- Install or launch the desktop app; on macOS, clear quarantine for first launch.
- Import a mod list or work with files already on disk.
- Review HALO placements and resolve any flagged rule conflicts.
- Enable community databases if you want to use them.
Verdict
Circinus Mod Manager combines mod ordering, pre-launch checks, list imports, and queued Workshop downloads in a free desktop app. Mac users need Apple Silicon, and first launch on macOS requires clearing quarantine because the build is not signed with an Apple certificate.
Questions
How much does Circinus Mod Manager cost?
It is free, with a listed plan price of $0.
Which operating systems does it support?
It supports Windows, Apple Silicon Macs, and Linux. The Mac build requires M1 or newer; Linux uses an AppImage for 64-bit distributions.
Can it work without community databases?
Yes. Sorting and checks can use files already on disk, and community databases stay disabled until enabled.
What can it check before launching RimWorld?
It checks for missing dependencies, declared incompatibilities, misplaced definitions, duplicates, and texture collisions.
How can I import a mod list?
Import sources include ModsConfig.xml, save files, Steam collection links, RimSort exports, rentry pages, and clipboard contents.
Who makes Circinus Mod Manager?
It is an independent, community-run project unaffiliated with Ludeon Studios.
Facts from Circinus Mod Manager's own pages
- Conflict detection
- It flags mods that share textures, patch the same definition, or hook the same method, and identifies which one takes effect. · circinus.sh, 11 Oct 2026
- Custom rules
- Users can override HALO with their own rules, and the app identifies conflicting rules so one can be removed and sorting can finish. · circinus.sh, 11 Oct 2026
- Download verification
- Each download lists a SHA-256 fingerprint that users can compare against the downloaded file. · circinus.sh, 11 Oct 2026
- Free plan
- Yes · circinus.sh, 23 Sept 2026
- Imports
- It can import mod lists from ModsConfig.xml, save files, Steam collection links, RimSort exports, rentry pages, and clipboard contents. · circinus.sh, 11 Oct 2026
- Limit
- The macOS build is not signed with an Apple certificate yet, so first launch requires clearing macOS quarantine; Intel Macs are unsupported. · circinus.sh, 11 Oct 2026
- Load order
- Its HALO system sorts mods into eight phases based on mod contents and explains why each mod is placed where it is. · circinus.sh, 11 Oct 2026
- Mod source access
- external links · circinus.sh, 23 Sept 2026
- Offline use
- Sorting and checking work from files already on disk, and community databases stay off until users enable them. · circinus.sh, 11 Oct 2026
- Pre-launch checks
- It checks for missing dependencies, declared incompatibilities, misplaced definitions, duplicates, and texture collisions. · circinus.sh, 11 Oct 2026
- Privacy
- The manager works with files kept locally, and sharing data with the site is off unless the user turns it on. · circinus.sh, 11 Oct 2026
- Project status
- Circinus describes itself as an independent, community-run project unaffiliated with Ludeon Studios. · circinus.sh, 11 Oct 2026
- Purpose
- Circinus Mod Manager is a desktop app for arranging RimWorld mods before starting the game. · circinus.sh, 11 Oct 2026
- Support
- The independent project has one human-read inbox, no ticket system or autoresponder, and says replies usually arrive within a day or two. · circinus.sh, 11 Oct 2026
- Supported platforms
- multi-platform · circinus.sh, 23 Sept 2026
- Supported systems
- The manager is available for Windows, Apple Silicon Macs, and Linux; the Mac build requires M1 or newer and Linux uses an AppImage for 64-bit distributions. · circinus.sh, 11 Oct 2026
- Updates and signatures
- The app checks for a newer version at startup, asks before installing it, and refuses updates whose signatures do not verify. · circinus.sh, 11 Oct 2026
- Workshop downloads
- Workshop mods download through SteamCMD in a queue that pauses when Steam slows down, retries failures, and resumes after the app closes. · circinus.sh, 11 Oct 2026
Where Circinus Mod Manager stands on Freedom251
- Mod managers#14 of 78
- Game Mod Managers#17 of 79