Undertale: 2 Open Source Clones Compared
The "undertale" repository is a small, largely unmaintained source dump — its own README says someone sent the uploader the code and calls it "most likely decompiled," with just two contributors and halted development. UndertaleModTool is a different kind of project: an actively maintained tool (85 contributors) for decompiling, unpacking, and modding Undertale and other GameMaker games, rather than a standalone playable clone.
Comparison table
Availability
- Status
- —
- Platforms
- Windows, Linux, OSX
- Play in browser
- No
- Mobile
- No
Project health
- Development status
- Active
- Last updated
- 8d ago
- Stars
- 2,049
- Contributors
- 85
- License
- GPL-3.0
- Engine
- GameMaker
Availability
- Status
- Unplayable
- Platforms
- None
- Play in browser
- No
- Mobile
- No
Project health
- Development status
- Halted
- Last updated
- 8y ago
- Stars
- 244
- Contributors
- 2
- License
- —
- Engine
- —
| Title | UndertaleModTool | undertale |
|---|---|---|
| Status | — | Unplayable |
| Platforms | Windows, Linux, OSX | None |
| Play in browser | No | No |
| Mobile | No | No |
| Project health | ||
| Development status | Active | Halted |
| Last updated | 8d ago | 8y ago |
| Stars | 2,049 | 244 |
| Contributors | 85 | 2 |
| License | GPL-3.0 | — |
| Engine | GameMaker | — |
| Preview | |
Frequently asked questions
Are the Undertale clones on this page open source?
Yes — every clone catalogued here is an open-source project. Availability, license, and development-status details for each one are listed in the comparison table above.
What license do these Undertale clones use?
UndertaleModTool (GPL-3.0).
Which Undertale clone is the most actively maintained?
UndertaleModTool is currently under active development, based on recent commit activity. See the "Development status" row above for every clone's current status.
See the full write-up for each clone, or go back to Undertale.