Lönn

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What Lönn is

Lönn is a visual level maker and editor for Celeste. It can edit existing map binaries or create new maps, add rooms, and place game objects. Its editing tools include object placement and selection, tiles and brushes, layers, and stylegrounds. The project describes support for 2D levels, tilemaps, and entity placement. Maps made with Lönn can be loaded in the stock game or with Everest; the project recommends Everest.

Lönn is free and runs on Linux, macOS, and Windows. Windows and macOS releases are downloadable ZIP files. On Linux systems that support AppImage, users can download and run that release; other operating systems require LÖVE 11.3 or later. Mod developers can make compatible plugins available in Lönn by adding them to their mods, and the project wiki includes technical guides for writing plugins for entities and triggers.

The project is under active development and is an unofficial fan project, not developed by or connected with the Celeste development team. It cannot currently save every part of original Celeste maps back, estimating coverage at about 99%; the README recommends making backups. Source code and assets are MIT-licensed except for stated exceptions. The logo is reserved and may only be distributed with original copies of the software.

Who it suits

Lönn suits people making or editing maps for Celeste, including mod developers who want compatible plugins to appear in the editor. It is also a fit for users who want tools for rooms, tiles, objects, layers, or stylegrounds across Linux, macOS, or Windows.

What it does well

Edits existing Celeste map binaries and creates new maps.
Includes tools for tiles, brushes, layers, and stylegrounds.
Places rooms and game objects.
Runs on Linux, macOS, and Windows.
Free to use.

What to know first

Cannot save 100% of original Celeste maps back.
Other operating systems require LÖVE 11.3 or later.
Mod content requires compatible plugins added to the mods.
It is an unofficial fan project, separate from the Celeste development team.

Limits

Lönn estimates that it can save back about 99% of original Celeste maps, not all of them, and recommends making backups.

Getting started

Download the Windows or macOS ZIP release, or use the Linux AppImage if your system supports it.
For other operating systems, use LÖVE 11.3 or later.
Open or create a map, then add rooms and place game objects.
Load the resulting map in the stock game or with Everest.
For mod content to appear, add compatible Lönn plugins to the mod.

Verdict

Choose Lönn if you are making Celeste maps and want a free visual editor with tools for rooms, tiles, objects, and layers. Look elsewhere if your workflow depends on saving every part of an original Celeste map back, or if you need a project developed by the Celeste team.

Questions

Is Lönn free?

Yes. The project lists Lönn as free.

Which operating systems does it support?

It lists Linux, macOS, and Windows. Other operating systems require LÖVE 11.3 or later.

What can I make or edit with Lönn?

It can edit existing map binaries, create maps, add rooms, and place game objects. Its tools cover tiles, brushes, layers, and stylegrounds.

Can maps made in Lönn be used in Celeste?

They can be loaded in the stock game or with Everest. The project recommends Everest.

Is Lönn an official Celeste project?

No. It is an unofficial fan project and is not developed by or connected with the Celeste development team.

What license does Lönn use?

Its source code and assets are MIT-licensed except for stated exceptions. The logo is reserved and may only be distributed with original copies of the software.

Facts from Lönn's own pages

Audience: The project is intended for people making maps for Celeste, including mod developers who add compatible plugins. · github.com, 8 Oct 2026
Development status: The project describes itself as under active development. · github.com, 8 Oct 2026
Editing tools: The README documents tools for placing and selecting objects, working with tiles and brushes, editing layers, and changing stylegrounds. · github.com, 8 Oct 2026
Game compatibility: Maps created by Lönn can be loaded in the stock game or with Everest, which the project highly recommends. · github.com, 8 Oct 2026
License: The README says the source code and most assets are licensed under the MIT license, with exceptions including the logo. · github.com, 8 Oct 2026
Linux distribution: On systems that support AppImage, users can download and run the AppImage release. · github.com, 7 Oct 2026
Map editing: It can edit existing map binaries, create new ones, add rooms, and place game objects. · github.com, 7 Oct 2026
Map preservation limit: The README says Lönn cannot currently save 100% of original Celeste maps back, estimating support at about 99%, and recommends making backups. · github.com, 8 Oct 2026
Other operating systems: For other operating systems, Lönn requires LÖVE 11.3 or later; the README also describes launching an AppImage on systems that support it. · github.com, 8 Oct 2026
Platforms: The installation instructions cover Windows, macOS, and other operating systems using LÖVE 2D version 11.3 or later. · github.com, 7 Oct 2026
Plugin documentation: The project wiki provides technical documentation for writing Lönn plugins, including guides for entities and triggers. · github.com, 7 Oct 2026
Plugins: Mod developers can add compatible Lönn plugins to their mods, and the project wiki documents plugin development. · github.com, 8 Oct 2026
Plugin support: Mod developers need to add compatible Lönn plugins to their mods for them to appear in Lönn. · github.com, 7 Oct 2026
Project relationship: Lönn is an unofficial fan project and is not developed by or connected with the Celeste development team. · github.com, 7 Oct 2026
Purpose: Lönn is a visual level maker and editor for Celeste that can edit map binaries, create maps and rooms, and add objects to rooms. · github.com, 8 Oct 2026
Save limitation: The README says Lönn cannot currently save 100% of original Celeste maps back and estimates coverage at about 99%. · github.com, 7 Oct 2026
Security: The opened project README and wiki pages do not state security certifications or compliance claims. · github.com, 7 Oct 2026
Support: The project asks users to report bugs and directs questions to the #map_making channel on the Mt. Celeste Climbing Association Discord server. · github.com, 8 Oct 2026
Unofficial project: Lönn is described as an unofficial fan project and says it is not developed by or connected to the Celeste development team. · github.com, 8 Oct 2026
Windows and macOS: The installation instructions provide Windows and macOS releases as downloadable ZIP files. · github.com, 8 Oct 2026

Where Lönn stands on Freedom251

Game Level Editors#18 of 28