Lönn review
A free, open-source editor focused on building and modifying Celeste maps.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Lönn is an open-source visual map maker and level editor for Celeste. It is designed for creators who want to edit existing map binaries or build new maps and rooms. The editor supports placing and editing game objects and entities, painting foreground and background tiles with brushes, and saving maps for use in the stock game or with Everest. Desktop packages are available for Windows and macOS, with packages and launch instructions for Linux and other operating systems.
Lönn’s main strength is the breadth of its Celeste-focused editing tools. Users can select, move, resize, rotate, and flip objects; configure layers and layer groups; edit stylegrounds; and undo or redo editing actions. This gives map creators control over both room structure and visual presentation rather than limiting the tool to tile placement. Plugins provide a way to extend the editor’s functionality, while the project’s open-source model keeps the software free to use.
The ecosystem fit is centered on Celeste and Everest. Lönn can save maps for the stock game, while Everest is the listed integration and is recommended for loading custom maps. That makes the editor a focused choice for Celeste creators rather than a general-purpose level design tool. Choose Lönn if you need a free desktop editor for Celeste maps, including binary editing, entity placement, tile painting, layers, and stylegrounds. Consider another tool if your work is outside Celeste or requires a broader, multi-game editing workflow.
Lönn pros and cons
- Where it wins
- Creates rooms and edits existing Celeste map binaries
- Supports tiles, objects, entities, layers, and stylegrounds
- Free, open-source desktop software with Everest integration
- Where it doesn't
- Focused specifically on Celeste map creation
- Everest is recommended for loading custom maps
- Unofficial fan-made project rather than an official Celeste tool
Lönn fact sheet, pricing and score →
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