MNSprite
Pixel art and animation.
Open Sprite
MNBox
Write music, from chiptune to a whole band. The Composer writes with you, and every change can be undone.
What it does
A band
Distorted and clean guitars, bass, organ, strings, choir, piano, bells and a real drum kit.
Riffs
Power chords that chug, gallop or push, and a pulse bass that hammers.
A mix that balances itself
Auto mix listens to each part and sets the volumes against the lead.
Ready to share
Mastered MP3s with even loudness, title tags and cover art. WAV, MIDI and seamless game loops too.
The Composer
Describe a song and it writes one, or asks before it changes yours. It works with your own Anthropic key. Or ask your own agent.
Built on BeepBox
Every BeepBox song opens here. MNBox is free and open source, like BeepBox itself.
Made in MNBox
Freely Given
Eight tracks · Mundus Novus · 2026
First Light
Download
Work with your agent
Ask your agent
MNBox comes with instructions for AI agents. An agent that can run code can use the same tools as the editor's own assistant, and hand you a file you can open here and keep working on.
- Claude. In the Claude desktop app, open Cowork, give it a folder to work in, and paste the prompt.
- ChatGPT. Start a task in agent mode, or in Codex, and paste the prompt.
- Change the last sentence to say what you want. Then open the file it gives you in the editor.
Make me a song with MNBox. Get it from https://github.com/mundusnovus/MNBox (download the ZIP or clone it), read AGENTS.md in it, and follow it. Here is what I want: a two-minute rock song in E minor at 160 bpm, with distorted guitars, an organ and a choir. When you are done, give me the .beepbox song and a WAV.
Also from Mundus Novus
MNCloud
3 GB for your files, saved from every app.
Open CloudEverything, downloadable
Every app for every platform, with checksums.
Downloads