Asteria Sprite
Pixel art and animation.
Open Sprite
AsteriaBox
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. Asteria Box is free and open source, like BeepBox itself.
Made in Asteria Box
Freely Given
Eight tracks · Asteria Technology · 2026
First Light
Download
Work with your agent
Ask your agent
Asteria Box 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 Asteria Box. Get it from https://github.com/mundusnovus/Asteria Box (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 Asteria Technology
Asteria Cloud
3 GB for your files, saved from every app.
Open CloudEverything, downloadable
Every app for every platform, with checksums.
Downloads