Cascade is a browser-based osu!mania
beatmap editor, StepMania editor,
Etterna editor, and VSRG map viewer. Import
.osz / .osu files, convert osu to Etterna
or StepMania, chart notes on a vertical scrolling
playfield, set timing, hear real osu! hitsounds, collaborate in
realtime, and export a ready-to-play .osu,
.osz, or .sm map. No download, no install.
What you can do
Edit osu!mania beatmaps online (1K to 18K), with rice notes and long notes
Edit StepMania and Etterna charts in a browser-based ArrowVortex-style workflow
Preview and view osu!mania maps right in the browser
Import .osz / .osu, export .osu, .osz, or .sm
Convert osu!mania maps to Etterna or StepMania-compatible .sm files
Combine multiple maps into one .osz song pack with the Pack Creator
Set BPM and timing with tap tempo and a metronome
Set a background image or a muted background video, like ranked osu! maps
Real osu! hitsounds and .osk skin support
Realtime collaborative mapping with live comments
osu!mania editor FAQ
Is Cascade free to use?
Yes. Cascade is a free online osu!mania editor that runs entirely in your web browser.
Do I need to install anything?
No. It is a web app: open it in any modern browser and start mapping immediately.
Can I import my existing osu!mania beatmaps?
Yes. Drag an .osz or .osu file onto the page to edit an existing map, then export it back out or convert osu to Etterna / StepMania.
Is this a VSRG editor?
Yes. Cascade charts on a standard vertical-scrolling rhythm-game (VSRG) playfield and exports osu!mania .osu / .osz files plus StepMania and Etterna .sm charts.
Is Cascade like ArrowVortex?
Cascade covers similar mania chart editing and conversion workflows in the browser, including osu!mania, StepMania, and Etterna formats.
Can I combine multiple maps into one .osz pack?
Yes. The Pack Creator merges several beatmaps into a single .osz song pack with shared metadata, mapper credits, and generated difficulty names, for local play.