Software that does
the hard part for you.
Deus Core is a studio building small, focused apps that make everyday things easier — music tools, games, and handy utilities. Simple to buy, simple to use, one download each.
See our productsProducts
What we make
Small, focused apps that each do one thing well — no clutter.
GN Pianist
Windows appTurns piano videos and MIDI files into playable sheets, then plays them for you on any QWERTY virtual piano — Roblox, virtualpiano.net, and more.
View GN Pianist →Karaoke Queue!
Web appA karaoke night without the fuss. Put it on the TV, guests scan a QR code and add songs from their phones, and everyone can see who's singing next. Nothing to install.
Pro: 40 guests · 200 songs · 5 host remotes · tournament mode (coming soon) · See Pro
More coming
In the worksNew Deus Core tools are in development. Check back soon.
Coming soonAbout
Deus Core
Deus Core is a one-person studio turning ideas into focused, affordable apps that each do one thing well. It started with GN Pianist, then came Karaoke Queue! — and there's plenty more on the way, from games to everyday tools.
Support & legal
Help, policies and contact
Questions, billing, or a copyright concern? Everything goes to one inbox, and a real person reads it.
Get help
Something not working, a question about a purchase, or a refund request? Email us and include which app it's about.
[email protected]Policies
The rules for using our apps, what we store, and how copyright complaints are handled.
Copyright notices
Our apps don't host or sell any music. If you believe something reachable through one of them infringes your copyright, send a notice to our copyright agent.
How to send a notice →