Direct3D 11 GPU stage
An independent render loop with 16-bit HDR, multi-level bloom and up to 24,000 particles. A heavy frame costs frame rate, never MIDI latency.
Piano performance & concert VFX studio
Your MIDI, on a concert stage.
Play, practise and record piano videos at production quality. Notes fall in time, sparks glow hot and fade, and an 88-key keyboard is lit by a ray-traced shader, all drawn on your GPU without ever holding up your MIDI input.
- Free & open source
- Windows 10 / 11
- English & Tiếng Việt
240FPS GPU stage
16-bitHDR with bloom
14stage presets
88ray-traced keys
What it does
Everything a piano video needs, in one window
Ray-traced keyboard
GGX lighting, a softbox with real penumbra, contact shadows and coloured light thrown back by the keys you press.
Fire, sparks & light
Incandescent sparks, per-note flames, impact waves and hit-line styles, plus aurora, nebula and ember-haze backgrounds.
Practice that listens
Follow along, wait for your note, practise one hand, loop a passage with A-B and slow it down to 50%.
Record in one click
MP4 (H.264 + AAC) with the sound already inside, AVI, or a 32-bit PNG sequence with transparency for Premiere, Resolve and OBS.
Your instrument, your sound
Plug in a MIDI keyboard or use the computer keys. A bundled Yamaha grand SoundFont, hall reverb and all three pedals included.
Scores in, looks out
Open MIDI and MusicXML files, share a whole look as one line of text and swap between Concert Grand, Noir and Velvet Gold.
Camera & hand tracking
Overlay a webcam with green-screen keying, and see which key your hand is over, with no model to download.
Two languages, live
Switch between English and Tiếng Việt without a restart: every label, dialog and error repaints in the same frame.
Gallery
Rendered by the app itself
Every picture here is captured by Keyflow in CI, not staged artwork.
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Galaxy Voyage: rainbow trails over a cosmic layer -
Electric Storm: speed lines and arcs between held keys -
Neon Violet: the default stage -
Your own picture behind the keys -
The Concert Grand start menu -
Stage design dock: presets and every layer -
Three concert interfaces, plus themes you make -
Recording: MP4, AVI or PNG with alpha -
Practice: follow along, wait for my note, one hand -
Practice history
Practice mode
Learn a piece, note by note
- The score waits for the right note before it moves on.
- Right-hand-only or left-hand-only, read straight from MusicXML staves.
- Loop any passage with A-B and slow it down to 50% tempo.
- Live accuracy, streak and timing feedback under the stage.
Get started
Up and playing in a minute
- DownloadGrab the portable ZIP or the installer from the latest release.
- Plug in & openConnect a MIDI keyboard, or just press A W S E D F on the computer keys.
- Pick a lookChoose a preset in Settings, then press REC to make your video.
System requirements
- System
- Windows 10 (22H2) or Windows 11, 64-bit
- Graphics
- Direct3D 11 GPU (falls back to WARP, then to the WPF renderer)
- MIDI
- Optional: any USB keyboard Windows recognises
- Build from source
- .NET 10 SDK, Git, Git LFS
The app is not code-signed, so Windows SmartScreen may warn you the first time: choose “More info”, then “Run anyway”.