GPU engine by default
A Direct3D 11 stage on its own thread with HDR, bloom and a frame-rate target up to 240 FPS; the WPF renderer became the fallback.
Download
One download, every feature
Keyflow is free and MIT licensed. Take the installer for the shortest path, or a portable ZIP if you would rather not install anything. Every package contains the same application, the same Yamaha grand SoundFont and the same two languages.
v1.0.0
Latest release
Keyflow 1.0.0 · Concert Grand Edition
Published 2 October 2026. Four packages, one checksum file, and the same application in every one of them.
Windows 10 / 11 · x642 Oct 2026MITEN · VI
Packages
Pick the one that suits your machine
Recommended
Installer for Windows x64
Keyflow-Setup-1.0.0.exe
Start Menu and Desktop shortcuts, an uninstall entry, and a wizard in English and Tiếng Việt. Nothing else to install: the .NET runtime is inside the package.
Download the installerWindows 10 / 11 · x6483.2 MiBv1.0.02 Oct 2026
Portable, self-containedUnzip the whole folder and run PianoPath.exe — never separate the .exe from its folder. ZIP · x64
Framework-dependentMuch smaller, but the target PC needs the .NET 10 Desktop Runtime (x64). ZIP · small
ChecksumsSHA-256 for every file in the release — the only way to be sure nothing changed on the way. SHA256SUMS.txt
Everything in the release
Four packages and a checksum file
| Download | What it is | Target PC needs | Size |
|---|---|---|---|
| Installer (recommended) Keyflow-Setup-1.0.0.exe | Windows x64 installer: shortcuts, an uninstall entry, an English/Vietnamese wizard. | Nothing else | 83.2 MiB |
| Portable ZIP Keyflow-1.0.0-win-x64.zip | Self-contained: unzip and run PianoPath.exe. | Nothing else | 117.2 MiB |
| Framework-dependent ZIP Keyflow-1.0.0-win-x64-fd.zip | The same application, far smaller, without the bundled runtime. | .NET 10 Desktop Runtime (x64) | 54.9 MiB |
| Windows on ARM ZIP Keyflow-1.0.0-win-arm64.zip | Self-contained ARM64 build, published by CI; no ARM machine has run it yet. | Nothing else | 105.2 MiB |
| Checksums SHA256SUMS.txt | SHA-256 for every file in the release. | PowerShell Get-FileHash | 375 B |
The download buttons on this site move to the newest release by themselves when GitHub answers; the links above are pinned to v1.0.0 so they work offline too.
Installing
Two minutes, and one folder you should not break
- Run the installer and follow the wizard — it offers English and Tiếng Việt, creates the shortcuts and adds an uninstall entry.
- Using a ZIP instead? Unzip the whole folder and run PianoPath.exe from inside it. The SoundFont has to sit next to the executable, and the licence files travel with it.
- Keep LICENSE.txt (MIT) and Assets\ATTRIBUTION.txt (the SoundFont's CC BY 3.0) when you pass a copy on to somebody else.
{'html': '
Inside the portable ZIP
Keyflow-1.0.0-win-x64\\\n├── PianoPath.exe ← the single executable\n├── LICENSE.txt ← MIT, must travel with copies\n└── Assets\\\n ├── ConcertGrand.sf2 ← the ~113 MiB SoundFont, next to the .exe\n └── ATTRIBUTION.txt ← FreePats credit, CC BY 3.0', 'kind': 'raw'}
Windows SmartScreen will warn you once
The packages are not code-signed, so the first launch shows “Windows protected your PC”. Choose More info, then Run anyway. Signing is on the project's list; until then, the checksum is how you confirm the file you received is the file the pipeline built.
Checking a download
Compare the hash against SHA256SUMS.txt
PowerShell
# what you received Get-FileHash .\Keyflow-Setup-1.0.0.exe -Algorithm SHA256 # what the release says it should be Get-Content .\SHA256SUMS.txt
The two hashes have to match exactly. A mismatch means the download was altered or truncated — delete it and take the file from the release page again.
System requirements
What your machine needs
| Component | Requirement | Notes |
|---|---|---|
| Operating system | Windows 10 (22H2 recommended) or Windows 11, 64-bit | The app uses WPF and WinMM, so it runs on Windows only. |
| Running a packaged build | Nothing extra for the self-contained builds; the framework-dependent one needs the .NET 10 Desktop Runtime (x64) | The installer and the x64/ARM64 ZIPs are self-contained. |
| Graphics | A GPU with Direct3D 11 (feature level 11_0 or newer, shader model 5.0) | Keyflow tries the card first, then WARP — the same shaders in software — and finally the WPF renderer, saying why in General → GRAPHICS ENGINE. |
| Audio | Any sound card Windows recognises (waveOut output) | With no output device the engine renders the audio itself, so recordings keep their full length. |
| MIDI (optional) | A USB piano or controller Windows recognises | Without one you still play with the computer keyboard or the on-screen piano. |
| Camera (optional) | A webcam, or a video file for the overlay | Frames are read through Media Foundation, which Windows ships. |
| Disk | ~300 MB for a self-contained install | Building from source needs about 1.5 GB for the .NET 10 SDK plus 500 MB for sources and output. |
| Building from source | .NET 10 SDK (10.0.100 or newer), Git and Git LFS | The ~113 MiB SoundFont is stored through Git LFS. Visual Studio 2026 with the .NET desktop workload, or VS Code with the C# Dev Kit. |
What is in 1.0.0
The first official release
One entry in the changelog describes the product as released — these are the parts a user meets first.
Shading every frame
The 88-key keyboard is shaded in HLSL on the GPU stage, with the dock's sliders applied per frame.
MP4 with the sound inside
Media Foundation writes H.264 video and AAC audio into one file, with a bitrate derived from size and frame rate.
A staff layer on the stage
Key signature inferred from the song, beaming, rests, ties, chords as one column and hand-change curves.
Library, history and ghost
A folder library with tags and a watcher, per-run practice history, a fourteen-day chart and your best take drawn as a ghost.
Themes you can build
A theme studio deriving twenty tokens from five colours, a community preset shelf, rendered preset thumbnails and one-line share codes.
Two languages, checked
English and Tiếng Việt switch live, the dock search answers in both, and a static check proves the tables carry the same keys.
Accessibility & verification
Named glyph buttons, Tab cycling inside the dock, Windows high contrast support, and a verification suite you can run yourself.
Four packages
An installer, a self-contained ZIP, a framework-dependent ZIP and an ARM64 ZIP, each with SHA-256 checksums.
Before you install
Download questions
Which package should I take?
The installer for a normal Windows PC — it is self-contained, so no runtime to install. Take the portable ZIP if you prefer to keep it on a stick or in a folder of your own, the framework-dependent ZIP if you already have the .NET 10 Desktop Runtime and want a smaller download, and the ARM64 ZIP on Windows on ARM — knowing it has not been run on real ARM hardware yet.
Is it really free? Where is the catch?
The code is MIT licensed and the packages cost nothing. There is no account, no sign-in, no telemetry and no upsell inside the app. The bundled piano is FreePats' YDP Grand under CC BY 3.0, credited in every package.
Will my antivirus or Windows complain?
SmartScreen warns once because nothing is code-signed: More info → Run anyway. The release carries SHA256SUMS.txt so you can verify the file yourself, and PianoPath.exe --verify runs the built-in checks on your own machine and prints PASS or FAIL per subject.
Does it work on an old PC with no graphics card?
It runs: Keyflow falls back to WARP, Windows' software rasterizer executing the same shaders, and then to the WPF renderer if Direct3D cannot start. Expect a lower frame rate on heavy presets — a heavy frame costs FPS, never MIDI latency.
Where do I report a bug?
On GitHub Issues. Attach a screenshot, the profile you exported from General → SETTINGS PROFILE, and the log from --verify --verify-log=… — that is usually enough to reproduce it.
Download it, plug in, and play
Keyflow 1.0.0 · 83.2 MiB installer · Windows 10 and 11, 64-bit · MIT licensed.