Ohlhorst Digital’s Trama is a free standalone AI stem separator for Windows, macOS, and Linux.
We recently featured StemDeck, a free and open-source local stem splitter that separates a track into up to six parts. Trama has a similar offline approach but focuses on four stems and packages everything into a convenient desktop app.
All you need to do is drop a mixed track into Trama, and it separates the audio into vocals, drums, bass, and other. You can export any combination of those four parts. Unselected parts are merged into one additional file, so you do not have to export stems you will never use.
I like the minimal look of the interface, and I really appreciate the simple setup. There is no account, cloud upload, or separate model download. On Windows, you extract the archive and launch the app directly. The macOS version comes as a disk image, while Linux users extract the binary and make it executable.
Trama uses Meta’s fine-tuned Hybrid Transformer Demucs model, htdemucs_ft. Four separation models are bundled with the application and loaded into memory at launch, which basically allows the complete process to run locally without an internet connection.
You can choose between Normal, High, and Ultra quality presets. Higher settings run more separation passes and average the results, which can produce cleaner stems but unsurprisingly takes longer. Ohlhorst Digital recommends High as a useful default.
For a three-minute song, the developer estimates that High mode takes around one to two minutes with a compatible NVIDIA GPU or 10 to 15 minutes on a CPU. Windows and Linux automatically use CUDA when available, but AMD GPUs are not currently accelerated. Trama uses the CPU on Apple Silicon because its MPS backend is not enabled.
Batch processing lets you queue several tracks, with progress and estimated completion times shown for each file and the complete queue. The app also remembers your stem selection, quality preset, and output folder.
Input support covers WAV, AIFF, MP3, and FLAC. Every stem is exported as a 32-bit floating-point WAV at 44.1 kHz, and audio at other sample rates is resampled during separation. Trama also preserves WAV metadata, including BWF data, cue points, labels, playlists, instrument information, ID3 tags, and Reaper markers.
Trama v1.0.7 supports 64-bit Windows 10/11 and x86_64 Linux. The macOS version requires macOS 12 or later and an Apple Silicon Mac, with no Intel Mac support. Downloads are sizable at roughly 3.1 GB for Windows, 500 MB for macOS, and 3.9 GB for Linux because the required models and libraries are bundled.
Download: Ohlhorst Digital Trama (FREE)
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Last Updated on August 22, 2026 by Tomislav Zlatic.
