Pymss vs TuneStems

Pymss is an open-source music source-separation toolchain that runs on the user's own machine and separates audio into vocals, drums, bass, and other stems. Its Studio desktop workspace handles model management, batch jobs, and stem editing. Users can import files or folders, choose a downloaded model, configure inference, and queue work. Studio can browse, download, resume, and delete model files, with storage cleanup controls. Waveform previews, mix controls, saved projects, and stem export support work on the results. Pymss can chain models so each workflow step uses the preceding step's output. The inference package lists WAV, FLAC, MP3, M4A, AAC, Opus, Vorbis, and Ogg output. Other components include ComfyUI custom nodes, a VST3 ARA plugin for compatible DAWs, and a browser interface bundled with the server. The ARA plugin provides per-stem mute and solo controls; its README gives Reaper and Studio One as host examples. The repositories have separate licenses: Studio is listed under AGPL-3.0 and the inference package under MIT. Studio remains at an early development stage, and changes between versions may break things.

TuneStems separates songs into vocals, drums, bass, guitar, piano and other instrument stems through a web service. Its modes include 6-Stem Separation, Vocals / Instrumental, Extract One Instrument and All-In Ensemble. The site describes uses such as remixing, DJ edits, music practice, creator clips, production preparation and song analysis. Users can preview each stem in the results area or a share view, then download individual stems in MP3, WAV, FLAC or M4A. The homepage lists audio and video uploads, including MP3, WAV, FLAC, MP4 and MOV, with a stated limit of 100 MB and five minutes; plan details give different file limits. TuneStems says it can be tried without sign-up for up to five minutes per track. The Free plan is free and includes 151 welcome credits, but downloads unlock after a purchase. Paid plans include a 5.90 USD one-time Starter Pack. The service is operated by BMTech Nexus LLC, a United States-based team, and is headquartered in Sheridan, Wyoming, United States.