Pymss
Pymss: A local separation workspace with batch tools, model management, and four core stems. Ranked #6 of 21 in Stem Separation Software by our editors (8.9/10); pricing: Free plan; best for open-source users wanting a full separation workspace.
At a glance
- Editor score8.9 / 10
- PricingFree plan
- Best forOpen-source users wanting a full separation workspace
- Free planYes
- Paid fromFree
- Stem typesvocals, drums, bass, other
- Facts checked19 Sep 2026
Where it wins
- Manage models, preview and edit stems, and export from a desktop workspace.
- Batch-process files or folders and chain models with workflow pipelines.
- Use web, command-line, API, DAW-plugin, ComfyUI, and mobile-related components.
Where it doesn't
- Documented core stem types are vocals, drums, bass, and other.
- Its components span multiple open-source repositories rather than one hosted service.
- Local workflows may not suit buyers seeking a hosted subscription service.
Our verdict on Pymss
Pymss is an open-source music source separation toolchain for producers, researchers, and others who need to split recordings into stems. It combines desktop, browser, command-line, DAW-plugin, ComfyUI, and mobile-related components, with WebUI and server API options also described. The product is a fit for people who want a flexible workspace around separation rather than only a single file-conversion step. Its documented default stem examples are vocals, drums, bass, and other, so it is less suited to buyers whose work depends on a broader named stem set.
Workflow breadth is a defining part of Pymss. The desktop workspace supports model management and stem editing; users can preview and mix stems, then export them in WAV, FLAC, MP3, M4A, AAC, Opus, Vorbis, and OGG. Batch processing covers audio files or folders, and pipelines can chain processing models. The model library supports local downloads and management, while command-line inference and scripting offer another route for repeatable workflows. DAW via ARA plugin and ComfyUI are the listed integrations. This range makes Pymss relevant to users who want to connect separation with editing, automation, and other production steps.
Pymss is presented as locally run open-source software distributed across repositories, not as a hosted subscription service. That distinction matters: it suits users comfortable choosing and working with its desktop, web, command-line, or server components, and it is less suited to buyers seeking a single hosted service. The published feature set includes both a free plan and API access, alongside server workflows. Its combination of local model management, batch work, and export makes it a broad workspace, but the documented stem coverage remains focused on four core types. Choose Pymss for an open-source workflow spanning separation and downstream handling; consider another option if hosted simplicity or wider stem coverage is central.
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Pymss pricing
Pymss fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Stem types | vocals, drums, bass, other |
| Max upload size | Not verified |
| Max track length | Not verified |
| Batch processing | Yes |
| Export formats | WAV, FLAC, MP3, M4A, AAC, Opus, Vorbis, OGG |
| Desktop app | Yes |
| API access | Yes |
| Deployment | Cloud, Desktop, Mobile |
| Platforms | Web, Windows, macOS, Linux, iOS, Android |
| Integrations | 2 integrations: DAW via ARA plugin, ComfyUI |
| Pricing | Free plan |
| Website | pymss.net |
| Facts checked | 19 Sep 2026 |
Pymss integrations
Pymss lists 2 integrations on its own site.
- DAW via ARA plugin
- ComfyUI
Alternatives to Pymss
- FadrA free starting point for stem separation, remix tools, MIDI detection and API workflows.9.4
- LALAL.AIFlexible stem separation with web, app, plugin, and API access.9.3
- MoisesA broad stem-separation toolkit for musicians, with bulk processing and apps across platforms.9.2
Pymss vs the competition
- Pymss vs Fadr
- Pymss vs LALAL.AI
- Pymss vs AudioShake
- Pymss vs Audiola
- Pymss vs Ultimate Vocal Remover
- Pymss vs MVSEP
Compare Pymss with any tool side by side →
Also Ranked In
Pymss is ranked in 2 of our directories.
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Featured on iTechGuides
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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