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Head-to-head · Stem Separation Software

Fadr vs Pymss

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Fadr #1 in Stem Separation Software 9.4/10 Free plan Free plan✓ 2 of 3 features Visit Fadr
Pymss #6 in Stem Separation Software 8.9/10 Free plan Free plan✓ 3 of 3 features Visit Pymss

Fadr leads on 0 checks, Pymss on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreFadr · 9.4/10
  • Free planboth
  • Most featuresPymss · 3 of 3

Fadr scores higher on our rubric for stem separation software: 9.4 against 8.9 out of 10; our editors rank them #1 and #6.

Fadr is the better fit for creators needing broad separation and remix tools. Pymss is the better fit for open-source users wanting a full separation workspace.

  • Fadr fits best

    Creators needing broad separation and remix tools

  • Pymss fits best

    Open-source users wanting a full separation workspace

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Fadr 9.4/10 Visit ↗ Pymss 8.9/10 Visit ↗
At a glance
Editor score 9.4 8.9
Ranking #1 in Stem Separation Software #6 in Stem Separation Software
Best for Creators needing broad separation and remix tools Open-source users wanting a full separation workspace
Pricing model Free plan + paid Free
Starting price — Free plan
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Desktop Cloud, Desktop, Mobile
Platforms Web, Windows, macOS Web, Windows, macOS, Linux, iOS, Android
Integrations 2 integrations 2 integrations
Features Fadr 2/3 · Pymss 3/3
Batch processing ✓ ✓
Desktop app Not checked yet ✓ (best)
API access ✓ ✓
Specs
Stem types Vocals, lead vocals, background vocals, bass, instrumental, drums, kick, snare, other drums, melodies, piano, guitar, acoustic guitar, electric guitar, strings, wind, other melodies vocals, drums, bass, other
Max upload size 200 MB Not checked yet
Max track length 60 min Not checked yet
Export formats MP3, WAV WAV, FLAC, MP3, M4A, AAC, Opus, Vorbis, OGG
Our review
Pros
  • Separates vocals, bass, drums, melodies and instrumental stems
  • Adds MIDI, chord, key and tempo detection plus remix tools
  • Plus includes WAV downloads, a DAW plugin and API access
  • 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.
Cons
  • Basic plan does not include the 18 stem types listed for Plus
  • WAV downloads, DAW plugin and API access require Plus
  • Plus costs $10 USD per month
  • 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

Fadr is a web-based music technology service for musicians, producers, DJs and other creators who need to separate songs and work with the resulting audio. Its tools cover vocals, bass, drums, melodies and instrumental stems, alongside…

Read the review →

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…

Read the review →
  1. FadrStem Separation Software 9.4Free plan
  2. PymssStem Separation Software 8.9Free plan

Strengths and trade-offs

  • Fadr — where it wins

    • Separates vocals, bass, drums, melodies and instrumental stems
    • Adds MIDI, chord, key and tempo detection plus remix tools
    • Plus includes WAV downloads, a DAW plugin and API access

    Where it doesn't

    • Basic plan does not include the 18 stem types listed for Plus
    • WAV downloads, DAW plugin and API access require Plus
    • Plus costs $10 USD per month

  • Pymss — 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.
  • Fadr9.4/10 · Free plan

    A free starting point for stem separation, remix tools, MIDI detection and API workflows.

    Visit FadrFull verdict →
  • Pymss8.9/10 · Free plan

    A local separation workspace with batch tools, model management, and four core stems.

    Visit PymssFull verdict →

More comparisons

All stem separation software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update