Fadr vs StemForge

Fadr is a music tool for separating vocals and 15 other instruments from songs, making remixes and DJ sets, and creating instruments and drum kits with AI. Fadr Basic offers unlimited stems, remixes, and DJ sets, with high-quality MP3 downloads; song uploads on Basic are limited to 10 minutes. Fadr Plus provides 18 stem types, uploads up to one hour, WAV downloads, plugins, API access, and unlimited storage for $10/mo.

Siren makes playable instruments from words and provides ADSR controls and low-pass, high-pass, band-pass, and notch filters. DrumGPT creates 16-element drum kits from text prompts, with pitch, volume, and amplitude-envelope controls. The Stems Plugin works with major DAWs and other software that supports VST3, with Windows VST3 and Mac VST3/AU support. Siren is available online, as an iPhone and iPad app, and as an audio plugin. The API separates songs into vocals, drums, bass, melodies, and instrumental, and detects MIDI, chords, key, and tempo. API use requires Fadr Plus; its Create Stem Task endpoint costs US$0.05 per minute of audio.

StemForge is a locally run, browser-based audio workstation for separating stems, extracting MIDI, generating audio, composing songs, mixing, and exporting. Demucs and BS-Roformer can separate audio into vocal, drum, bass, other, guitar, and piano stems; spectral analysis informs engine and model recommendations. For MIDI extraction, StemForge uses BasicPitch on instrument stems and faster-whisper with pitch tracking on vocal melodies. Its Synth tab generates text-conditioned audio with Stable Audio Open for up to 600 seconds, with optional audio or MIDI conditioning. Compose uses AceStep for song generation and RVC for voice conversion, with 14 built-in voices and a HuggingFace model browser. Mix combines stems, MIDI-rendered tracks, synth outputs, and composed songs; exports include WAV, FLAC, MP3, and OGG, individually or in a ZIP. The project says audio remains on the user's computer and no internet is needed after initial model downloads. Setup requires Python 3.12, FFmpeg, and FluidSynth with a GM soundfont. The software is free and open source.