32bard vs StemForge

32bard is a web-based AI mashup maker for combining songs and arranging their parts. Its generation process handles stem separation, BPM matching, and key alignment, with the maker describing a result in about 30 seconds. A visual editor places vocals, instruments, bass, and drums on four lanes across a 32-bar grid. Users can search Spotify for songs and import track metadata. A free compatibility checker scores song pairs using BPM distance and harmonic key match without requiring signup. The service supports waveform playback and exports in AAC, MP3, or WAV; MP3 and WAV export require Pro. The maker says its AI detects BPM, key, and stems, so music theory or DJ skills are not required. Users can begin without signing up or adding a credit card. The Free plan is free and includes three full-quality mashup generations per month with AAC playback. Pro costs $9.99 a month and includes unlimited mashups plus MP3, WAV, and AAC export.

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.