Revocalize AI vs SoulX-Singer

Revocalize AI creates AI voices and trains custom voice models using voice-synthesizing technology. Its voice-conversion service captures a voice's harmonics and transforms an input voice into another. Listed tools include voice beautification and transformation, emotion, language versatility, real-time auto-pitch, vocal variations, and pitch, volume, and speed controls. Music creators can use the VST plugin for voice transformation, beautification, and harmonizing; compatible hosts named on the site include Logic Pro, Ableton, and FL Studio. Beta API documentation describes voice-to-voice conversion, text-to-singing, and speech, with access beginning by creating an account and API key. The site names sound engineers and producers, labels and publishers, artists and creators, and music enthusiasts and fans as use cases. Its Free plan includes 5 conversion minutes per month and one Starter AI voice. Starter costs $9 a month for 120 minutes and two Ultimate AI voices; Creator costs $39 a month for 300 minutes and five Ultimate AI voices. The VST plugin is listed for a 49.00 USD one-time payment. Exports include MP3 and WAV. Users are responsible for their uploaded or created content and may not create content that infringes others' rights.

SoulX-Singer is a singing voice synthesis model that generates voices for singers it has not been tuned on. Pitch, rhythm, and expression can be guided by melody-conditioned F0 contours or score-conditioned MIDI notes. Its voice-conversion system changes raw singing audio to a target singer’s voice while retaining melody, rhythm, and lyrics, without requiring lyric or MIDI transcriptions. It supports Mandarin Chinese, English, and Cantonese, plus singer-timbre cloning, cross-lingual synthesis, and lyric editing while retaining natural prosody. Preprocessing tools handle vocal separation, dereverberation, F0 extraction, voice activity detection, and lyric and note transcription. Users can edit MIDI metadata, including lyrics, phoneme alignment, pitches, and durations, before synthesis. Soul-AILab provides generation and conversion demos and a separate MIDI editor through Hugging Face Spaces; the repository also supports local inference. Code and model weights use the Apache 2.0 license. Maintainers caution that automatic preprocessing may misalign singing with lyrics and notes, so manual correction may be needed.