Fact sheet
| Developer | Sebastian Guerrero, independent developer |
|---|---|
| Platforms | iPhone, iPad, Mac and Apple Watch (native apps) |
| Category | Music, Education |
| Availability | Coming soon to the App Store, worldwide |
| Price | Free download. Metronome and tuner are free forever. Downbeat Studio Pro: £2.99 a month or £19.99 a year (7-day free trial on the yearly plan). One subscription covers every device. |
| Privacy | No account, no ads, no analytics, no tracking. Songs are analysed on the device and never uploaded. |
| Website | sguerrero.dev/downbeat |
| Press contact | seb@sguerrero.dev |
The story
Every musician learns the same way: play along with the record until you can play it without it. The hard part has always been hearing your own part under everyone else's. Tools that split a song into its instruments exist, but most of them upload your music to a server, charge per song, and give you files you then have to load into something else.
Downbeat Studio puts the whole loop in one app. Import a song and it is split into six parts on your iPhone, iPad or Mac, with its chords, key and tempo worked out at the same time. Turn the bass down and play it yourself. Slow a solo to 70% without changing its pitch. Move a song into a key that suits your voice. Nothing leaves the device, and once a song is split it works offline.
Around that sit the everyday tools: a precise metronome and a fast tuner, free for everyone and on Apple Watch with haptic beats, and Jam, which generates band backing tracks in ten styles in any key and tempo.
Key features
- Songs (Pro): split any song into vocals, drums, bass, guitar, piano and other instruments; follow the chords as they play; slow down without changing the pitch, or transpose while the drums keep their sound.
- Jam (Pro): backing tracks in Rock, Pop, Blues, Funk, Jazz, Bossa Nova, Neo-Soul, Ballad, Reggae and Country. Mute any instrument, or describe what you want ("slow blues in A, late-night bar") and Apple Intelligence sets it up.
- Metronome (free): 30–300 BPM, tap tempo, any time signature, subdivisions, five click sounds.
- Tuner (free): guitar, bass, ukulele, violin and chromatic.
- Everywhere: native on iPhone, iPad, Mac and Apple Watch, synced through the user's own iCloud.
- Yours: pick any accent colour and the whole app, icon included, follows it.
How it works
Song splitting runs Meta's open-source HT-Demucs six-stem model, converted to Core ML and quantised to 37 MB. Chords come from a second on-device model (BTC), and tempo, key, beats and bars from Apple's own music analysis. Jam's text prompts use Apple's on-device Foundation Models: the model picks the style, progression and arrangement, and anything the musician states exactly (key, tempo, bar count) is applied as given.
Screenshots
Click any image for full size. All of them are in the ZIP above.
Promo codes and interviews
Happy to give reviewers a year of Pro and to talk about building on-device song separation as a solo developer. Email seb@sguerrero.dev.