Your band's private cloud and pocket rehearsal studio. Rehearsals and Cubase / Studio One projects shared across every PC and phone, and for every song: separated instruments, chords, color-coded structure, adjustable tempo. On your own PC, no subscription.
The rehearsal WAV is on WhatsApp, compressed. The Cubase project got overwritten. The guitarist forgot the bridge chord. And everyone pays their own subscription.
No sound engineer, no cables, no computer in the rehearsal room: one phone is enough to make quick demos. Then everyone, at home, can suggest a structure and make their own version of the song, which the others can hear.
+ › Record audio, then the big red button, on a real drum groove (100 reference grooves in 10 styles, recorded in a studio) or a simple click. When you stop, the played part is pre-selected, the level is set, and the take is already cut into patterns: tap one to loop it. Trim and fade with a finger.
Rehearsal rooms rarely have Wi-Fi: choose Keep on the phone, then Send all once you're back on the network. The take travels lossless (FLAC, about twice as light as WAV), resumes by itself after a cut without losing anything, and lands as an m4a in the folder you chose.
As soon as it arrives, your band's server analyzes it by itself: tempo, bars, sections, A/B/C patterns, chords. At night it also separates the vocals, guitars, bass and drums. On your PC, not in a data center.
In the advanced player, the song arrives already cut into colored sections. Then it's up to you:
Everything can be undone. Corrections to the sections are shared with the whole band.
Still in the advanced player, the red button records a take over the song, aligned to the music. It becomes a mixer track and a file shared with the band, ready for Studio One or Cubase.
Save your arrangement: it becomes a new file in the band folder, which the others can listen to and comment on. When the structure is settled, To Studio One or Cubase creates a ready-to-open project with separated tracks, or you take the WAV into any DAW.
Real screenshots, in the order you'll use them, with one of our own songs, "Born to lose". The app is available in French and English (the advanced player and the recorder are still in French for now).
Each short video shows one feature, filmed in the app (in French).
Online storage services keep your rehearsals and unreleased demos in distant buildings owned by large companies, and charge you every month for the space. 28JoursBox does the opposite: everything stays on a PC in your band.
Files, versions, takes, analyses, separated tracks: everything is on the disk of your server PC. No third-party service stores your songs.
No price per member or per gigabyte. You buy a disk once and pay the electricity of a PC. Our band: about 720 GB on a 4 TB disk.
Instrument separation, chords, song structure and even speech-to-text transcription are computed on your PC, not by an online AI provider. Your demos and meetings never leave.
No company account, no terms that change overnight, no price increase. Your files are ordinary files on each PC, readable without 28JoursBox.
What musicians pay for separately today, brought together and installed at home.
A folder on every PC's desktop that syncs by itself. Like a cloud drive, but at home and built for music.
In your phone's browser, nothing to install: every song split, analyzed and ready to practice.
One tap, and the song becomes a ready-to-open Studio One or Cubase project: separated, colored tracks locked to the grid.
Gig photos, rehearsal videos, posters, setlists: send them straight from your phone and the whole band can see them right away, on every phone and every PC. Stored at home with everything else, not in a data center.
Take a photo or a video from the app, or pick several from your gallery: the app reminds you when you last sent some.
Thumbnails in the list, photos and videos full screen, in landscape too. Swipe to the next one.
They land in the 28JoursBox folder of every member's PC, ready for a poster, a video edit or social media.
A whole gig folder for the venue or your fans: a public read-only link, with a password and an end date if you like.
Drop in a recording, a demo or a YouTube link: a few seconds later the song is split and analyzed, on your server.
Every song is split into four tracks by a state-of-the-art AI: vocals, guitars, bass, drums. A real mixer, set and remembered for each song.
Press ⏺: count-in, playback of whatever you want to hear, and the mic records. The take is aligned precisely thanks to a measurement of the phone's latency, and becomes a mixer track shared with the whole band.
No file goes to a hosting company. Even the AI runs on your machine: nothing is sent to an online service. The only storage limit is your hard drive.
| Cloud storage | AI practice app | 28JoursBox | |
|---|---|---|---|
| Where your files are stored | A company's data center | A company's data center | At home |
| Where the AI runs | — | A company's data center | Your PC |
| Folder synced across every PC | ✔ | — | ✔ |
| Files on your own machine | — | — | ✔ |
| Built for Cubase / Studio One | — | — | ✔ |
| Separated instruments | — | ✔ | ✔ |
| Adjustable tempo and loops | — | ✔ | ✔ |
| Chords and key | — | ✔ | ✔ |
| Structure shared with the band | — | — | ✔ |
| Aligned, shared takes | — | — | ✔ |
| Ready-to-open Studio One / Cubase export | — | — | ✔ |
| Monthly subscription | often | often | none |
| Price grows with | GB and members | members | nothing |
Everyone shows up to rehearsal knowing their part, at the right tempo.
From rehearsal to studio without manual realigning or overwritten sessions.
One song, every track, at each student's tempo.
Your unreleased demos never leave your home.
One person takes care of the server. Everyone else just clicks a link.
On a Windows PC in your band (even an old PC sitting in a closet). Band name, your nickname, and you're set.
By WhatsApp, email or QR code. Each member just picks a nickname.
The folder appears on every PC's desktop, and the app on everyone's phone home screen.
Yes. No subscription, no paid version, no ads. If the project helps you, you can support its development with a donation, no obligation.
Because your songs would then live in a company's data center, under its terms and its prices, which grow with every gigabyte and every member. With 28JoursBox, they stay on your band's PC, the AI runs there too, and there is nothing to pay per month. The full argument.
A Windows 10 or 11 PC (64-bit) that acts as the server and stays on, with disk space for your songs. Other members use their Windows PC and/or their phone (iPhone or Android), with nothing to install on the phone.
Not yet for the server or the synced folder. The web app, however, works in any browser, including on Mac, iPhone and iPad.
Yes. The simplest way: Tailscale (free), built into the server, with nothing to set up on your router or phones. Faster: direct access, set up once by the admin (a free DuckDNS name, a port forwarded on the router, an HTTPS certificate obtained automatically); Tailscale then stays as a backup. At home, PCs keep using the local network, which is faster for big WAV files. Step-by-step guide, router by router.
No. Instrument separation, chord, tempo and structure detection, and speech-to-text transcription all run on your server. Nothing is sent to an online service.
No. Heavy processing (separation, fine analysis) runs overnight at low priority so the server stays responsive. Next day, everything is ready.
Your files and the server data are kept. Reinstalling or updating brings everything back: accounts, history, trash.
Yes, on phones and in the browser, provided LibreOffice (free) is installed on the server PC, in its default folder. The server converts each document to PDF the first time it is opened, then prepares new ones at night. Without LibreOffice, the app shows "Preview unavailable" for these files; everything else works.
Every member's PC keeps a full copy of the folders it syncs, so your files are not lost. But the server's history, trash and analyses are only on its disk: that's the flip side of independence. Make a regular backup to an external disk, ideally kept somewhere else. The user guide explains how.
Install 28JoursBox tonight, send the link to your band, and play.