Portability
Interest & Loan — one file, anywhere, forever
On Interest & Loan —
The Interest & Loan is one HTML file. Not one file plus a database. Not one file plus a config folder. One file, self-contained, running the whole reckoner end-to-end. You can email it to yourself and it works.
The file on a drive
USB stick, Dropbox folder, network share, encrypted container, phone. Anywhere a file can live, the Interest & Loan can live. Double-click; it opens. No installer, no dependencies, no runtime to keep patched.
This is what "runs anywhere" used to mean before it started meaning "runs in our cloud, from any device".
Browsers, operating systems, and time
The Interest & Loan runs in Chrome, Edge, Firefox, and Safari; on Windows, macOS, Linux, and ChromeOS; on a work laptop, a personal one, or a friend's. Offline in a cabin, offline on a plane, offline on the second morning of a data-centre outage you did not cause.
The portability isn't a feature we bolted on. It's what happens when you refuse to build a back end.
Backup discipline
Because the Interest & Loan is a file, you back it up the way you back up anything that matters: a copy on your machine, one on a drive, one somewhere safe. Export the data as JSON alongside the file for good measure.
You are not delegating your backup to a vendor's status page. You are keeping copies, like a grown-up.
Where the Interest & Loan runs
- Any browser after ~2018Chromium, Firefox, Safari — recent versions of each.
- Any OSWindows, macOS, Linux, ChromeOS.
- Fully offline once cachedFirst open populates the browser cache; then, forever, offline.
- Any storage mediumSSD, HDD, USB, encrypted volume, network drive, sync folder.
Questions people ask
Can I use the Interest & Loan on my phone?
It opens on mobile. Whether it is comfortable there depends on the shape of the tool — read on the phone, edit on a laptop for the fiddly bits.
Two devices at once?
Sequential, not simultaneous. It is a file, not a service. Sync via any file-sync tool you already trust (Dropbox, iCloud Drive, Syncthing) or pass a USB.
How big is the file?
Small. The bulk is JSON of your own data, which for most people is a few hundred KB at most.
One file. Your work. Your machine. Anywhere you plug in.