Add it to your home screen
iPhone and iPad, SafariTap the Share button at the bottom of the screen, then "Add to Home Screen", then "Add". Open it from the new icon from then on.
Android, ChromeTap the three-dot menu, then "Add to Home screen" or "Install app", then confirm.
Desktop, Chrome or EdgeClick the install icon at the right end of the address bar, or the browser menu, then "Install Read the Mark".
Why it matters on iPhoneSafari can delete a website's stored data after seven days without a visit. The installed version is exempt, so a weekly medication and a Vial Log belong on the home screen.
What works offline
Any page you have opened once, the calculator itself, and your Vial Log. Pages you have never opened need a connection the first time. The report form and the label links need one every time.
What it does not do
It sends no notifications and has no account. Reminders that arrive while the app is closed would need a server that knows your schedule, and this site keeps no such thing. The Vial Log offers a calendar file for the earliest date instead, which your own calendar app can remind you about.
The installed app carries the site's name, Read the Mark. It is the same site, not a separate program, so it updates itself when you have a connection.