GRIPCALC Open calculator
INSTALL · TWENTY SECONDS, ONCE

Put GripCalc on your home screen

GripCalc is a web app: no app store, no account, about one megabyte. Added to your home screen it opens full-screen with its own icon and — the part that matters — works with no signal in the paddock: the engine, the fonts and the whole database live on your phone. Install it at home on the Wi-Fi, and the circuit with no reception can't take it off you.

1 · PICK YOUR DEVICE

The steps, per platform

iPhone and iPad

Apple only allows this from Safari's share sheet, so start there.

  1. Open gripcalc.com in Safari (not Chrome — on iOS it usually can't do this).
  2. Tap the Share button — the square with the arrow pointing up, middle of the bar at the bottom.
  3. Scroll the list and tap Add to Home Screen.
  4. Tap Add. The icon lands on your home screen; open it once while online and it's yours offline.

Android

Chrome may simply offer you an Install card when you visit — that's this, in one tap.

  1. Open gripcalc.com in Chrome (or Samsung Internet).
  2. Tap the ⋮ menu, top right.
  3. Tap Add to Home screen (some versions say Install app).
  4. Confirm. Done — icon on the home screen, works offline after the first online open.

Desktop — Chrome or Edge

Useful on the pit-wall laptop; the same offline promise applies.

  1. Open gripcalc.com.
  2. Click the install icon in the right end of the address bar (a screen with a down arrow), or the browser menu's Install GripCalc… entry.
  3. Click Install. It opens in its own window from then on.
Open the calculator now
2 · ASKED BEFORE INSTALLING

The questions that come up

Is this a download? Is it safe?

It's the same website, granted an icon and offline storage by your browser — nothing is sideloaded and no permissions are asked beyond what any website gets. Remove it any time by deleting the icon like any app.

Does it really work with no signal?

Yes — that's the point of it. Calculator, database, pyrometer analysis and your saved sessions all work in airplane mode. The one thing that needs a network is the optional weather pre-fill for air temperature; offline, you type the number off your own thermometer instead.

Updates?

Automatic and quiet: next time you open it with a connection, it fetches the latest build in the background. Your sessions and settings stay put through updates.

And my saved sessions if I remove it?

Sessions live only on your device — nothing is on our servers to restore from. Removing the installed app or clearing site data can take them with it, so if the history matters, use the app's history export in settings first.