Get Glimpse

Glimpse for Android

The app for your tablet or phone: full screen, stays signed in, pop-ups when someone opens your email.

Open the downloaded file (tap the download → Open, or My Files → Downloads → Glimpse.apk).
If Android asks, allow installing from this source (Settings → Allow from this source) → back → Install.
If Play Protect asks: More details → Install anyway (it's your own private app).
Open Glimpse → Add Google account → follow the steps on screen, and allow notifications when asked.

A separate app from Prime Admin — both can be installed side by side.

For your Windows computer. Every Gmail email you send gets tracked automatically.

Open the downloaded file → Extract all → keep the folder (e.g. in Documents).
In Chrome go to chrome://extensions and turn on Developer mode (top right).
Click Load unpacked and pick that folder. (Updating? Remove the old Glimpse first, or click its ↻ reload after replacing the folder.)
Click the puzzle icon → pin Glimpse → open it → paste your account key → Connect.

Chrome may show a "developer mode" note at start-up — that's normal for your own private extension.