Penwise tracks every shot, your weight and how your body responds. Everything lives on your phone: no account, no server, nothing to leak.
Free core tracker, forever. 14-day Penwise+ trial, no card needed.
This is not a policy we could quietly change. There is no Penwise server for health data, so there is nothing for us to hand over, sell or lose.
No email, no password, no sign-up. The app works the moment you install it.
Every dose, weight and symptom stays in the app on your device. We never receive it.
No ad networks, no attribution SDKs, no third-party analytics on your health data.
Backups are encrypted on your device with a passphrase only you hold. We hold no keys.
A log tells you when you last injected. Penwise models how much medication is in your system right now, using real absorption and elimination half-lives for semaglutide, tirzepatide, retatrutide and liraglutide. It is the difference between "my last shot was Tuesday" and "I am on the downslope, which is why the food noise is back".
Which injection site actually hurts less for you. Which day after a shot the nausea tends to land. Whether you are drifting late on your doses. Penwise only says something when it has enough of your own history to be right, so it stays quiet rather than inventing a pattern from three data points.
A built-in studio turns your milestones into something that looks designed rather than screenshotted. Pick a subject, a layout and a palette, add your own photo and headline, and hand it straight to Instagram, WhatsApp or your camera roll.
The core tracker is meant to stay genuinely useful without ever paying, including getting your own data back out.
Everything above, plus the parts that turn a log into an understanding of your treatment.
Apple Watch and Wear OS apps are included at no extra cost. Most trackers in this category have neither.
Import your export, CSV or backup, in a couple of taps. Shots, weights, sites and side effects all come across, importing the same file twice never duplicates anything, and the whole import can be rolled back if you change your mind.
New features, what we are working on, and the odd thing we learn about GLP-1 tracking. A few times a year at most.
We only use your address for this newsletter. Unsubscribe from any email. Your health data is never involved: it stays on your phone.
