Know where you are in your dose cycle, not just when you last injected. Penwise tracks every shot, your weight and how your body responds, and all of it stays on your phone: no account, no server, nothing to leak.
Free core tracker, forever. 14-day Penwise+ trial, no card needed.
Penwise knows the pen, the dose ladder and the way the medication actually behaves between shots. Pick yours to see what that means in practice.
tirzepatide
KwikPen and single-use pen, 2.5 mg to 15 mg, weekly. Sixty clicks to a full dose, thirty days once started.
Read the guidesemaglutide
All four dial pens, 0.25 mg to 2 mg, weekly. Penwise knows why the same 0.25 mg is a different number of clicks on each.
Read the guidesemaglutide
Single-dose pen and the four-dose FlexTouch, 0.25 mg to 2.4 mg, weekly, with the full sixteen-week titration mapped out.
Read the guidetirzepatide
KwikPen and single-use pen, same six strengths as Mounjaro, tracked against a weight-loss goal rather than an HbA1c.
Read the guideliraglutide
Daily rather than weekly, which changes everything about reminders, site rotation and how fast the level moves.
Read the guideoral semaglutide
A tablet, so no site and no pain to record. Penwise hides the fields that do not apply and tracks the fasting window instead.
Read the guideThis 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.
Settings, then Manage My Data, then Export Data. JSON if your version offers it, CSV if it does not.
The in-app walkthrough names the exact path and picks the file up from wherever you saved it.
Penwise previews what it found before writing anything, and the whole import rolls back if you change your mind.
How long the medication actually lasts, why a missed dose matters more on tirzepatide than on semaglutide, what a click on your pen is worth, and how long a pen stays good once you start it. Written plainly, with the numbers shown.
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.
