Best Apps for Tracking GLP-1 Doses and Side Effects, and Which One Fits You

All four apps record what happens, and your doctor still makes the dose decisions.

Which GLP-1 app fits what you need to track?

You want something to hand your doctor. Shotsy logs shots or pills, dose changes, injection sites, side effects, weight and nutrition, then exports it all as a PDF report for your prescriber (Shotsy's tracker page). It also lets you log compounded semaglutide and tirzepatide with custom doses, which helps if your prescription doesn't match a branded pen strength. That option describes what the app can record. It does not mean Shotsy has reviewed or endorsed compounded medications. Shotsy says it was built by GLP-1 patients, and it shows an estimate of how much medication is in your system between doses. That figure is a calculation, not a blood test.

You want to know which shot set off the nausea. MeAgain's after-shot symptom log records nausea, fatigue and food tolerance next to the shot they followed, so you can see whether rough days line up with a particular dose (MeAgain's shot tracker page). It also tracks injection sites, food noise (the constant background thoughts about eating), protein and water goals, and progress photos (MeAgain on the App Store).

You want to rate how bad it feels. Glapp logs nausea, fatigue, bloating and constipation with an intensity rating. It scores appetite and food noise on a five-point scale from absent to intense, and it also tracks mood and energy (Glapp). On the dose side, Glapp keeps your titration history (the step-by-step dose increases) and rotates injection sites for you. It also compares your weight change with other users and with clinical trial results such as SURMOUNT-1, a tirzepatide trial.

You want food and habits in the same app. Pep logs shots, pills, weight, meals and body measurements, with a calendar view so you can see patterns over the week (Pep). Its Google Play listing adds site rotation prompts, hydration and meal reminders, progress photos and side-effect monitoring (Pep on Google Play). That listing also names compounded medications and retatrutide among the medications the app supports. The list shows what Pep lets you log. It does not show that a medication is approved or right for you. Pep says your health data is never sold.

You take a pill. MeAgain names the Wegovy pill and Foundayo. Pep logs pills on its main page. Shotsy tracks pills on iPhone only.

The ratings look similar, and each comes from a different place. On the pages checked in October 2026, Shotsy's own site reported 4.8 stars from more than 31,000 App Store ratings. MeAgain's App Store listing showed 4.8 from 30,000 ratings. Pep's own site reported 4.7 across more than 3,000 App Store and Google Play ratings. Glapp's own site cited 4.9 on Trustpilot, a review site rather than an app store. Ratings and counts change over time. Every feature above also comes from the developers' pages or the app store listings, and none of these sources is an independent test of the apps.

What do these apps cost, and will they work on your phone?

These details come from the developer and store pages.

MeAgain's App Store listing says "Only for iPhone," but its own website says it runs on iPhone and Android. If you use Android, search Google Play before you plan around it. None of the four pages listed a price for premium features, so check the in-app price before you subscribe to anything.

What should you do with your side-effect log?

Bring it to your prescriber. A tracker can't tell you when to raise, hold or skip a dose. MeAgain says outright that it "does not provide dosing advice, dose-change recommendations, missed-dose medical instructions, or injection technique guidance." Those decisions belong to the doctor who knows your history.

Some symptoms need a call instead of a log entry. The FDA's Wegovy label lists severe gastrointestinal side effects as a warning. It also warns about acute kidney injury caused by losing too much fluid (2025 Wegovy prescribing information). If you take Zepbound, its Medication Guide lists the serious side effects to watch for with that medication (Zepbound Medication Guide). If vomiting or diarrhea won't stop, or you can't keep fluids down, contact your prescriber promptly.

The research we reviewed does not test any of these trackers on their own. The closest study looked at a clinician-led online weight program for Danish adults with overweight or obesity, run through the Embla app. In that program, doctors prescribed semaglutide and adjusted each person's dose, and participants also got coaching on food, exercise and habits (Embla study). This was a real-world, observational study that looked back at program records. Participants who stayed in the program lost weight, and the researchers said the results were comparable to the large drug trials, on lower average doses. Many people left before the study ended, so those results describe the people who stayed. The program combined medication, dose adjustments and coaching, so comparing it with other studies does not show that an app caused the weight loss.

To turn your log into a plan, take the quiz. It's the starting point for doctor-led GLP-1 care. Export your app's report or take screenshots of your dose and symptom history, so your doctor can see your doses and how you've felt on them.