Penly

Your GLP-1 journey in one calm place. Penly reminds you of your next dose, suggests a fresh injection site every time and turns your weigh-ins into a trend you can trust.

Weekly shots are easy to lose track of. Which day was it? Left or right side? Was that nausea the day after the dose or two days later? Penly answers those questions in seconds, so your appointments are about decisions, not guesswork.

Doses and injection sites

• Log a shot or a pill in two taps: medication, dose, time and injection site
• A body map shows where you injected recently and suggests the next site
• A countdown to your next dose, a reminder on the day and a check-in if you forget to log
• Works with semaglutide, tirzepatide, liraglutide and dulaglutide pens, oral semaglutide and compounded medications

Weight and progress

• Weigh-ins in kg or lb with an easy ruler, plus waist and other measurements
• A smoothed trend line with your goal and every dose step on the chart
• Milestones at 5, 10 and 15 percent of your starting weight, never rewards for losing faster
• Progress photos with side-by-side compare (Pro)

How you feel

• Log nausea, constipation, fatigue, heartburn and more, with intensity and notes
• See which days after your dose side effects tend to show up (Pro)
• Water and protein in one tap, because both matter when appetite is low

Estimated medication level (Pro)

• A day-by-day curve built from your logged doses and published half-life data
• See where you are in your weekly cycle at a glance
• Always labeled as an estimate, never a lab result

Ready for your doctor

• A one-page PDF with your plan, doses, weight chart and side effects (Pro)
• CSV export of everything you logged (Pro)

On your wrist and Home Screen

• Apple Watch app: days until your dose, log a shot, add a glass of water
• Widgets for your next dose and a daily overview
• Siri: "Log my shot in Penly"

Private by design

Your journal lives on your iPhone and in your private iCloud. Doses, weight and side effects never go to analytics or advertisers. Weight sync with Apple Health and smart scales is optional (Pro).

Free and Pro

Free: dose logging, site rotation, reminders, the weight chart, side effects, water and protein, Apple Watch and the Next Dose widget. Logging your own data is never locked.
Pro: estimated medication level, weekly pace and goal date, side effect patterns, progress photos, the doctor PDF, Apple Health sync, supply and refill alerts, all widgets, CSV export and Face ID lock.

A journal, not medical advice

Penly is a personal journal, not a medical device. It never recommends or changes doses and does not interpret symptoms. Always follow your prescriber. Ozempic®, Wegovy®, Mounjaro®, Zepbound®, Rybelsus®, Saxenda® and Trulicity® are trademarks of their owners; Penly is not affiliated with or endorsed by them.