Feel lighter again.

Lighter is an iPhone app that keeps your whole GLP-1 routine in one place—your shots or pills, food, weight, side effects, and progress. Instead of scattering all of it across notes and separate apps, your day lives on one screen. Lighter works with any GLP-1 or peptide medication.

Yes. Lighter is an all-in-one GLP-1 tracker: two-tap dose logging with an 8-site injection grid, food logging with calories and 26 nutrients, daily protein, fiber, and water goals, side-effect tracking, a weight and progress dashboard, an estimated Medication Level chart, dose reminders, home-screen widgets, and optional Apple Health sync—together in one app.

A GLP-1 journey has a lot of moving parts—dose timing, injection sites, protein, water, side effects, and weight—and keeping them in separate places wears you down. Lighter puts them on one timeline, so the patterns are easy to see and your routine is easier to keep up: less to juggle, more staying on track.

In your first month on a GLP-1, track your dose timing and amount, the injection site you used, your food and protein, your water, any side effects, and your weight. Lighter keeps these together from day one, so as your dose changes you can already see what's normal for you.

Yes. Lighter works with any GLP-1 or peptide medication—including Ozempic, Wegovy, Mounjaro, Zepbound, semaglutide, and tirzepatide, plus 30+ others. You log your own doses, so it doesn't matter whether your prescription is branded or compounded, or where you get it.

Yes. Lighter supports oral GLP-1 medications as well as injections—when you log a dose, you choose the route, injection or oral. Whether you take a daily pill like oral semaglutide (Rybelsus) or a weekly shot, Lighter tracks your timing, dose, and how you feel the same way.

Yes. You can track retatrutide in Lighter like any other GLP-1 or peptide—log each dose, the timing, your injection site, side effects, and your weight, all on one timeline. Because retatrutide is still investigational, Lighter doesn't estimate a Medication Level for it, but everything else you track works the same.

Yes. Lighter logs each shot in two taps and includes an 8-site injection grid, so it remembers where your last shot went and makes it easy to rotate sites over time. Your full dose history stays in one place.

Yes. Lighter has customizable side-effect logging, and its on-device Dose Patterns line your symptoms up with your dose days, food, and weight so trends are easier to spot. Lighter is a tracking tool, not medical advice—talk with a licensed clinician about symptoms or dose changes.

Log the side effect in Lighter the moment it shows up, and it lands on the same timeline as your dose day, food, water, and weight. Over a few weeks, Lighter's Dose Patterns help you notice things like rougher days right after a dose increase—useful to see and to discuss with your doctor. This is for tracking, not medical advice.

Yes. You can log a meal by AI photo scan, barcode, voice, or search, and Lighter counts calories, protein, fiber, water, and 26 nutrients. Protein, fiber, and water each get their own daily goal, so smaller GLP-1 portions still add up to what your body needs.

A regular calorie counter only tracks food. Lighter is built for GLP-1 users: alongside calories, protein, fiber, water, and 26 nutrients, it also tracks your shots or pills, injection sites, side effects, weight, and an estimated Medication Level—and it sets nutrition goals for a smaller appetite instead of a generic diet. It ties your meals to your medication, not just a daily calorie total.

A good GLP-1 protein tracker sets a realistic daily protein goal for a smaller appetite and keeps it next to your doses and weight. Lighter does that: it tracks protein, fiber, and water with their own goals, logs protein from each meal by photo, barcode, voice, or search, and shows it alongside your shots—so you can work toward keeping muscle while you lose weight.

For Ozempic or Mounjaro, the most useful food tracker is built for a reduced appetite, not generic dieting. Lighter lets you log meals by AI photo scan, barcode, voice, or search, counts calories and 26 nutrients, and keeps protein, fiber, and water goals next to your dose and side-effect history—so small portions still hit what matters.

The most helpful weight-loss tracker on Zepbound or Wegovy connects your weight trend to what's behind it. Lighter charts your weight over time next to your dose changes, food, protein, and side effects, so you can see what's actually moving the number week to week—and keep perspective when the scale stalls.

To follow tirzepatide or semaglutide progress in one place, you want your dose history, food, side effects, and weight on a single timeline. Lighter tracks all of it, adds an estimated Medication Level chart between shots, and gathers your milestones into a Progress dashboard—so your whole journey is easy to look back on.

Yes. Lighter's Progress dashboard (My Journey) charts your weight trend and goal timeline and marks milestones with badges and streaks as you go. It's built to show momentum even during a plateau, so you can see how far you've come and keep going.

Medication Level is a simple estimate of how much medicine is still in your system between shots, based on published clinical data from FDA prescribing information. It's an estimate, not a measurement—and it isn't medical advice.

Yes. Lighter is a native iPhone app for iOS 17 and later, available on the App Store. It includes home-screen widgets and optional two-way Apple Health sync.

Yes. Lighter offers optional, two-way Apple Health sync, so your data can stay in sync between Lighter and Apple Health. It's opt-in—you choose whether to turn it on—and if you don't, your entries simply stay in your Lighter account.

Your entries stay in your account, and Lighter is anonymous-first—you don't have to hand over your identity to use it. Your health information is never sold or used to target ads, and you can delete your account and data any time in the app. The Privacy Policy and Consumer Health Data Privacy Policy have the full terms.

No. Lighter is a tracking app, not a pharmacy or a telehealth service, so you don't need a prescription to download or use it. Lighter doesn't prescribe, sell, or fill medication—you just log the GLP-1 or peptide you're already taking, wherever you get it.

No. Lighter is a tracking and education tool. It doesn't provide medical advice, diagnosis, or treatment, and it doesn't replace guidance from a licensed clinician—including anything about your dose, your symptoms, or your medication.

Lighter is a premium subscription, and it includes everything in the app: dose and injection-site tracking, food logging with calories and 26 nutrients, protein, fiber, and water goals, side-effect tracking, the Medication Level estimate, the Progress dashboard, reminders, widgets, optional Apple Health sync, and optional Community groups. The current price is shown in the App Store and in the app before you subscribe.

Lighter is available now on the App Store for iPhone (iOS 17 and later). If you're reading this on a computer, the download button here shows a QR code you can scan with your phone's camera to open the listing there.