If you strictly take brand-name auto-injector pens (Ozempic, Wegovy, Zepbound) and only want a clean shot calendar, Shotsy has the cleaner, less cluttered interface. If you care about body scan photos and measurements alongside your weight, MeAgain offers deeper visual journaling. But if you take compounded semaglutide or tirzepatide (requiring U-100 syringe unit calculations), want 5-day half-life decay modeling, track daily protein targets, and refuse to pay an annual subscription, GLPme wins outright on clinical utility, privacy, and cost ($0 free forever).
Feature Comparison Matrix: Shotsy vs MeAgain vs GLPme
Direct side-by-side comparison across features that actually matter to patients managing GLP-1 and dual GIP/GLP-1 therapy:
| Feature / Capability | Shotsy | MeAgain | GLPme (Alternative) |
|---|---|---|---|
| Primary Focus | Dose logging & Apple Health | Body photos & habits | Compounded math & clinical timeline |
| Pricing Model | Freemium ($19.99/year) | Freemium ($39.99–$59.99/year) | 100% Free Core ($0) |
| Compounded Syringe Units (U-100) | ✗ None (Fixed mg only) | ✗ None (Fixed mg only) | ✓ Native automatic unit conversion |
| Pharmacokinetic Half-Life Decay | ✓ Yes (Pro paywall) | ✗ No pharmacokinetic modeling | ✓ Yes (Free 5-day curve) |
| Apple Health Bidirectional Sync | ✓ Yes (Requires Pro) | ✓ Basic sync | ✓ Yes (Free Apple Health) |
| Daily Protein Target Math | ✗ No (Requires MyFitnessPal) | ✓ Basic calorie tracking | ✓ Dedicated lean-mass protein targets |
| Food Noise & Appetite Journal | ✗ Generic notes field only | ✓ Daily mood check-in | ✓ Dedicated 1–10 food noise tracking |
| Data Privacy & Offline Storage | Cloud Synced / Analytics SDKs | Cloud Synced / Analytics SDKs | 100% On-Device (Zero cloud trackers) |
1. Deep Dive: Shotsy Teardown
Shotsy: The Pen-First Legacy Tracker
Shotsy is the most established dedicated GLP-1 dose tracking app on the App Store. Created by an independent developer, it earned massive popularity during the 2023–2024 Ozempic surge due to its slick widget support and clean visual calendar.
- Polished native iOS interface with home and lock screen widgets.
- Seamless injection site rotation tracking (abdomen, thigh, arm).
- Bidirectional Apple Health weight and dose synchronization.
- Visual estimated medication level curve.
- The $19.99/yr Paywall: History view and Apple Health sync are locked behind Shotsy Pro.
- Zero Compounded Support: Only supports fixed mg doses; patients on 503A/503B compounded vials cannot convert units to mg.
- No Protein Tracking: Ignores muscle wasting risks, forcing users to maintain a second nutrition app.
Read our full laboratory review: Shotsy App Review & Cost Teardown (2026).
2. Deep Dive: MeAgain Teardown
MeAgain: The Visual Habit & Body Scan Journal
MeAgain approaches GLP-1 tracking from a holistic lifestyle and body recomposition angle. Rather than just logging syringe dates, MeAgain emphasizes body measurement logs (waist, hip, chest circumference), side-by-side progress photos, and habit streaks.
- Comprehensive body measurement logs and progress photo overlays.
- Daily wellness habit check-ins (water intake, steps, mood).
- Active community and gamified milestone badges.
- Expensive Subscription: Charges between $39.99 and $59.99 per year, significantly more expensive than Shotsy.
- No Pharmacokinetic Decay Curve: Does not plot the 5-day half-life elimination timeline to predict hunger rebound.
- No Compounded Vial Calculations: Completely assumes brand-name pen dispensers.
- Cloud Account Mandate: Stores sensitive body photos and medical logs on remote commercial cloud servers.
3. The Elephant in the Room: The Compounded Syringe Math Gap
Over 2 million Americans currently take compounded semaglutide or tirzepatide due to ongoing FDA brand pen shortages and lack of insurance coverage. Compounded medication is dispensed in multi-dose liquid vials and drawn using U-100 insulin syringes marked in units.
Neither Shotsy nor MeAgain can calculate syringe units from milligrams.
If your doctor prescribes 0.5 mg from a 5 mg/mL vial, both apps expect you to enter "0.5 mg". But your physical syringe is marked in units (10, 20, 30... up to 100). Patients are forced to calculate Units = (0.5 ÷ 5) × 100 = 10 units by hand, leading to documented 10x overdosing errors when people accidentally draw 50 units instead of 10.
GLPme was built specifically to solve this flaw: choose your vial concentration once, and GLPme automatically maps every dose into exact syringe units with visual barrel diagrams.
4. The Independent Choice: Why Users Switch to GLPme
GLPme: Free, Private, Compounded-Ready
GLPme was built as the antidote to "app stack fatigue." Instead of paying $20/year for Shotsy, $80/year for MyFitnessPal to track protein, and using Notes for food noise, GLPme unifies the entire clinical journey into one private timeline.
- Zero Mandatory Paywalls: Core dose logging, Apple Health sync, and half-life curves are 100% free with no recurring subscriptions.
- Native Compounded Math: Automatic U-100, U-50, and U-30 unit conversions across all vial concentrations.
- Lean Muscle Mass Protection: Calculates your daily protein target (1.2–1.6 g/kg) and tracks daily intake to prevent muscle wasting.
- 100% On-Device Privacy: No remote servers, no advertising SDKs, no email registration. Your medical data never leaves your iPhone.
Frequently Asked Questions
What is the best app for tracking Ozempic or Wegovy?
If you take brand-name pens and only want a calendar with Apple Health sync, Shotsy is the most established paid option ($19.99/yr). If you want an all-in-one companion that includes protein tracking, food noise check-ins, compounded syringe unit calculations, and complete data privacy for free, GLPme is the superior choice.
Is MeAgain better than Shotsy?
MeAgain is better than Shotsy if your priority is taking body progress photos and tracking circumference measurements. However, MeAgain is more expensive ($39.99–$59.99/yr vs Shotsy's $19.99/yr) and lacks pharmacokinetic half-life decay modeling.
Can I switch from Shotsy or MeAgain to GLPme without losing data?
Yes. If you synced your injections and body weight to Apple Health, GLPme automatically reads your historical Apple Health data upon installation. Your entire injection timeline and weight history populate in seconds without manual retyping.
Why is GLPme free while Shotsy and MeAgain charge subscriptions?
GLPme is architected as an offline-first, on-device native iOS application. Because GLPme does not maintain expensive remote cloud servers or sell user telemetry, it can offer its full core clinical tracking suite completely free ($0).
Editorial Disclosure: GLPme Research publishes this comparison. We disclose ownership of GLPme and evaluate competitors based on verified public software capabilities and App Store pricing as of September 2026. GLPme is independent and not affiliated with Shotsy LLC, MeAgain, Novo Nordisk, or Eli Lilly.