WeightSnapThe Best GLP-1 & Peptide Tracker Apps of 2026, Honestly Compared
Last updated: July 2026
Full disclosure before anything else: we make WeightSnap, one of the five apps on this page. So instead of pretending to be neutral, we did the next best thing. Every competitor's strengths are stated plainly, every number comes from public App Store and Google Play listings and the apps' own websites (checked July 2026), and each app wins the category it actually deserves. If we got something wrong, tell us and we will fix it.
WeightSnap is the only one that tells you whether the medication is actually working, and the only one you can run on three taps a day. Shotsy is the most popular, with a free logging tier. Regimen has the deepest compound library and the heaviest logging. Pep AI has the AI companion and meal photo scanning. Glapp is the best free, cross-platform pick (iOS, Android, and web). For tracking peptides you reconstitute yourself, it comes down to WeightSnap or Regimen.
The best GLP-1 and peptide trackers, ranked
Ordered for most people first, with the one category each app genuinely owns. Every app here logs doses and charts weight; what follows is what actually separates them.
WeightSnap
Every tracker on this page charts your weight and logs your doses. WeightSnap is the only one that reads the result back to you: a verdict card (Building, Working, Steady, or Worth watching) backed by your own numbers, Stall Check that shows what changed versus what held when your trend goes flat, Wear-Off Detection for repeating late-cycle fade, and a recap after every dose cycle. It is built for peptides as much as for GLP-1s: a 30+ peptide and blend library, custom compounds, a reconstitution calculator, vial inventory, and per-compound protocols, with a full reconstitution guide behind it. It is also the least demanding to run: by-feel mode is three one-tap questions a day, no food logging, no wearable, and no account, because signing up for yet another service to track your own body is exactly the kind of friction this app exists to remove. Data lives on your device and in your private iCloud. The trade-offs are real: iOS only, no lab bloodwork, and it is a paid app after the one week trial ($4.99/wk, $39.99/yr, or $79.99 lifetime). It holds 5.0 stars on the App Store, though across 70+ ratings rather than Shotsy's thousands.
Shotsy
The biggest community in the category, with about 26,000 App Store ratings at 4.8 stars, polished GLP-1 logging, and built-in food, protein, and water tracking. Core logging is free forever. The catches: it is built around GLP-1s (other medications are bare custom entries, with no reconstitution or vial tooling), and the analytical features (estimated medication-level curves, Apple Health sync) sit behind premium from $9.99/mo. On iOS and Android. Full WeightSnap vs Shotsy comparison.
Regimen
The deepest library: a 200+ compound and brand catalog, pharmacokinetic level curves for 150+ of them with published methodology, 50+ daily check-in markers, and Apple Health and Google Health Connect correlation, on iOS and Android. Free with every feature for your first compound, then $4.99/mo or $39.99/yr. The trade-offs: its depth comes from what you feed it, with no verdict, stall analysis, or wear-off detection, and its health tracking correlates metrics and symptoms rather than integrating direct lab bloodwork. Full WeightSnap vs Regimen comparison.
Pep AI
An AI companion built into a GLP-1 and peptide tracker: snap a photo of your plate for calorie logging, chat with the assistant, track hydration and inventory. On iOS and Android, with about a 3 day trial, then around $3.99/wk, $9.99/mo, or $39.99/yr. The trade-off: its answers come from a model rather than deterministic analysis of your logs, and there is no stall or wear-off detection. Full WeightSnap vs Pep AI comparison.
Glapp
A polished GLP-1 tracker that runs on iOS, Android, and the web with cross-device sync, and is free to start. It logs shots with dose, timing, and site; models semaglutide and tirzepatide levels; runs a shot phase wheel that predicts where you are in the weekly cycle; compares your results against clinical trial data and peer users; and adds an Apple Watch app and a Wisdom AI assistant. About 656 App Store ratings at 4.7 stars. The catches: it is GLP-1 only, with no reconstitution or research-peptide support, and the deeper features sit in a paid Glapp Max tier ($4.99/wk, $9.99/mo, or $39.99/yr). Full WeightSnap vs Glapp comparison.
What about tracking a specific drug?
All five handle the mainstream GLP-1s, so "best semaglutide tracker," "best tirzepatide tracker," and apps for Zepbound, Mounjaro, Ozempic, and Wegovy all point to the same shortlist. The real fork is research peptides you reconstitute yourself, like retatrutide: there, WeightSnap and Regimen pull ahead because they include reconstitution math and vial inventory, and WeightSnap layers a working-or-not verdict on top. If you just want the arithmetic without an app, the reconstitution calculator and the research hub are free on the web.
Feature comparison
| Feature | WeightSnap | Shotsy | Regimen | Pep AI | Glapp |
|---|---|---|---|---|---|
| Answers "is it working?" | Yes (verdict card) | No | No | AI chat | Trend + peer compare |
| Stall analysis | Yes | No | No | No | No |
| Wear-off detection | Yes (Beta) | No | No | No | No |
| Cycle recaps | Yes | No | No | No | Shot phase wheel |
| By-feel mode (three taps a day) | Yes | No | No | No | No |
| Habit layer | Yes (Earn It) | No | No | No | No |
| Medication-level chart | Included | Premium | Free for 1st compound | Varies | Yes |
| Peptides beyond GLP-1 | 30+ plus custom | Custom entries only | 200+ | Yes | GLP-1 only |
| Reconstitution / vial tools | Calculator + inventory | No | Yes | Inventory | Pen supply only |
| Lab bloodwork | No | No | Health-metric correlation | No | No |
| Food logging | Imports from Health | Built in | No | AI meal scanning | Contextual to phases |
| Apple Watch app | No | No | No | No | Yes |
| Accounts | None | None for core use | Yes | Yes | Yes (sync) |
| Platforms | iOS | iOS, Android | iOS, Android | iOS, Android | iOS, Android, Web |
| Free option | 1 week trial | Free logging tier | Free for 1 compound | About 3 day trial | Free tier |
| Price after | $4.99/wk, $39.99/yr, $79.99 lifetime | From $9.99/mo | $4.99/mo, $39.99/yr | $3.99/wk, $9.99/mo, $39.99/yr | Max $4.99/wk, $9.99/mo, $39.99/yr |
Who we left off, and why
This page ranks consumer tracker apps you run yourself, not telehealth programs or web planners. Services like Found, Calibrate, and Ro bundle a prescription and coaching rather than a tracker, and web planners are calculators rather than daily loggers. If your goal is logging doses, watching the trend, and tracking peptides on your own phone, the five above are the real field as of July 2026.
How to actually choose
Start with the question you most want answered. If it is "did I take my shot and what did I eat," Shotsy or Pep will serve you well, and Shotsy's free tier makes trying it effortless. If it is "what are my estimated levels across a six-compound stack," that is Regimen's home turf. If it is "is this medication actually working for me, and what changed when it stopped," that question has exactly one app built around it.
The second filter is honesty about your own logging appetite. Apps that reward heavy logging punish the weeks you stop. WeightSnap's by-feel mode was built for those weeks: three taps a day still produces a verdict, recaps, and a Feel Report, and you can switch to full-detail tracking whenever the mood returns.
The last filter is sign-up tolerance. Regimen and Pep are account based, which is what powers their cross-platform sync and cloud features. Shotsy and WeightSnap work without an account, keeping your medication history on your device and in your private iCloud. If one more sign-up screen is one too many, that narrows the field to two.
Frequently asked questions
What is the best GLP-1 or peptide tracker app?
For popularity, Shotsy. For library depth and the heaviest logging, Regimen. For AI meal logging, Pep. For knowing whether the medication is working, for the least logging effort, and for peptide tracking, WeightSnap.
Which tracker tells you if the medication is working?
Only WeightSnap issues a verdict: Building, Working, Steady, or Worth watching, computed from your own trend and dose history, plus Stall Check and Wear-Off Detection. The others show charts and leave the reading to you.
What is the best app to track peptides and reconstitution?
WeightSnap and Regimen are the two built for peptides. WeightSnap has a 30+ peptide and blend library, custom compounds, a reconstitution calculator, and vial inventory, plus a working-or-not verdict; Regimen has the larger 200+ library with level curves. Shotsy allows custom entries but has no reconstitution or vial tooling.
What is the best app to track retatrutide, tirzepatide, or semaglutide?
All five track the mainstream GLP-1s and Zepbound, Mounjaro, Ozempic, and Wegovy. For research peptides you reconstitute yourself, like retatrutide, WeightSnap and Regimen are strongest because they include reconstitution and vial tooling, and WeightSnap adds a verdict on whether the dose is working. Glapp is a strong free, cross-platform pick if you only track GLP-1s.
Which tracker apps are free?
Shotsy's core logging is free forever; its curves and Health sync are premium from $9.99/mo. Regimen is fully free for one compound. Pep and WeightSnap are paid with trials: about 3 days and one full week respectively.
Which works without a wearable or food logging?
WeightSnap. Your iPhone supplies steps, weigh-ins take seconds to type or sync from a smart scale, and the daily check-in is three taps.
All numbers are based on public App Store and Google Play listings and each app's website as of July 2026. Shotsy, Regimen, and Pep AI are trademarks of their respective owners. Pricing changes; check each app for current numbers.
Head-to-heads: vs Shotsy · vs Regimen · vs Pep AI · vs Glapp · or read the complete WeightSnap guide.
Everything free for a week: the verdict, Stall Check, Wear-Off Detection, and by-feel tracking.
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