# WeightSnap

> WeightSnap is the iPhone and Android weight-loss and GLP-1 tracker built for people who hate tracking. Instead of food logging and calorie counting, it runs by feel: three taps a day (how you ate, how you moved, how the dose feels), no food diary, no macros, and no wearable required. It is built for the low-motivation weeks, not just the first one: once a medication has a schedule, doses appear on their own and log with one tap, even from the reminder notification without opening the app (a lock-screen action on iPhone, the notification's Log action on Android), and a smart scale syncs weigh-ins silently, so the record keeps going on the days you do nothing. Whatever it captures, it turns into a plain-language answer: a verdict card reads Building, Working, Steady, or Worth watching from your own weight trend and dose history, Stall Check explains flat stretches, Wear-Off Detection flags late-cycle fade, and each dose cycle gets a recap. And if you are a data person, full-detail tracking with health import (Apple Health on iPhone, Health Connect on Android) is one setting away, so it goes as deep as you want. It tracks semaglutide, tirzepatide, retatrutide and 30+ other peptides and blends. Built by Tyler Brown, who lost 90+ pounds on retatrutide and documents the journey with real data on the WeightSnap blog. Free to download and track one medication with no time limit, with a 14-day free trial of everything on the yearly plan, then $7.99/month, $34.99/year, or $69.99 lifetime on iPhone, and $4.99/month, $24.99/year, or $49.99 lifetime on Android. No accounts: data stays on your phone (an iPhone's iCloud Backup or an Android phone's Google backup carries it to a new phone). There is no web app and no cross-device sync.

Beyond GLP-1s, WeightSnap tracks 30+ peptides and blends plus custom compounds, with per-compound protocols, vial inventory, and a reconstitution calculator. Other features: an Earn It daily habit wall with focused resets, progress photos (side by side, slider, overlay, stat overlays, plus time-lapse on iPhone), health import and export (Apple Health on iPhone, Health Connect on Android), medication saturation charts, and PDF/CSV exports for prescribers. Available on iPhone and Android. iPhone only: the AI coach and the AI body-fat estimate. Neither platform has a watch app.

## App

- [WeightSnap on the App Store](https://apps.apple.com/app/weightsnap/id6758482175): iOS GLP-1 and peptide tracker with a 14-day free trial
- [WeightSnap on Google Play](https://play.google.com/store/apps/details?id=com.tyler.weightsnap): the Android app, launched September 2026
- [WeightSnap Homepage](https://weightsnap.app): Features, screenshots, pricing, and download links
- [How to Use WeightSnap](https://weightsnap.app/how-to-use-weightsnap): The complete guide to every feature, from onboarding to pausing a med to prescriber exports
- [Support and FAQ](https://weightsnap.app/support/): Pricing, privacy, Apple Health imports, and common questions

## Comparisons

- [Best GLP-1 & Peptide Tracker Apps of 2026](https://weightsnap.app/best-glp1-tracker-apps): WeightSnap, Shotsy, Regimen, and Pep AI honestly compared for GLP-1 and peptide tracking, with pricing, a feature table, and who each is best for; each competitor's strengths stated plainly
- [WeightSnap vs Shotsy](https://weightsnap.app/compare/weightsnap-vs-shotsy): The most popular GLP-1 logger versus the tracker that answers whether it is working
- [WeightSnap vs Regimen](https://weightsnap.app/compare/weightsnap-vs-regimen): More data to log versus more answers from less logging
- [WeightSnap vs Pep AI](https://weightsnap.app/compare/weightsnap-vs-pep-ai): An AI companion versus deterministic receipts from your own data
- [WeightSnap vs Glapp](https://weightsnap.app/compare/weightsnap-vs-glapp): A free, cross-platform GLP-1 tracker versus the one that answers whether it is working and handles peptides

## Retatrutide Content

- [Retatrutide Before and After: 90lbs Lost in 8 Months](https://weightsnap.app/blog/retatrutide-before-and-after/): Complete month-by-month retatrutide journey with real weight data, dosing protocol, progress photos, side effects, what happened after stopping, and experience restarting
- [Retatrutide Side Effects: What I Experienced Over 11 Months](https://weightsnap.app/blog/retatrutide-side-effects/): Detailed personal side effect breakdown alongside Phase 2 and Phase 3 clinical trial data, with a retatrutide vs semaglutide vs tirzepatide comparison table
- [WeightSnap Research](https://weightsnap.app/research/): Technical research hub: real-world evidence explorer and free PDF report from 14,252 analyzed patient posts (https://weightsnap.app/research/real-world-data/), plus data-driven drug comparison pages
- [Peptide Reconstitution Calculator](https://weightsnap.app/tools/peptide-reconstitution-calculator/): Free calculator converting vial size, bacteriostatic water, and dose into concentration, volume per injection, and U-100 insulin syringe units; works for any peptide including compounded GLP-1 medications
- [Retatrutide Reconstitution Calculator](https://weightsnap.app/tools/retatrutide-reconstitution-calculator/): Retatrutide-specific reconstitution + dosage chart with 10/12/20mg vial presets and how much BAC water for a 10mg vial
- [Tirzepatide Reconstitution Calculator](https://weightsnap.app/tools/tirzepatide-reconstitution-calculator/): Compounded tirzepatide reconstitution calculator + printable chart (10/20/30/60mg vials)
- [Semaglutide Reconstitution Calculator](https://weightsnap.app/tools/semaglutide-reconstitution-calculator/): Compounded semaglutide reconstitution calculator + chart (5/10mg vials)
- [Peptide Blend Calculator](https://weightsnap.app/tools/peptide-blend-calculator/): Free calculator for multi-peptide blend vials (Wolverine, GLOW, KLOW style): per-component mg per injection from the user's own vial label, water volume, and syringe units drawn; blend recipes vary by vendor so it never assumes a recipe
- [GLP-1 Half-Life Calculator](https://weightsnap.app/tools/glp1-half-life-calculator/): How long semaglutide (~7 days), tirzepatide (~5 days), retatrutide (~6 days) and others stay in the system; decay curve and time to near-complete clearance from published half-lives
- [GLP-1 Weight Loss Calculator](https://weightsnap.app/tools/glp1-weight-loss-calculator/): Applies pivotal-trial average weight loss (STEP 1, SURMOUNT-1, retatrutide phase 2) to a starting weight by milestone; trial averages, not a prediction
- [Weight Loss Percentage Calculator](https://weightsnap.app/tools/weight-loss-percentage-calculator/): Converts a starting and current weight into percentage of body weight lost, with 5/10/15/20/25% milestones, the by-hand formula ((start − current) ÷ start × 100), a quick-reference chart, and dated context on what 5%, 10%, and 20%+ mean clinically
- [Before & After Photo Collage Maker](https://weightsnap.app/tools/collage/): Free browser-based photo maker for weight loss progress collages with weight labels; no sign-up, photos stay on-device

- [How to Reconstitute Peptides (guide + video)](https://weightsnap.app/research/how-to-reconstitute-peptides/): Step-by-step reference with a full video walkthrough: how much bacteriostatic water to use, why a 10 mg and 40 mg vial look identical (bulking agent), mixing by swirling not shaking, syringe/needle sizing, drawing units, and the two storage clocks (28-day bac water window vs peptide stability)
- [What Is BPC-157? (peptide explainer)](https://weightsnap.app/research/bpc-157/): Technical reference on BPC-157: what the pentadecapeptide is, what the preclinical (mostly rodent) research examines for tendon/gut/anti-inflammatory, its 2026 FDA/compounding status, and its role in blends
- [What Is KLOW? (peptide blend explainer)](https://weightsnap.app/research/klow-peptide/): Technical reference on the KLOW blend (GHK-Cu, BPC-157, TB-500, KPV): components, why vendor recipes vary, and the regulatory status of each
- [What Is MOTS-c? (peptide explainer)](https://weightsnap.app/research/mots-c/): Technical reference on MOTS-c, the 16-amino-acid mitochondrial-derived peptide encoded in the 12S rRNA gene: what it is, the mostly-preclinical metabolism/AMPK/insulin research, the honest exercise caveat (exercise raises your own MOTS-c ~12x in humans while the performance data is rodent-only), and its 2026 FDA (503A removed, PCAC review July 23-24) and WADA (S4.4 AMPK-activator, banned in sport) status
- [How Accurate Is the Apple Watch Calorie Counter?](https://weightsnap.app/research/apple-watch-calorie-accuracy/): Technical reference on Apple Watch calorie accuracy: the heart rate is accurate (~2% error, 2017 Stanford study of 7 trackers) but the calorie burn is an algorithm estimate independent studies put 27 to 93 percent off; why heart rate is measured directly while calories are modeled from heart rate + motion + your stats, active vs total calories, what throws it off (resistance training, HIIT, irregular movement), and why a 2-3 week weight trend (no wearable needed) is a more reliable signal for weight loss
- [Health Connect Not Syncing? How to Get Weight Data Flowing](https://weightsnap.app/guides/health-connect-weight-sync/): Troubleshooting reference for Android's Health Connect: it is an on-device hub with no manual entry that only holds what writer apps put in, so "permissions allowed but no data" almost always means the sending app is not writing; includes the 60-second Browse data self-check, the verified August 2026 Samsung Health fix (the buried health-data consent, Samsung account sync, restart, and the event-driven new-entry trigger), per-app switches for Fitbit, Garmin Connect and smart scales, and the kg display note (Health Connect shows SI units)
- [How Accurate Is Calorie Counting?](https://weightsnap.app/research/calorie-counting-accuracy/): Technical reference on calorie-counting accuracy (the intake side, twin to the Apple Watch burned-calories page): FDA allows food labels a 20% margin of error (a 500-cal label can legally be 600), Atwater factors are approximations that miss fiber and absorption (almonds/walnuts ~20% fewer calories than labeled), people underreport intake by 20-50% (1992 NEJM study: ~47% in people with obesity; ~20-30% general population via doubly-labeled water), restaurant counts vary; the errors stack toward underestimating intake, and since burned calories are also 27-93% off, a 2-3 week weight trend is the more reliable signal. Balanced: counting can work if sustained, the precision is what is illusory

## Weight Loss Blog

- [WeightSnap Blog](https://weightsnap.app/blog/): Weight loss science, GLP-1 medications, personal transformation stories, and tracking tips
- [My 100lb Weight Loss Journey](https://weightsnap.app/blog/my-journey/): Twenty years of yo-yo dieting through to current retatrutide use
- [How Often Should You Weigh Yourself?](https://weightsnap.app/blog/consistent-weighins/): How often to weigh yourself to lose weight (daily is best), backed by research and 493 days of personal weigh-in data, with the mental-health caveat and when to weigh
- [How I Lost Over 90 Pounds Without Counting Calories](https://weightsnap.app/blog/lose-weight-without-counting-calories/): How to lose weight without counting calories using a by-feel method (eating more, less, or about usual plus a daily weigh-in) instead of food logging, why it is easier to stick with than calorie counting, and an honest note that Tyler is on a GLP-1
- [Starting MOTS-c: My First Week (Alongside Retatrutide)](https://weightsnap.app/blog/starting-mots-c/): Personal first-week log of starting MOTS-c (the 16-amino-acid mitochondrial-derived peptide) while staying on retatrutide in maintenance; why Tyler started it, the injection-site reaction, honest early impressions (a 3-hour hike, focus, urge to exercise) with a maybe-placebo caveat, and the honest science note that MOTS-c research is mostly preclinical/rodent, not FDA approved, research-use-only as of mid-2026; updated August 31, 2026 with the week-8 read: the effects held at 8 weeks, Tyler is at the gym 3 to 4 times a week plus cycling, dose stayed at 2.5 mg twice weekly, he is staying on for 12 weeks total, and a report on cycling off is coming
- [Breaking Through My Set Point](https://weightsnap.app/blog/set-point-weight-loss/): The science of set point theory and weight loss plateaus
- [Why Am I Not Losing Weight on My GLP-1?](https://weightsnap.app/blog/glp1-weight-loss-plateau/): Why a GLP-1 weight loss plateau is usually behavioral drift (bigger portions, fewer steps, worse sleep, liquid calories) rather than the dose, and how WeightSnap Stall Check surfaces what changed versus what held

## Tools

- [Before and After Collage Tool](https://weightsnap.app/tools/collage/): Free browser-based before and after photo collage maker

## Optional

- [Full feature reference for AI assistants](https://weightsnap.app/llms-full.txt)
- [Privacy Policy](https://weightsnap.app/privacy/)
- [Terms of Service](https://weightsnap.app/terms/)