Stack vs Peptra

Stack is the all-in-one tracker for peptides, GLP-1 medications, and TRT protocols. Log every injection, build custom dosing schedules, track your progress, and keep your full history organized in one private place. Built for adults working with a prescribing healthcare provider, Stack replaces scattered notes and spreadsheets with a simple, consistent system you control. You enter your own values (peptide name, dose, schedule, and sites) and Stack keeps them organized, reminds you, and shows your progress over time. FEATURES • Custom Protocols & Stacks — Build your own multi-peptide protocols with flexible schedules (daily, weekly, every X days, or custom). Run multiple stacks at once, each clearly organized. • Smart Dose Logging — Log every injection in seconds and see what's due today on your Home screen and calendar. A daily streak keeps you consistent. • Reconstitution Calculator — Take the guesswork out of mixing. Enter vial amount, diluent volume, and target dose to get the exact mL or insulin-syringe units to draw. • Vial & Refill Tracking — Set how much each vial holds, watch it deplete with every dose, and refill in one tap. A tap-to-flip ring shows the exact percentage remaining. • Injection Site Tracker — Rotate sites with an interactive body map that remembers your recent spots, so you can avoid reusing the same area. • Apple Health Sync — Pull in weight, BMI, resting heart rate, HRV, sleep, steps, active energy, blood pressure, respiratory rate, body fat, lean mass, and VO2 max to see the full picture. • Progress Photos & Compare — Capture progress photos and view them side by side with weight and date overlays. Hide weight for privacy, then share a branded comparison. • Meal Scan — Snap a photo of your meal to estimate macros and keep nutrition alongside your protocol. • AI Assistant — Ask questions about your active stacks and protocols in a private chat built into the app. • Metrics & Insights — Clean charts and stats show how your protocol is trending over time. • Home Screen Widget — See your next dose and stay on track without opening the app. • Shareable Protocol Card — Generate a clean, branded card of your active protocol to save or share. PRICING Stack requires a subscription to unlock the full experience. IMPORTANT Stack is a personal record-keeping and organization tool for informational purposes only. It does not provide medical advice, diagnosis, or treatment, and is not a substitute for professional care. Always consult a qualified healthcare provider before starting, changing, or stopping any medication or protocol. Terms of Use (EULA): https://www.whatsyourstack.app/terms.html Privacy Policy: https://www.whatsyourstack.app/privacy.html Questions or feedback? Email us at contact@whatsyourstack.app.

Track peptides and GLP-1 doses in one place — free to try, no paywall before you've logged your first dose. Peptra is the record-keeping app for anyone managing an injection routine — GLP-1 medications, research peptides, or both. No spreadsheets, no guessing, no losing your history. COMPOUND LIBRARY Preloaded reference data for common GLP-1 medications (semaglutide, tirzepatide, retatrutide, liraglutide) and dozens of commonly discussed peptides (BPC-157, TB-500, CJC-1295, ipamorelin, and more), with educational summaries and typical units. Or add any custom compound with your own name, units, and notes. Start a protocol without typing in pharmacology data yourself. PROTOCOLS & SCHEDULING Daily, every-N-days, specific weekdays, weekly, twice-weekly, 5-on/2-off, or a fully custom pattern. Set up cycles with weeks-on/weeks-off, or a stepped ramp with reminders that follow each step. Run multiple protocols at once, each with its own schedule. DOSE LOGGING, YOUR WAY Log a dose in one tap, or log it hours or days later — backdating is fully supported. Every entry is editable and deletable after the fact, and your vial inventory recalculates automatically whenever you correct a log. Nothing is locked in. BLENDS DONE RIGHT If you draw from one vial with multiple peptides mixed together, Peptra logs it as a single injection while tracking the per-ingredient math behind the scenes — no forcing you to log the same shot three times. CONCENTRATION CONVERTER Enter how much is in the vial and how much liquid you added, and Peptra converts it to units on your syringe, with a live illustration and a warning if you are over capacity. Save the result straight into a vial record. This is unit arithmetic on numbers you enter — Peptra never suggests what to take or how much. VIAL INVENTORY Track fill amount, concentration, remaining volume, and expiry for every vial, with a run-out alert before you'd come up short based on your actual schedule. MEDICATION LEVEL INSIGHTS For compounds with published half-life data, see an estimated level curve — how much is still active in your system between doses. REMINDERS THAT WORK OFFLINE Local notifications tell you what's due and let you log directly from the notification. No internet connection required. BUILT ON TRUST Your data commits to your device the instant you log it, so a bad connection never costs you a dose record. What you log stays on your device — no account, no servers holding your health data, no ads, and no tracking across apps or websites. If you subscribe, our payments provider processes your purchase history and an anonymous identifier so your subscription restores across your devices; it is never joined to anything you log. FREE, HONESTLY Unlimited dose logging, one active protocol, reminders, the concentration converter, two vials, and the site map are free forever. Premium unlocks unlimited protocols and vials, blends, and level-curve insights — with a free trial and a real free tier underneath it, not a paywall wearing a demo's clothes. Peptra is a personal record-keeping and education tool. It does not provide dosing advice, titration recommendations, or medical guidance, and it does not link to or facilitate purchasing of any compound. Always consult a licensed healthcare provider for medical decisions. Terms of Use (EULA): https://peptra-7km.pages.dev/terms Privacy Policy: https://peptra-7km.pages.dev/privacy Questions or something broken? We read and answer support email within 48 hours.