Halflife vs StackDays

If tirzepatide, peptides, TRT, insulin, nootropics, and longevity compounds are part of the same protocol, fragmentation becomes the limiting factor. Halflife unifies multi-compound protocols into a single system for dosing, pharmacokinetics, adherence, inventory, and real-world performance tracking. Core System Tracks complete protocol stacks across GLP-1 medications, recovery peptides, growth hormone secretagogues, testosterone replacement, insulin, nootropics, sexual health agents, and longevity compounds in one environment. Every compound is logged within a unified timeline with dose history, vial stock, and schedule position. Concentration Curves Uses published pharmacokinetic data from FDA labels and peer-reviewed research to model active compound levels over time. Each compound is displayed as a live curve showing time to peak, current activity as a percentage of peak, and clearance trajectory. Biological effect windows model downstream activity for short half-life peptides. Today Screen Central execution layer for all protocols. Shows due doses, week progression, remaining vial inventory, and one-tap logging. Injection site rotation tracked automatically. Integrated syringe calculator converts vial concentration and target dose into exact draw volume. Protocol Tools Synergy Matrix, Reconstitution calculator, Unit converter, Vial runway calculator, Adherence circle. Compound Database Medically cited library covering tirzepatide, semaglutide, BPC-157, TB-500, CJC-1295, ipamorelin, testosterone esters, insulin, nootropics, and longevity compounds. Biometric Intelligence Apple Health integration connects sleep, HRV, heart rate, and weight trends with dosing history. Community System Pods, Challenges, Daily polls, Community discovery. Data Model All data stored locally on device. Nothing transmitted externally. 45 substances across GLP-1s, peptides, GH secretagogues, TRT, insulin, nootropics, sexual health, and longevity stacks. Free tier: two compounds, full logging, weight tracking, 4 free tools, Adherence Calculator, Community Access. Advanced unlocks unlimited protocols and full analytics. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://halflife-labs.com/privacy/

StackDays is the habit tracker you actually stick with, because you're not doing it alone. Build daily habits, grow your streak one day at a time, and keep your friends accountable right alongside you. Whether you want to drink more water, read every night, train for a race, meditate, study or just build a better routine, StackDays turns small daily wins into a streak you won't want to break. STACK YOUR DAYS - Check off habits in one tap and watch your streak grow - Track anything: a simple daily check-in, or a number like kilometres, minutes, reps, pages or glasses of water - Every day, a few times a week or a few times a month: set the schedule that fits - Give each habit its own goal, colour and emoji - Forgot to log yesterday? Tap the day and fix it - Drag to reorder your habits and Home sections STAY ACCOUNTABLE WITH FRIENDS People follow through far more often when someone is watching. StackDays makes that visible every day. - Add friends with a simple invite code and see each other's streaks - Run challenges together with shared habits, a start and end date, and a live leaderboard - Team chat inside every challenge - Get a nudge when a friend passes you SEE YOUR PROGRESS - Day, week and month views of everything you log - A 12-week consistency heatmap - Your strongest and weakest weekdays - A calendar for every habit that shows your streaks as connected runs - Monthly completion trends - Printable PDF months and shareable streak cards PROTECT YOUR STREAK - Streak powers rescue a missed day (three new ones every month) - Vacation mode pauses everything while you're away - Habit reminders at the times you choose - A heads-up before a streak you've earned is at risk CELEBRATE MILESTONES Badges and milestone ladders unlock as your streaks grow, from your very first day onwards. MAKE IT YOURS - Light, dark or automatic theme - Six accent colours, or pick your own - Four text sizes and optional haptics - Apple Health sync for steps, distance and workout minutes PRIVATE BY DESIGN No ads, and your data is never sold. Export your months as PDF, or delete your account whenever you like. ONE PLAN, EVERYTHING INCLUDED StackDays is one subscription with every feature. Monthly and yearly plans start with a 3-day free trial: cancel before it ends and you won't be charged. A one-time lifetime purchase is also available. Payment is charged to your Apple Account when you confirm the purchase, or when the trial ends. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel any time in your App Store account settings. Terms of Use (EULA): https://stackdays-efb6b.web.app/terms.html Privacy Policy: https://stackdays-efb6b.web.app/privacy.html Stack up your days, one habit at a time.