Built for precision
Every feature in PepStack is designed to eliminate guesswork from peptide research and self-experimentation.
Instant, precise dosing math
Reconstitution Calculator
Select your peptide, enter your vial size and BAC water volume, and PepStack instantly calculates the exact syringe markings for your desired dose. Supports all major syringe types including insulin syringes (U-100, U-40) and standard 1mL and 3mL syringes. No spreadsheets. No guessing.
Reconstitution Calculator
Calculator Detail
Build and track weekly schedules
Protocol Builder
Create multi-peptide protocols with specific dosing schedules for each day. Set injection times, frequencies, and cycle lengths. PepStack tracks your adherence and sends reminders so you never miss a dose. Stack multiple peptides into coordinated protocols.
Weekly Schedule
Stack Suggestions
Visual body map with rotation reminders
Injection Site Tracker
Log every injection with a tap on the interactive body map. PepStack tracks site history across 8 zones and recommends the next injection site to prevent tissue buildup. See injection frequency by zone and time since last use at a glance.
Injection Site Map
Log Dose Modal
Semaglutide & Tirzepatide step-up schedules
GLP-1 Titration Protocols
Follow clinically-informed titration schedules for GLP-1 receptor agonists. PepStack guides you through dose escalation with built-in step-up timelines, side effect tracking, and dose adjustment recommendations. Track your progress through each titration phase.
GLP-1 Titration Protocols
Track symptoms, discover patterns
Journal & AI Insights
Log daily symptoms, energy levels, mood, sleep quality, and custom metrics. PepStack analyzes your entries over time and surfaces AI-powered insights about correlations between your protocols and how you feel. Spot trends you would never catch manually.
Journal Main Hub
AI Insights
Your peptide research at a glance
Health Dashboard
A unified dashboard pulling together protocol adherence, injection history, journal trends, and health metrics. Integrated with Apple HealthKit to sync weight, body composition, and activity data alongside your peptide protocols for complete self-tracking.
Health Dashboard
Quick logging from your wrist
Apple Watch Companion
Log doses, check today's schedule, and view injection site recommendations directly from your Apple Watch. PepStack's watchOS companion keeps your protocol accessible without reaching for your phone.
Apple Watch
Light, Dark, and OLED modes
Theme System
PepStack adapts to your preference with three carefully designed themes. Light mode for bright environments, Dark mode for low-light use, and a true-black OLED mode that saves battery on OLED displays. Every screen is designed for all three modes.
Light Mode
Dark Mode
OLED Mode
See it for yourself
Download PepStack free. The calculator is available on the free tier.