Peptide Tracker & Calculator is an iOS application designed for individuals tracking peptide and GLP-1 treatments, including semaglutide, tirzepatide, and other compounds. Its primary function is to help users organize dose schedules, log injections, manage inventory, and monitor health metrics, with all data stored locally on the device. The app requires no sign-up or server connectivity, though users may choose to enable optional sync. The app includes a comprehensive dose logging system that allows one-tap quick logs or detailed entries capturing amount, unit, time, injection site, and notes. Users can set daily, weekly, or interval reminders with start and end dates, pause schedules, and save reusable templates. For more complex protocols, the app supports multi-phase dose titration with custom durations, maintenance phases, and scaling, as well as on/off week therapeutic cycling with automatic phase status updates. A phase timeline visually displays titration ramps, maintenance periods, and pauses, showing active and upcoming phases. Injection site rotation across 13 or more zones is tracked along with rest days and site reactions. Side effects can be logged with severity, photos, interventions, and links to active compounds. Additional features include smart notifications with custom reminder templates and auto-cancel after logging, a missed dose detection that surfaces overdue entries from a lookback window, and iOS home and lock screen widgets showing the next scheduled dose and allowing logging without opening the app. The app includes a compound library of over 100 substances with half-life data, descriptions, categories, and scientific references. Users can add brand-name products such as Wegovy, Ozempic, and Mounjaro with pre-filled concentration, vial size, and titration information. The medication inventory tracks vials, pens, sprays, topicals, and orals, recording stock levels, expiry dates, batch numbers, price, and storage details. A compound builder supports pharmacy-compounded or custom blends with locked ratios and proportional scaling. The app also tracks bacteriostatic water volume, punctures, open date, expiry, and usage history. Typical use cases include managing a personalized peptide protocol under the guidance of a healthcare provider, logging doses over time, and generating provider-ready reports from the recorded data. The app runs on iOS devices and operates entirely offline, ensuring user privacy. No technical expertise is required beyond standard iOS app usage, and all features are accessible without an internet connection except when sync is enabled.