Current capabilities, pricing, methodology, privacy implementation, and platform support are unknown unless attributed to a current primary source. This page remains noindex during review.
Halflife: the current website documents an iOS app with dose logging, vial inventory, injection-site rotation, calculators, and 44 public compound profiles. Its estimated remaining-level curves are mathematical estimates based on selected half-life values; they are not measured blood concentrations. Android availability is not known from the current Halflife website.
Regimen: Regimen's public materials state that it supports iOS and Android, more than 150 compounds, pharmacokinetic curves, four calculators, lab tracking, health-platform integrations, and exportable reports. Halflife Labs has not independently verified those capabilities.
Shotsy: Shotsy's public materials state that it supports iOS and Android, estimated medication levels, GLP-1 dose history, side-effect and progress tracking, PDF exports, dose planning, and injection-site rotation. Halflife Labs has not independently verified those capabilities.
Current feature parity, pricing, reliability, calculation methodology, privacy implementation, customer-support quality, and the accuracy of vendor-reported capabilities are not known unless a cited primary source explicitly establishes them. No app is declared the universal “best” here.
Halflife calculates an estimated remaining percentage using published or explicitly labeled lower-confidence half-life inputs. The true concentration in an individual is unknown without appropriate measurement. Absorption, distribution, metabolism, route, formulation, dose timing, and individual physiology can make the true value differ from the estimate.
Last fact-check date: June 11, 2026. This page will remain noindex until each comparison claim has a current primary-source citation and a documented review method.