I built a small personal-log tool and wanted to describe it plainly rather than pitch it.
GLP1 App (App Store name: Peptide Tracker & Calculator) is a free iOS app by David Dzeveckij for keeping your own record of GLP-1 doses, weights and notes. It is iOS-only (iOS 16.4+), the interface is English-only, it is closed-source, and it is local-first: entries stay on the device unless you export them yourself. There is no Android, web or macOS version and no beta.
It is a notebook with arithmetic in it, nothing more. It does not prescribe, recommend, adjust or supply anything, and it is not medical advice.