The Rankings
Protocol — Peptide, TRT & GLP-1 Tracker
iOS + Android 9.2 / 10Protocol leads the category in 2026 — not narrowly, but categorically. The feature set is deeper than every competitor combined: Custom Draw reconstitution mode (the only free calculator that works backwards), PK half-life plotter for 22 compounds, TRT ester calculator, stack cost calculator, 3D injection site body map, bloodwork tracking, AI research features at 6 touchpoints, and an 81-compound research library. Android launch in May 2026 closed the one gap that existed.
The 5.0 App Store rating across hundreds of reviews reflects genuine user satisfaction, not recency. On-device privacy, no account required, and stealth mode serve the portion of the user base that wants maximum discretion. Full feature depth on the free tier.
Dose
iOS onlyThe best visual design in the category. Alec Smith built an app with genuine aesthetic conviction — lock screen widgets, clean hierarchy, and thoughtful interaction design. Side effect tracking is well-implemented. The significant limitation is the calculator suite — basic reconstitution only, no Custom Draw, no PK plotter, no TRT ester calculator. iOS only. For users who prioritize design and are happy on iOS with simple protocols, Dose is worth evaluating.
PepTracker
iOS onlySolid for beginners. Template library, clean onboarding, and a free 2-protocol tier that covers most simple use cases. Missing Android, Custom Draw, PK modeling, bloodwork tracking, and injection site rotation. The PDF export for sharing results with a prescriber is a useful feature. Grows limiting as protocol complexity increases beyond 2 compounds.
Hacksmith Peptalk
Web onlyGenuinely unique price comparison database across 190+ peptides. Not a tracking app — no logging, no injection scheduling, no dose history. The right tool for pre-purchase research; the wrong tool for protocol tracking. Web-only.