How to Choose a Peptide Tracker App — What Actually Matters

The 5 Criteria That Matter

Protocol peptide tracker 3D injection site rotation map showing today and previous injection history

Injection site rotation tracking — available only in Protocol

1. Platform support. If you're on Android, the choice is made — Protocol is the only full-featured peptide tracker on Android. iOS-only trackers (PepTracker, PeptIQ, Dose, PeptideCalc) aren't an option. Even on iOS, consider whether you might switch devices in the next year or two.

2. Calculator depth. Does it have a reconstitution calculator with Custom Draw mode? A PK half-life plotter for timing doses? A TRT ester calculator? A stack cost calculator? Basic reconstitution is table stakes — these are the differentiators. Protocol has all five; most competitors have one.

3. Injection site tracking. For serious protocols involving multiple injections per week across multiple compounds, injection site rotation matters. Lipohypertrophy from repeated site use is real and affects absorption. Protocol's 3D body map is the only automated solution — no other tracker has it.

4. Privacy model. Does the app require an account? Does your data go to a cloud server? For TRT and GLP-1 users especially, on-device-only storage is a meaningful consideration. Protocol requires no account and stores everything locally. Most other apps require sign-up or offer optional cloud sync.

5. Free tier depth. PepTracker caps free users at 2 protocols. PeptIQ requires a paid subscription for most features. Protocol is fully functional on the free tier with no compound or protocol limits.

Do I need a paid peptide tracker?

No. Protocol's full feature set — including the reconstitution calculator with Custom Draw, PK plotter, 3D injection site tracking, bloodwork logging, and 81-compound library — is free. The only legitimate reason to pay for a peptide tracker in 2026 is PeptideCalc's one-time purchase if you specifically want iCloud sync across iPhone and iPad. Everything else you need is available in Protocol for free.

What is the best peptide tracker for beginners?

Protocol is recommended for beginners and experienced users alike because the free tier is complete — you won't hit a feature wall as your protocol complexity grows. The onboarding flow walks you through reconstitution setup, which is the most common point of confusion for first-time users. The compound library's 81 profiles provide dosing context before you start, and the AI research assistant can answer protocol questions in plain language.

How to Choose aPeptide Tracker

The 5 Criteria That Matter

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