Best peptide tracker apps (2026): an honest comparison

How we compared these apps

We pulled data from Apple's public iTunes Search API in September 2026 for PeptidesAI and six of the most relevant peptide-focused tracker and calculator apps on the U.S. App Store: PeptidePal, Peptide Tracker Log & Reminder, Peptide Tracker & Calculator, Peptide Calculator: PepCalc, PepTracker: Dose Log and PeptIQ: Peptide Tracker. For each app we recorded the public rating and rating count, the listed price, the primary category, the most recent update date and the app's own description text. The features listed for each app are paraphrased closely from that app's description — nothing here is inferred from screenshots, reviews or our own use of the app.

That has a real limitation: an App Store description is written by the app's own developer, so it's a claim, not an independent test. We haven't verified that every listed feature works as described, and we haven't weighed in on build quality, bugs or customer support for any app but our own. What we can verify is what each listing actually says, and how that compares to what the others say — so treat the feature lists below as "the developer states X," not as our endorsement of X.

One note on categories: Peptide Calculator: PepCalc is listed under Apple's Medical category, while the rest — including PeptidesAI — are listed under Health & Fitness. That's a developer choice about where to surface the app, not a claim about accuracy or clinical review, but it's worth knowing if you're browsing the App Store's own category pages. All seven apps compared here are iPhone apps distributed on the U.S. App Store.

The comparison (as of September 2026)

Ratings and rating counts are U.S. App Store figures as of September 2026 and change over time. "In-app purchases" is noted only where the app's own description states a subscription or premium tier.

What to look for in a peptide tracker

Whichever app you pick, these are the things worth checking before you rely on it:

• Accurate reconstitution math with mcg/mg handling. The calculator should let you enter the vial amount and target dose in either unit and convert correctly. Mixing up mg and mcg is an easy mistake with a 1,000-fold error, so check that the app makes the unit you're entering obvious rather than assuming it.
• Vial concentration saved per vial. Once you've reconstituted a vial, the app should remember its concentration so you're not redoing the math for every draw, and should carry that concentration forward as the vial is used down.
• Dose logging. A record of what you actually took and when, separate from what was scheduled, so a missed or delayed dose doesn't just disappear from your history.
• Reminders. Notifications for upcoming doses and, separately, for vials nearing their expiry date — the two are easy to conflate but solve different problems.
• Injection-site rotation. A way to track where you last injected so you're not reusing the same site too often; several of the apps below present this as a visual body map rather than a list.
• Privacy and where your data is stored. Whether your protocol and health data stay on your device or are sent to a server, whether the developer says it sells or shares that data, and whether there's a way to export or delete it.
• Offline use. Whether the calculator and your logged data work without an internet connection — useful if you're doing the math at the moment you're drawing up a dose, not at your desk.

None of this is about which app is "best" in the abstract. A student running one compound off a single vial has different needs than someone managing several vials on different schedules, and the right app is the one whose feature list matches the actual protocol you're tracking.

The apps, one by one

PeptidesAI pairs the reconstitution calculator with a 70-compound research encyclopedia covering mechanism, half-life and research summaries for each compound. It adds dose logging with streaks, dose and vial-expiry reminders, an injection-site body map, vial inventory tracking and a built-in AI assistant for questions, with iCloud sync, Apple Health weight import, progress photos and a home-screen widget, in English and Spanish.

PeptidePal is the largest of the group by rating count and describes itself as used by over 150,000 people. Its listing frames it as built for full protocols rather than single doses: a protocol builder for dose, frequency and cycles, reconstitution math shown on a syringe diagram, an interactive body map for site rotation with recently used sites heat-mapped, and a library of 50+ compound profiles covering mechanism, half-life and reported side effects. Its description states that protocol tracking, the full library, advanced analytics and AI chat require a subscription, and separately mentions a moderated peer forum and an AI advisor that it says will not recommend a dose.

Peptide Tracker Log & Reminder has the highest rating of the group and describes itself as "100% free. No subscription. No paywall." Its listing highlights an estimated plasma-level curve based on logged doses and each compound's half-life, built-in calculators for reconstitution, syringe-unit conversion and premixed blends, vial and bacteriostatic-water inventory management, and a peer community where people can share structured answers about compounds under a username rather than a real name.

Peptide Tracker & Calculator, from the same developer as PepCalc, focuses on detailed vial record-keeping — concentration, vial size, reconstitution liquid, storage conditions, source, batch number and expiration date — plus smart low-stock alerts and an injection-site rotation map with customizable rest periods and color-coded site status. Its listing describes monthly and annual subscription options with a 3-day free trial on the annual plan, and states that data is stored locally on the device.

Peptide Calculator: PepCalc is the narrowest tool in the comparison: a dedicated calculator for dosage, reconstitution and insulin-syringe unit conversion, with no protocol builder, dose log, reminders or injection-site tracking described in its listing. Its description emphasizes a "clean & focused interface" with no ads, and it's the only app in this comparison whose most recent listed update was in 2025 rather than 2026.

PepTracker: Dose Log centers on a dose log and built-in calculator — enter vial amount, diluent volume and target dose to get mL or insulin-syringe units — for peptide, GLP-1 and TRT protocols, with reminders and a home-screen view of what's due that day. Its description lists an optional Premium upgrade that adds unlimited protocols and peptide stacking, extended calendar views, mood and energy tracking, and export to CSV or PDF with calendar sync.

PeptIQ: Peptide Tracker combines protocol scheduling — daily, weekly, cycling or custom, with pause and resume — with wellness tracking, logging weight, mood, energy and sleep alongside peptide use. Its listing also describes a reconstitution calculator for bacteriostatic water, a professional body map for progress and site tracking, and a half-life visualization it calls "an educational modeling feature." The description states peptide data is stored locally on the device and says the app does not sell personal or health data related to peptide use.

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