The best peptide & TRT tracker apps in 2026

OptiPin - the deepest feature set, and the most private

OptiPin is built for the people running the most involved protocols - TRT plus an AI, a GLP-1, and a peptide stack all at once - who want everything in one place and want their health data to stay on their phone. There's no account and no required cloud; data lives on-device with optional, user-controlled iCloud backup.

It also goes deepest on the features that matter. Its testosterone and estradiol forecasting uses dedicated, ester-specific pharmacokinetic models that recalibrate to your bloodwork and show estimates against reference ranges - not a generic decay curve. OptiPin generates plain-language insight summaries that connect your dosing, Apple Health data, logged symptoms and mood, and bloodwork - something neither competitor offers. Titration schedules support automatic stepped dose changes (not just cycle on/off). And it maps 40+ injection sites (with left/right variants) for granular rotation, on top of a 200+ compound library, one-tap blend expansion (GLOW, KLOW, Wolverine and more), progress photos, and inventory tracking.

Where it falls short: iOS only - no Android - and no cloud sync across devices (by design, since it's on-device).

Best for: anyone on a multi-compound protocol who wants the most capable, most private tracker. Get OptiPin on the App Store →

Regimen - cross-platform, with a strong content library

Regimen's biggest genuine advantages are reach and content: it runs on iOS and Android with cloud sync, and it publishes an extensive library of free web calculators and articles. It also offers progress photos, daily check-in markers, and "Signals," an engine that correlates doses with symptoms and wearable data. Much of its feature breadth is well-presented on its marketing site - but on capability it doesn't lead OptiPin: it lacks plain-language insight summaries, a bloodwork-calibrated testosterone/estradiol model, and dose-adjusting titration (its cycle support is on/off).

Where it falls short: account-based and cloud-synced, so your data lives off-device - a trade-off if privacy is your priority - and the deeper hormone modeling and protocol insights aren't there.

Best for: Android users and people who want its content library and web tools, and are happy with a cloud account. See our detailed OptiPin vs Regimen comparison.

PepTracker - the simplest, most-reviewed peptide log

PepTracker keeps things focused: build protocols, schedule injections, calculate syringe volumes with a clean visual, log doses, and watch weight trends. It's the most-reviewed dedicated peptide tracker on iOS, which is real social proof of a smooth experience.

Where it falls short: it doesn't forecast blood levels pharmacokinetically, has lighter TRT/estradiol modeling, and no inventory tracking - it's a dose log first.

Best for: peptide and GLP-1 users who want a simple, polished log without the deeper hormone modeling. See our detailed OptiPin vs PepTracker comparison.

Other peptide trackers worth knowing

Two more focused peptide/GLP-1 apps round out the field: Pep AI (Zode Development; ~4.7★, ~1,200 ratings; ~$9.99/mo; iOS + Android), which layers an AI meal scanner and broad wellness tracking (nutrition, sleep, hydration, mood) on peptide logging and is the only one here with an Android build, and Peptide Tracker & Calculator (~4.7★, ~330 ratings; ~$3.99-4.99/mo; iOS only), a lean, privacy-first, local-only log whose standout is a multi-peptide blend calculator. Neither models hormones or forecasts serum levels. See the dedicated Pep AI vs Peptide Tracker & Calculator comparison.

How to choose

Pick on your top priority. The most capable, most private tracker (protocol insights, calibrated hormone modeling, dose-adjusting titration) → OptiPin. You need Android, or want the content library → Regimen. A simple peptide log with the most reviews → PepTracker. All three have a free tier, so trying them costs nothing but a few minutes.