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. OptiInsight, its AI engine, 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 AI-generated 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 AI 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.

How to choose

Pick on your top priority. The most capable, most private tracker (AI 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.