OptiPin
OptiPin vs PepTracker
Two well-built iOS trackers with different philosophies: OptiPin leans into hormone forecasting and privacy; PepTracker into a simple, polished peptide dose log. Here's the honest breakdown.
The verdict
Choose OptiPin if you want blood-level forecasting, deeper TRT/estradiol/DHT modeling, inventory tracking, and on-device privacy.
Choose PepTracker if you want the simplest peptide dose log with clean syringe visuals and don't need hormone forecasting.
| OptiPin | PepTracker | |
|---|---|---|
| Platform | iOS | iOS |
| On-device · no account | ✓ | ~Cloud account |
| Peptide & GLP-1 tracking | ✓ | ✓ |
| TRT / E2 / DHT modeling | ✓Dedicated | ~Test dosing |
| Blood-level forecasting | ✓ | - |
| Calibrated T & E2 modelbloodwork-tuned, reference ranges | ✓ | - |
| Insight summariesdosing × Health × symptoms × labs | ✓plain-language | - |
| Titration with dose steps | ✓ | - |
| Dose / reconstitution calc | ✓200+ & blends | ✓Syringe view |
| Injection sites mapped | 115 | Standard |
| Progress photos | ✓ | - |
| Inventory tracking | ✓ | - |
| Bloodwork auto-import (Apple Health) | ✓ | - |
| Recovery score from your watchnightly, compared with your doses | ✓Apple Watch, Whoop, Oura | - |
| Weight / progress trends | ✓Health + symptoms | ✓Weight charts |
| App Store rating (US) | 4.8 · 171 | 4.7 · 451 |
| Multi-language (in-app) | ✓EN · DE · ES · PT | - |
| Free tier | 1 med free forever + 14-day full trial | 2 protocols |
| Price (US) | $4.99/mo · $39.99/yr | $4.99/mo · $47.99/yr |
Reflects publicly listed features as of June 2026, with ratings and prices re-checked 29 September 2026. Check each App Store listing for current features and pricing.
Where OptiPin wins
Blood-level forecasting. This is the biggest gap. OptiPin estimates testosterone, estradiol, DHT, and GLP-1 levels between draws with calculators calibrated to your bloodwork; PepTracker is a dose log and doesn't forecast pharmacokinetic levels.
Hormone depth and breadth. Dedicated, bloodwork-calibrated TRT/E2/DHT modeling with reference ranges, a 200+ compound library, blend expansion, 115 mapped injection sites, progress photos, and inventory tracking with low-stock alerts.
Protocol insights & smarter titration. OptiPin generates plain-language insight summaries linking your dosing, Apple Health data, symptoms/mood, and bloodwork – and titration schedules support automatic stepped dose changes. PepTracker offers neither.
Recovery from your watch. Since September 2026 it also reads your Apple Watch nights (or Whoop, Oura or Garmin data in Apple Health) into a nightly recovery score scored against your own last 60 nights. Health Trends then compares recovery on mornings after injection days with other mornings. It also compares HRV and sleeping heart rate in weeks on each compound against weeks off. PepTracker reads no wearable data.
Privacy. No account; data stays on your iPhone with optional iCloud Sync across your own Apple devices.
Where PepTracker wins
Simplicity and polish. If you only run a peptide or GLP-1 protocol and want a clean, fast dose log without deeper modeling, PepTracker's focused design is a genuine strength.
Social proof. It has a strong rating (4.7 from 451 US ratings) and a steady review base. It is no longer the most-reviewed peptide tracker: that is now PeptidePal.
Who should choose which
Running TRT or a multi-compound stack and want to see your levels and manage inventory privately? OptiPin. Want the simplest, most popular peptide dose log and don't need forecasting? PepTracker. Both are free to try.
Forecast your levels, not just your doses
14-day full trial, no account, all on-device.
Download on the App Store