OptiPin
Pep AI vs Peptide Tracker & Calculator
Two of the most popular peptide and GLP-1 trackers on iOS, compared honestly — Pep AI's AI-powered wellness suite versus Peptide Tracker & Calculator's lean, private, blend-focused log. We also show where OptiPin fits if you need hormone modeling and blood-level forecasting.
The verdict
Pick Pep AI if you want the broadest tracking suite — AI meal scanning, nutrition, sleep, hydration and mood layered on peptide logging — and you want it on Android as well as iPhone.
Pick Peptide Tracker & Calculator if you want a focused, private, inexpensive peptide log with a strong multi-peptide blend calculator and bloodwork photo scanning, and you're on Apple devices.
Pick OptiPin if you also run TRT, HRT, or anabolics and want blood-level forecasting calibrated to your labs, testosterone/estradiol/DHT modeling, and an app in English, German, Spanish, and Portuguese.
| OptiPin | Pep AI | Peptide Tracker & Calc | |
|---|---|---|---|
| Platform | iOS | iOS + Android | iOS / Apple |
| Peptide & GLP-1 tracking | ✓ | ✓ | ✓ |
| TRT / E2 / DHT modeling | ✓Dedicated | — | — |
| Blood-level forecastingserum estimate calibrated to your labs | ✓ | ~Half-life estimator | ~Half-life chart |
| Dose / reconstitution calc | ✓200+ & blends | ✓ | ✓Strong blends |
| Multi-peptide blend calcseveral compounds, mixing ratios | ✓Stack expansion | ~ | ✓Up to 4 |
| AI insight summariespatterns across your data | ✓OptiInsight | ✓+ meal scanner | — |
| Nutrition / sleep / hydration | ~Apple Health | ✓Built-in suite | — |
| Injection-site rotation | 40+ sites | ✓Body map | ✓Smart rest |
| Inventory tracking | ✓ | ✓ | ✓Detailed |
| Bloodwork tracking | ✓Calibrates model | — | ✓Lab photo scan |
| Apple Health integration | ✓ | ✓ | ✓ |
| Progress photos | ✓ | ✓ | ✓ |
| Side-effect / symptom tracking | ✓ | ✓15+ linked | ~ |
| On-device / privacy-first | ✓No account | ~iCloud sync | ✓Local-only |
| Multi-language (in-app) | ✓EN·DE·ES·PT | —English | —English |
| App Store rating | Growing | 4.7 · ~1.2k | 4.7 · ~330 |
| Price (approx) | $4.99/mo · $39.99/yr | ~$9.99/mo | ~$3.99–4.99/mo |
| Free tier / trial | 1 med free + 14-day trial | 3-day trial | 3-day trial |
Reflects publicly listed features and approximate US pricing as of June 2026. Competitor prices and trials vary by tier and region — check each App Store listing for current details. A ~ means partial or different in scope (see notes below).
Pep AI: the all-in-one wellness tracker
Pep AI (by Zode Development) is the broadest of the three. Beyond dose logging, injection-site rotation, a reconstitution calculator and a 75+ compound research library, it bundles a full wellness suite: an AI meal scanner, nutrition and macro logging, hydration, sleep, weight trends and daily mood/energy check-ins, with AI insights that correlate patterns across all of it. It's also the only one of the three with an Android version, and it carries the largest review base (around 1.2k ratings at 4.7 stars). Its pharmacokinetic view estimates half-life and peak timing, but it does not calibrate a blood-level forecast to your own labs, and it does not model TRT, estradiol, or DHT. It's the priciest of the three at roughly $9.99/month.
Choose Pep AI if you want one app for peptides plus broad lifestyle tracking (food, sleep, hydration), you like AI-assisted logging, or you need Android.
Peptide Tracker & Calculator: lean, private, blend-first
Peptide Tracker & Calculator (by David Dzeveckij) is the focused, privacy-first option. It keeps data local on-device, and its standout is a genuinely strong multi-peptide blend calculator — combine up to four compounds in one vial with proportional dose math and mixing ratios — alongside detailed inventory (concentration, batch, expiry, storage), smart injection-site rotation with rest periods, progress photos, half-life charting, and bloodwork tracking with lab-result photo scanning. It has no AI features and no hormone modeling, but it's frequently updated and usually the cheapest, around $3.99–$4.99/month.
Choose Peptide Tracker & Calculator if you run multi-compound peptide blends, want everything local with no account, and want the lowest price.
Where OptiPin is different
Both apps above are well-built peptide/GLP-1 logs. OptiPin overlaps on the basics — logging, scheduling, reconstitution, inventory, site rotation, progress photos — but adds the layer neither competitor offers:
Blood-level forecasting, calibrated to your labs
OptiPin estimates testosterone, estradiol, DHT, and GLP-1 levels between blood draws, and tunes those curves to the lab values you enter. Pep AI and Peptide Tracker show half-life information, but neither produces a serum-level forecast fitted to your bloodwork. See how the forecasting works →
Hormone therapy, not just peptides
If you run TRT, HRT, or anabolics alongside peptides or GLP-1s, OptiPin is the only one of the three with dedicated testosterone, estradiol, and DHT modeling and reference ranges — all compound families in one place. Pep AI and Peptide Tracker are peptide- and GLP-1-focused.
Built for more than English
OptiPin ships in English, German, Spanish, and Portuguese in-app; both competitors are English-only.
Who should choose which
Want the widest lifestyle-tracking net or need Android? Pep AI. Want a cheap, private, blend-focused peptide log on Apple devices? Peptide Tracker & Calculator. Running hormones too, and want to see your forecasted levels and track everything in one place? OptiPin. All three are free to try — the honest move is to trial the one whose focus matches your protocol.
Forecast your levels, not just your doses
14-day full trial, no account, all on-device. Peptides, GLP-1s, TRT, and anabolics in one app.
Download on the App Store