On this page
The short version
Pep AI’s App Store listing describes a GLP-1 and peptide tracker with food and macro logging, sleep, mood, progress photos, an Apple Watch app, community groups, and an in-app companion called Arlo, and it states that “a paid subscription is required to access Pep AI’s tracking features.”1 Kairo’s free plan covers the everyday log for your main medication plus two more compounds, with no account. Pro adds unlimited compounds and deeper tools.
Side by side
| As of October 3, 2026 | Kairo | Pep AI |
|---|---|---|
| Tracking without paying | Yes: dose logging and reminders for your main medication plus two more compounds, full history, weight trend, side effects | “A paid subscription is required to access Pep AI’s tracking features”1 |
| Where records live | On your iPhone; no account | “stored securely and synced to your account”1 |
| GLP-1s and peptides | Yes, with published half-life data for 60+ compounds | Yes1 |
| Medication levels | Estimated curve; free for your first 14 days, then your current dose cycle; full history and projection with Pro | “estimated medication levels and timing”1 |
| Food and macros | Not tracked | Calories, protein, carbs, fat, and fiber, including photo meal scans1 |
| Widgets and Live Activities | Read-only next-dose widget free; widget logging and Live Activity with Pro | Home Screen widgets and Live Activities1 |
| AI | Kairo Intelligence, with an active Pro subscription or trial | Arlo, for general educational questions1 |
| Reports | Clinician PDF report with Pro; CSV export free | PDF reports1 |
| Paid plan, U.S. App Store | Kairo Pro: $29.99/year or $5.99/month | In-app purchases listed include yearly plans from $29.99 to $49.99, a $9.99 monthly plan, and a $3.99 weekly plan1 |
Features and prices change. Check each app’s current listing before you decide.
Where Kairo is different
Free tracking, no account
Download Kairo and start logging. There’s no account to create, your records stay on your iPhone, and the everyday log is free. Your dose history is never locked, even if you stop paying for Pro.
Built-in pharmacokinetics and a calculator
Published half-life data for 60+ compounds powers the estimated curve; for anything else you can enter your own estimate. The reconstitution calculator does arithmetic on the numbers you enter, with a visual syringe; it doesn’t suggest a dose.
Stacks, cycles, and labs
Run compounds side by side with schedules like 5 days on and 2 off and planned off days, and log lab markers over time next to your protocol.
A sourced compound library
104 compound guides cite their sources and label human, animal, and lab evidence separately. Kairo identifies compounds; it doesn’t recommend them.
Where Pep AI may suit you better
- You want food and macro tracking. Pep AI logs calories and macros, with photo meal scans.1 Kairo doesn’t log food.
- You wear an Apple Watch. Pep AI lists an Apple Watch app.1
- You want community. Its listing describes community groups for sharing progress.1
- You’re on an older iPhone. Pep AI supports iOS 16.4 or later;1 Kairo needs iOS 18.
Moving to Kairo
Kairo imports CSV files from other trackers and spreadsheets. You review the columns before saving, original dates are kept, and you can undo the import. Importing is free. See the CSV import guide.
Sources
- Pep AI: GLP-1 Peptide Tracker on the U.S. App Store: description, compatibility, and in-app purchases. Checked October 3, 2026.
- Kairo features and prices: Kairo Free vs Pro and Kairo on the App Store.
Pep AI is a trademark of its owner. Kairo and Opportune Labs are not affiliated with, endorsed by, or sponsored by Pep AI. This comparison uses Pep AI’s public App Store listing; corrections are welcome at support@opportunelabs.app.
Educational information, not medical advice. If something feels urgent or wrong, contact your clinician or emergency services.