About Agonist
What is Agonist?
A tracking tool for people who use peptides. Reconstitution calculator, daily dose dashboard, citation-backed library, injection-site map, stacking safety checker, biomarker correlation. Available on iOS and web.
Who is it for?
Anyone reconstituting their own peptide vials — biohackers, lifters, GLP-1 patients, longevity-curious adults. You're 18+ and you know what you're doing. We trust you to make your own decisions.
Is this medical advice?
No. Agonist is a record-keeping and calculation tool. It does not diagnose, treat, prescribe, or recommend dosing. Always consult a qualified healthcare provider before starting any peptide protocol.
What's different from Pep AI / Vial / PepCalc?
We don't show floating capsules in our marketing (peptides aren't pills). We don't default to purple. Our peptide library cites peer-reviewed sources. Our calculator remembers the vial. Our dashboard is one screen, not five. The stacking safety checker is something no competitor has.
The math
How accurate is the calculator?
Exact. The math runs on the same shared TypeScript package as the iOS app — no rounding shortcuts. We round to the nearest tick on the selected syringe only when displaying, and we tell you when the rounded value isn't exact.
What syringes does it support?
U-100 insulin syringes in 0.3 mL (30u), 0.5 mL (50u), and 1.0 mL (100u). We recommend the smallest barrel that fits your dose — finer ticks, better precision.
Why micrograms instead of milligrams?
Most peptide doses are sub-1 mg. Working in mcg avoids decimals like 0.25 mg = '250 mcg.' For peptides typically dosed above 1 mg (Sema, Tirz), the display switches to mg automatically. You can override per peptide.
What's BAC water?
Bacteriostatic water — sterile water with 0.9% benzyl alcohol added to inhibit microbial growth. It's what most peptides are reconstituted with for multi-use vials.
Privacy & data
Who can see my data?
Only you. Encrypted at rest. Optional biometric lock. We never sell data. We never share with insurance or employers. You can export everything (PDF + JSON) or delete your account at any time.
Do you train AI on my data?
No. Your protocols, doses, journal entries, and labs are never used to train models. The Coach tier uses Claude API for personalized advice, but those API calls run without contributing to training.
Apple Health integration — is that safe?
Yes. HealthKit data stays on-device by default. Cloud sync is an explicit opt-in. We never write back to HealthKit unless you turn that on.
Practical questions
When does it launch?
Early access starts with Early access cohorts in summer 2026. Get on the waitlist to be notified. Web app stays free in beta for waitlist members.
Will it work on Android?
iOS first, web second. Android is on the roadmap but not for Phase 1. The web app works on Android browsers in the meantime.
Can I import data from another tracker?
Yes — CSV import for dose history. PDF parsing for Quest / LabCorp lab results. Spreadsheet import for legacy users coming from Google Sheets.
What if a peptide I use isn't in the library?
You can create a custom peptide entry with your own data. The library covers 30 of the most-used research peptides at launch — Pro adds the ability to add unlimited custom ones.