Your weekly shot, kept steady.

Ostin tracks your GLP-1 shots and dose steps, reminds you until the shot is logged, and keeps protein, weight and side effects in one calm place.

Coming soon to the App Store

For iPhone. Works with tirzepatide, semaglutide, pens, vials and microdosing.

Everything a shot week needs

Built for the moments that matter: “it's shot day — what dose, which site?” and “log protein after a meal”.

Next shot at a glance

Dose and site for today, with your plan's step-ups computed from the shots you've actually taken. Missed and late doses handled.

Reminders until it's logged

Repeats on shot day and gets out of the way the moment you log. Log straight from the notification.

Units or mg

Compounded vial prescribed in units? Ostin shows “10 units” first and mg underneath, and handles microdosing schedules.

Site rotation

Suggests the site you used longest ago, from only the sites you use.

Protein in one tap

Quick-add buttons, plus protein you log in apps like MyFitnessPal counted automatically through Apple Health.

Weight, side effects, appetite

Weight from Apple Health with dose changes marked, side effects and a 10-second evening appetite check-in.

Care team and appointments

Your doctor and pharmacy one tap away, questions saved for the next appointment, and reminders before it.

Private by design

No account. Your data stays on your devices and your private iCloud. Backup and export any time.

A look inside

Everything here is free. Tap any screen to see it full size.

Today screen — **Shot day at a glance**
Dose, site and plan step, with protein and appetite below.

Log Shot screen with dose and site picker — **Log a shot in two taps**
Dose in units or mg, and the site you used longest ago.

Shots screen with plan and care — **Your plan and care team**
Schedule, doctor, pharmacy and appointments together.

Protein screen with history chart — **Protein in one tap**
Quick-add, plus apps like MyFitnessPal through Apple Health.

Progress screen with weight goal and milestones — **Weight and goal**
Milestones, and dose changes marked on your weight chart.

Appointments screen — **Appointments**
Questions saved for your doctor, with reminders before.

Today screen in dark mode — **Light and dark**
Follows your iPhone, or pick one.

Ostin Plus

$9.99 once

No subscription. Family Sharing included, so one purchase covers your household.

Everything in Plus

Doctor report — a detailed PDF of your plan, adherence, weight, side effects and questions. Email it, text it or print it.
Estimated medication level — how your medication builds and fades between shots, next to your appetite.
Shot on your Lock Screen — dose and site from reminder time until you log it.
Refill forecasts — know when your pens or vial run out or expire, in time to refill.
Patterns — side effects and appetite by day after your shot and by dose.
Highlight color — Ocean, Plum, Rose, Slate or Amber instead of Forest.
App icons — choose Cream, Amber or Night.

Everything you need day to day is free: logging, your schedule, every shot reminder, site rotation, protein, weight, side effects, appointments, and backup and export.

See it

First page of the doctor report PDF — **Doctor report**
A detailed PDF to email, text or print · sample

Estimated level chart with appetite — **Estimated medication level**
How it builds and fades between shots, next to your appetite.

Patterns screen — **Patterns**
Side effects and appetite by day after your shot and by dose.

Supply with expiry and refill warning — **Refill forecasts**
When your vial or pens run out or expire, with a call-the-pharmacy button.

Today screen in the Plum highlight color — **Highlight color**
Ocean, Plum, Rose, Slate or Amber instead of Forest.

App icon choices — **App icons**
Forest, Cream, Amber or Night.

Ostin records and follows the plan your prescriber gives you. It doesn't recommend doses or replace medical advice; check with your doctor before changing your treatment. Ostin isn't affiliated with any medication manufacturer.