The calculator you just used, in your pocket

The website does the math once. The app remembers it: every vial, every dose, and when to reorder, with simple level charts. Made for people who take their protocol seriously.

10k+

Downloads

4.9

App Store Rating

Free trial

Most features free

Stackr Today view with one-tap dose logging

Reconstitute and save

Run the same math you just did on the web, then keep every vial's concentration on file.

Doses remaining, live

Each logged dose deducts from the right vial so you always know what is left.

Reorder before you run out

Reminders fire ahead of time, not the morning of your next dose.

Levels and history

Per-peptide level charts from your real dose history, built on half-life modeling.

Free on the App Store