Built for people who measure everything.
Spreadsheets, janky calculators, and apps that sell your data — that's what this replaces. Five tabs, one job: keep your protocol precise.
Draw to the exact unit mark.
No more guessing with syringes and calculators. Pick your peptide, enter your BAC water and target dose, and PepStak answers the only question that matters: "Measure to the 80-unit mark" — drawn on a U-100 syringe so you can see exactly where to pull the plunger.
The full breakdown shows concentration, mcg per unit, volume to inject, and how many doses are left in the vial.
Run your whole stack at once.
Multiple concurrent stacks, each with its own cycle progress, per-peptide schedules, and adherence rings. The home screen shows what's due today across everything you're running — and logging is one tap.
Weekly schedules with reminders keep every compound on time, whether it's daily Ipamorelin or Monday-only Retatrutide.
Know what's still active.
Every dose decays. PepStak models it — decay curves built from published half-life data estimate what's still circulating from every compound you've logged, with peak and trough at a glance.
Isolate any peptide's curve, scrub across 24-hour to 90-day windows, and see exactly how doses overlap. Modeled estimates for insight — not medical advice.
Rotate sites like a pro.
The body map remembers every injection and color-codes each site's recovery — needs rest, caution, ready soon, good to go. Front and back, tracked automatically.
Pick a site that was used too recently and PepStak warns you — and tells you which one is ready instead. No more tissue buildup from favoring the same spot.
Watch the trend bend.
Weight and body fat percentage on one chart, from one week to all time — with total change and weekly-average rate so you know if the protocol is actually working.
Daily check-ins across six metrics feed Smart Insights that surface patterns automatically: loss rate, logging consistency, protocol adherence.
Visual proof it's working.
Numbers tell part of the story — photos tell the rest. Compare side-by-side across weeks and months to see changes the mirror hides.
Every photo stays on your device, backed up via your own iCloud. Your images never touch our servers — complete privacy for your most personal data.
