Built for biohackers who run real protocols. Track compounds, visualize serum levels, manage inventory — encrypted end-to-end.
App tour
Cycle tracking, bloodwork analysis, and an evidence-based wiki — all in one app, end-to-end encrypted.
Dashboard
The cycle calendar shows what's due today at a glance — morning, midday, evening. Multiple parallel cycles, multiple compounds per intake, automatic reminders.
Cycle tracking
Compound amounts, intake groups, start/end dates, timeline and serum-level forecast — all per cycle in one view. Pause, end or adjust anytime.
Bloodwork
Upload your bloodwork. PepStack instantly shows which markers are out of range, with reference intervals for age & sex, clinical significance, and history across multiple panels.
Marker detail
From hemoglobin to free testosterone: reference range, units, history over time and a direct link into the marker wiki. Linked to your cycles so you can see effect & side-effects.
Peptide wiki
Research database with chemical profiles, molecular structures, clinical studies and phases. All sourced from published scientific literature — sortable by citations, filterable by study type.
Marker library
Hormones, vitamins, electrolytes, metabolic markers — all in one searchable wiki. Categorized, with reference ranges right in the listing and an instant jump into the detail.
Wiki detail
Every marker with reference range, units, clinical significance and test recommendation. Linked to your bloodwork and the cycles affecting it.
Ready when you are
Free to start · Premium €2.99/mo
Security
Every protocol, every log, every note — encrypted on your device before it ever leaves. Cloud backups use E2EE so only you hold the key. We can't read your data. Nobody can.
1 · Your device
Your key never leaves the device. Encryption happens locally — before any data is uploaded.
2 · PepStack cloud
PepStack never sees your key. The cloud stores an opaque blob — useless without your device.
AES-256 · Per-device key · Zero-knowledge
Pricing
Core features at no cost. Unlock the full stack for less than a coffee.
Starter
Essential tracking and dosing math — no subscription, no sign-up wall.
No sign-up · No card
Premium
Unlimited cycles, reminders, inventory, advanced serum modeling, and encrypted cloud backups.
Cancel anytime · Billed via App Store / Google Play