Compare peptide prices from 130+ shops.
Automatically updated. EU + USA. Independently reviewed.
68 Peptides. 3058 Studies. One Wiki.
Evidence-based profiles with half-life data, mechanisms, peer-reviewed studies, and clinical trials.
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The most searched compounds and markers.
Free Tools
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Calculate reconstitution volumes and visualize serum levels — right in your browser, no sign-up required.
Reconstitution Calculator
Enter your vial content, BAC water volume, and target dose to get the exact draw-up volume.
Serum Level Visualizer
See how your serum levels build up over time based on dose, injection interval, and half-life.
iOS & Android
Track your cycles. Never miss a dose.
The most comprehensive biohacking tracker for peptides, supplements, and TRT.
- Cycle Tracker — Peptides, Supplements, TRT
- Smart Reminders — Morning, Noon, Evening
- Serum Level Curves — Live pharmacokinetics
- Peptide Wiki — 67 peptides, available offline
- Share & Import — Share stacks via QR code
- Cloud Backup — Encrypted, cross-device
Coming soon: Bloodwork Tracking · Coach Mode · Inventory

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125+ Shops · 5957+ Prices · Updated weekly
What's Next
We're just getting started.
Coach Mode
Create cycles for clients. Share via QR code. Manage all clients in one dashboard.
Coming Q3 2026Research Newsletter
Weekly digest: New studies, new peptides, price changes — straight to your inbox.
Coming SoonBloodwork Tracking
Track your blood markers over time. See how your values change during a cycle.
Coming Soon
Meet the Founder
Built by a Biohacker, for Biohackers.
I'm Max — a serial founder from Bamberg, Germany, and CEO of OpenSphere Software. With my company, I help businesses in the fintech and banking space in Germany build digital products. I've trained 10,000+ developers on Udemy and shipped multiple startups. PepStack is a passion project — as a dedicated competitive athlete and biohacker, I needed a real tool to track peptide cycles, bloodwork, and hormones. Nothing out there was good enough, so I made one.
“I don't just build this product — I use it every single day.”