Peptides68+ profiles
Every receptor pathway. Every dose.
Explore WikiFrom · Live Market
Compare peptide prices from 130+ shops.
Automatically updated. EU + USA. Independently reviewed.
Updated weeklyEU + USAVendor-verified pricing
The Atlas
68 Peptides. 3250 Studies. One Wiki.
Evidence-based profiles with half-life data, mechanisms, peer-reviewed studies, and clinical trials.
Hormone Wiki50+ Hormones
Endocrine systems, mapped.
TamoxifenHormone ManagementLuteinizing HormonePituitary & Trophic HormonesEstradiolSex Hormones & TRTProgesteroneSex Hormones & TRT
Browse HormonesBiomarker Wiki115+ Biomarkers
Reference ranges that mean something.
Browse BiomarkersThe most searched compounds and markers.
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Free Tools
Try Our Free Peptide Tools
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
For Vendors
Running a peptide shop?
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137+ Shops · 3127+ Prices · Updated weekly
For coaches
You coach athletes? PepStack is for you, too.
Cycle plans, blood marker targets, and client notes — end-to-end encrypted.
- Verschlüsselte Pläne
- Klient-bestätigt
- Audit-Log
Roadmap
What's Next
We're just getting started.
Coming Q3 2026
Coach Mode
Create cycles for clients. Share via QR code. Manage all clients in one dashboard.
Coming Soon
Research Newsletter
Weekly digest: New studies, new peptides, price changes — straight to your inbox.
Coming Soon
Bloodwork Tracking
Track your blood markers over time. See how your values change during a cycle.
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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.
Serial Founder & CEOCompetitive Athlete & Biohacker10,000+ Students
“I don't just build this product — I use it every single day.”