Your whole stack,
in one place.
Every vitamin, capsule, peptide and shot — one quiet logbook that remembers each dose, each refill, and the levels still working in you between them. No ads. Your health data never leaves your device.
Launching soon on Android — drop your email and we'll tell you the day it's live.
Better than how you track it now.
You don't need another app to beat — just the notes, the spreadsheet, and the memory you're using today.
Whatever's in your stack, it's already here.
From a daily multivitamin to a weekly shot — 112 compounds and counting, each with a plain-English, cited page.
Watch it build in your system.
A logbook tells you what you took. Stack also models what's still working — a relative-level curve drawn from each compound's half-life, so overlapping doses stop being a guess.
Testosterone · relative level
Each injection adds to what hasn't cleared yet. The thread is the sum — the steady state you're actually holding.
A profile that earns its keep
The more Stack knows, the sharper the picture. The gold fills as you complete it — nothing here is required.
Everything your stack needs
Built for the way real protocols work — multiple compounds, different schedules, vials and titrations.
Smart reminders
Exact-time, time-block or every-N-days. One combined ping when doses land together.
Supply projection
"≈ 10 doses left · refill Jul 3." See run-out before it happens, with cost per dose.
In your system
A relative-level curve modeled from each compound's half-life — see doses overlap.
Injection rotation
A body-map remembers where you pinned and recommends the next site.
Reconstitution calc
Vial mg + water mL → exact syringe units. Try it on the web →
Scan a label
Point your camera at a vial — Stack reads the strength and size on-device.
Bloodwork & weight
Labs, weight, body comp and lifts in the same place as your doses — trends line up.
Private by design
Encrypted on your device. Sign-in is email-only — it never sees what you take. No ads; only anonymous, aggregate analytics that never include your health data.
It remembers where you pinned.
Mark the sites you use, and Stack keeps an honest rotation going — the map shows what's rested and hands you the next spot, so you're never asking "did I already do the left side?"
Never caught empty.
Every logged dose draws down the vial. Stack counts what's left and tells you the refill date before you run dry.
What Stack is. What it isn't.
We'd rather tell you the edges up front.
- A private logbook for everything you take
- An educational reference, cited to the literature
- A calculator, a schedule, a report for your doctor
- Medical advice, a diagnosis, or a recommendation
- A prescription or an endorsement of any compound
- A measurement — curves are modeled estimates
Encrypted on your device. Cloud backup is opt-in — off by default. Email-only sign-in, so your account never sees what you track. Export everything as CSV anytime. Delete your account and everything goes with it, permanently. No ads, ever. We never sell your data, and never train on it.
Your whole stack, at a glance
Ink on paper, fast and quiet — here's what tracking actually looks like.
Tap any screen to enlarge.
Free tracks the habit.
Plus reads the insight.
The whole logbook is free, with no cap on compounds. Plus is for when you want to see why — the levels, the labs, the long trends.
Free
The full logbook. Yours to keep.
- Track every compound — no caps
- Smart reminders & supply projection
- Streaks, milestones & injection rotation
- Weight trend & label scanning
- 3 questions a day for Sage
Plus
Billed monthly. Cancel anytime.$49.99/year — about $0.14 a day. Or $124.99 once for Lifetime.
- Everything in Free
- In-system levels — the half-life curves
- Bloodwork ranges & the full trend history
- Unlimited Sage & a doctor-ready report
- Automatic encrypted cloud backup
Buy Plus on the web — the same account signs you in on the app.
Never a paywall on your own data. Export an encrypted backup any time, on any plan.
Know what you take.
Plain-English pages for 112 compounds — what each one is, how it works, half-life, storage and what matters when you track it. Summarized from public sources, cited, and free to read. Every page opens straight into tracking it in the app.
Browse the library Read the guidesQuick answers
Is Stack free?
Yes. Tracking, reminders, supply projection, streaks and weight trends are free — with no cap on how many compounds you track. Plus ($9.99/mo or $49.99/year) adds the insight layer: in-system level curves, bloodwork ranges, your full trend history, cloud backup and unlimited Sage. Or get Lifetime once ($124.99) and keep it all forever.
Do I need an account?
You sign in with just your email — no password — so your Plus and settings follow you across devices. But the account only ever knows your email, never what you take: your health data stays encrypted on your device, and cloud backup is opt-in. You can always export an encrypted backup file you own.
What can I track?
Anything you take on a schedule: supplements, vitamins, medications, peptides, GLP-1s and TRT — plus habits, weight, lifts and bloodwork alongside your doses.
Does Stack give dosing advice?
No. Stack is a logging tool and an educational reference. It never recommends compounds or doses, and nothing in the app or on this site is medical advice.
When does it launch?
Android first, very soon — iOS after. Email us and we'll tell you the moment it's live.
Your protocol deserves
a better logbook.
Free to track. Private by default. Built for stacks, not single pills.
Tell us what to build next
Bugs, ideas, love notes — we read every message and reply.