Stacky

Your stack, finally under control.

Build a stack. Know when to take it. Understand what's inside. Share it. One honest companion for everything you take.

Join the beta on TestFlight
Beta live on iPhone Verified interaction data Evidence-graded substances
01 · Stack

Every bottle, tracked to the last day.

Your library knows what's running low before you do. Each product carries its dose, its schedule, and exactly how many days are left — sorted by what needs you first.

02 · Overview

See how your stack works together.

Verified interactions only — synergies in green, clashes in red, and one concrete move to make today. No guesses, no filler: the map is deliberately limited to what's well established.

03 · Passport

Your consistency, made into a keepsake.

Streaks, lifetime doses and loyalty — pressed into a gold passport you can share. Earned one logged day at a time.

Stacky Stack Passport
Alex
Member since December 2025
23
day streak
Longest 41 days
412
doses logged
14
in your stack
187
days in
Most loyal to
Creatine Monohydrate96%
Magnesium Glycinate88%
Omega-3 Fish Oil74%
Track yours at stacky-app.com
First step Added your first substance
Committed A month in the making
Centurion One hundred days deep
04 · Ask

An advisor that knows your stack.

Observational insights in plain language. It flags what's worth reviewing — timing clashes, doubled-up labels, well-matched pairings — and never plays doctor.

05 · Explore
MG
Magnesium Glycinate
Minerals
128 people taking this
Goals
Sleep Recovery
Dosage
200–400 mg
Evidence Grade
A
Strong evidence
A
B
C
D
Backed by 14 studies · How grading works →
META 2021 · Journal of Clinical Sleep Medicine
The effect of magnesium supplementation on primary insomnia in elderly: a double-blind placebo-controlled clinical trial
RCT 2017 · Nutrients
Magnesium supplementation and indicators of sleep quality in adults: a randomized controlled trial

Backed by receipts.

Every substance is graded A to D on the strength of the human research behind it — over 930 studies cited across the catalog, each one a tap from PubMed. And when you've built something worth copying, share it: browse stacks and people, follow, and borrow what works.

#1Most saved
9
Essential Foundations
by Sara Chen Sara Chen
Minerals · Vitamins · Fatty Acids
My daily baseline — magnesium, omega-3 and vitamin D3 for sleep and recovery.
6 products 9 substances 1.2k saves
Most followedJoin them →
1 James Walker
James Walker
Sleep Focus
234
2 Sara Chen
Sara Chen
Recovery
198
3 Emma Hayes
Emma Hayes
Longevity
154

And everything else

06 · And everything else

Scan the label

Point the camera at a barcode and the product fills itself in.

A catalog with receipts

200 substances and 300+ products — categorized, searchable, growing weekly.

930+

studies cited across the catalog

Mood, logged in a tap

Five faces a day. Patterns show up where you least expect them.

Dose ranges, checked

Your daily amount of each substance, set against its reference range.

Magnesium · 400 mgWithin range

Know what it costs

€42.80 a month, €1.43 a day — and exactly which product is the expensive one.

Reminders that group up

One nudge per time block — not one per pill.

Private by default

Your stack is yours. Export everything or erase your account — anytime, in one tap.

Frequently asked questions

07 · Questions
When does Stacky launch?
The beta is live on iPhone right now — you can join it through TestFlight today. The waitlist gets you first in line for the full App Store release.
Is Stacky medical advice?
No. Stacky is informational: it organizes your routine, grades the evidence behind substances, and flags things that may be worth reviewing. It never prescribes doses or replaces a healthcare professional.
Where does the interaction data come from?
From a deliberately limited, verified set of well-established interactions, checked against reputable sources. The map grows only as new entries pass the same bar — we'd rather show you less than guess.
How do evidence grades work?
Every substance is graded A to D on the strength of the human research behind it — study type, size and consistency, drawn from the 930+ studies cited across the catalog. Each study is linked, one tap from PubMed, so you can read the receipts yourself.
Is my data private?
Yes. Your stack is private by default — sharing is always opt-in. You can export everything you've logged, or permanently erase your account and data, at any time.
What about Android?
iPhone comes first. If you're on Android, join the waitlist and the Discord and tell us — demand decides what we build next.

Built one honest day at a time.

Join the waitlist and be first in line for the full release.

Or jump straight into the beta on TestFlight →