Pricing
Always free. Go deeper when you're ready.
Stack Precision is free forever: track supplements, peptides, and journal, get a fresh AI insight every week, and start with an allowance of the AI chat. Base ($1.99/mo) folds Apple Health and genetics into the analysis and unlocks research runs. Plus ($4.99/mo) adds more AI use, additional deep dive research runs, and more chat every month.
Always free
$0
Track everything you take
Track your supplements, peptides, and journal, get a fresh AI insight every week, and start with an allowance of the AI chat. Free is permanent, not a trial, and it requires no payment information.
Base
$1.99 /mo
Fold your whole record in
Folds Apple Health and your genetics into the analysis and unlocks research runs. Your measurements and your DNA join the same timeline as everything you take, and you can put a harder question to your own record.
Plus
$4.99 /mo
More chat and more deep dives, every month
More AI use every month and additional deep dive research runs. Everything in Base, with the most headroom for chat, research, and the questions that take real digging.
What free really includes
Free is not a trial
Free is not a teaser that runs out. Track your supplements, peptides, and journal, with a fresh AI insight every week, for as long as you use the app. Paying folds Apple Health and your genetics into the analysis and opens the research runs.
Reassurance
You always know where you stand
Every plan shows you a clear gauge of how much you have used and the date it resets. You get a gentle heads-up before you get close, and if you run out, it slows down gracefully and tells you the day it picks back up. No overage, no surprise charge, no getting cut off without warning.
Grounded search draws down your usage faster than a plain question. More questions? The support FAQ covers billing and plans.
Start free tonight
Log what you take, read your first weekly insight, and upgrade the day you have a question worth a cited answer.
Always free. Billed through the App Store or Google Play.