100% Offline No Account Required Free to Download

A better way to manage your supplement routine

Build your daily stack, check off each supplement by time of day, and build streaks that keep you consistent. Simple, private, effective.

Download on the App Store

iPhone only · iOS 17+ · All data stays on your device

💊 StackDay Today
🔥 14-day streak
Morning
✓
Vitamin D3
5,000 IU
✓
Magnesium
400 mg
Omega-3
1,000 mg
Evening
Zinc
25 mg
Ashwagandha
600 mg
14
Day Streak
87%
Adherence
2/5
Today
100%
Private — data never leaves your iPhone
3
Times of day — morning, afternoon, evening
∞
Supplements with Pro — no limits, no caps
Features

Everything you need.
Nothing you don't.

StackDay is focused on one thing: helping you stay consistent with your supplement routine. Four tools, zero complexity.

Daily Checklist

Your stack,
organized by time of day

Every supplement is assigned a time slot — morning, afternoon, or evening. Your daily view groups them so you always know exactly what to take and when.

  • Check off each supplement as you take it
  • Grouped by morning, afternoon, and evening
  • Resets cleanly every day at midnight
  • Never wonder if you already took something
✓
Vitamin D3 · 5,000 IU AM
✓
Magnesium · 400 mg AM
Omega-3 · 1,000 mg AM
Zinc · 25 mg PM
Ashwagandha · 600 mg PM
Streak Tracking

Build momentum.
Keep it alive.

Your streak counts consecutive days where you completed your full supplement checklist. Miss a day and it resets — but your longest streak is always saved so you can try to beat it.

  • Current streak and longest streak at a glance
  • Resets on missed days to keep streaks honest
  • Weekly calendar view to spot patterns
  • One of the strongest motivators to stay consistent
Current Streak
🔥 14
consecutive days
M
T
W
T
F
S
S
14
Current
21
Best
87%
30-day rate
Smart Stats

See exactly how consistent you've been

Analyze your supplement habits over time. See adherence rates, per-supplement completion, and trends across 7, 30, or 90 days. Know which supplements you actually take.

  • Overall adherence rate across any time range
  • Per-supplement completion breakdown
  • 7-day, 30-day, and 90-day views
  • Spot which supplements you're skipping most
87%
30-day adherence
14
Day streak
5
Supplements tracked
21
Longest streak
Top supplement this month
Vitamin D3 97%
Magnesium 90%
Ashwagandha 71%
Private by Design

Your health data stays on your phone

StackDay stores everything locally using SwiftData. Nothing is uploaded, synced, or shared. No account required, no servers, no data brokers. Your supplement history is yours.

  • All data stored locally on your iPhone
  • Works completely offline, all the time
  • No account, no sign-up, no email required
  • Delete the app and everything is gone
🔒 All data stored locally — never uploaded
📵 Works 100% offline, no internet needed
🙈 No account, no sign-up, no email
🗑️ Delete the app = all data gone, permanently
🚫 No data brokers, no advertising IDs sold
What People Are Saying

Loved by supplement trackers

★★★★★

"Finally a supplement app that doesn't require an account or try to sell me products. Just tracks what I take, builds my streak, and gets out of the way."

— Jordan M., iOS · Morning stack user
★★★★★

"The time-of-day grouping is exactly what I needed. I take different things morning and evening and this keeps it perfectly organized."

— Casey R., iOS · 5 supplements daily
★★★★★

"Simple and effective. I was tracking in my Notes app before — this is so much better. The streak counter is genuinely motivating."

— Alex P., iOS · 22-day streak
★★★★★

"I love that it's completely private. My health data isn't going anywhere — it's all on my phone. Clean design, does exactly what it says."

— Sam L., iOS · Privacy-first user
Built Different

Trusted, private, and backed by simplicity

🔐

Your data, your device

StackDay uses Apple's SwiftData framework. Everything stays on-device. No servers, no syncing, no cloud. Your supplement history is physically on your iPhone.

🏥

Not medical advice

StackDay is a tracking tool to help you stay consistent — not a medical device. Always consult a healthcare professional before starting any supplement regimen.

🍃

Made by Foggy Labs

A small independent iOS studio focused on building focused, quality apps. No venture capital, no growth-hacking — just good software that does one thing well.

Pricing

Simple, honest pricing

Free

$0

No credit card, forever free

  • ✓ Basic supplement tracking
  • ✓ Daily checklist
  • ✓ Streak tracking
  • ✓ Limited supplements
Get Started Free
Best Value

Pro Annual

$14.99/yr
Save 37% vs monthly
  • ✓ Unlimited supplements
  • ✓ Full stats & analytics
  • ✓ All premium features
  • ✓ All future updates
Download Free

Pro Monthly

$1.99/mo

Cancel anytime in Settings

  • ✓ Unlimited supplements
  • ✓ Full stats & analytics
  • ✓ All premium features
  • ✓ All future updates
Download Free

Subscriptions auto-renew. Cancel anytime in iPhone Settings → Subscriptions → StackDay.

FAQ

Frequently asked questions

How do I add a supplement? +
Tap the add button on the main screen, enter the supplement name, choose the time of day (morning, afternoon, or evening), and save. It will appear in your daily checklist immediately.
How do streaks work? +
Your streak counts consecutive days where you checked off every scheduled supplement. Miss a day and the streak resets — but your longest streak is always saved so you can try to beat your record.
Can I track supplements by time of day? +
Yes. Every supplement is assigned to a time slot — morning, afternoon, or evening. Your daily checklist groups them by time so you always know what to take and when.
Is my data private? +
Completely. StackDay stores all data locally on your device using SwiftData. Nothing is uploaded to any server, and no account is required. Your supplement data never leaves your iPhone.
How do I cancel my subscription? +
Go to iPhone Settings → [Your Name] → Subscriptions → StackDay. You can cancel anytime and keep access until the end of your billing period.
Does the app work without internet? +
Yes, completely. StackDay is 100% offline. All your data is stored on your device and the app never needs an internet connection to work. No network required, ever.

Start building your streak today

Free to download. No account. No setup. Just open the app and add your first supplement.

Download on the App Store

Available on iPhone · Requires iOS 17+ · Free with optional Pro upgrade

These statements have not been evaluated by the Food and Drug Administration. StackDay is not intended to diagnose, treat, cure, or prevent any disease. Always consult a healthcare professional before starting any supplement regimen.