Comparison

StackFlow vs StackDay

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

StackFlow

This app helps you manage complex supplement routines by scanning labels, providing AI-driven timing suggestions based on ingredient interactions, and tracking your body's response. It visualizes synergy and spacing for optimal intake.

Highlights
  • AI-powered supplement timing
  • Supplement label scanning
  • Ingredient-level intelligence
  • Synergy and spacing visualization
  • Daily routine tracking
  • Body response logging
  • Daily insights feed
Features
Read full description

Taking multiple supplements every day? The hard part is not remembering them — it is knowing what goes together, what needs spacing, and when each one works best. StackFlow turns supplement chaos into a clear, executable daily system. BUILT ON 200K+ REAL SUPPLEMENT PRODUCTS Search or scan real products with real ingredients, real serving sizes, and real label facts — not a generic vitamin list. INGREDIENT-LEVEL INTELLIGENCE StackFlow maps each product to its actual ingredients, so you understand what you are really taking — not just the brand name on the bottle. SCAN A LABEL, ADD IN SECONDS Point your camera at any supplement label. StackFlow reads the product, maps the ingredients, and places it into your routine. AI TIMING PLANS THAT EXPLAIN WHY Get timing suggestions based on ingredient interactions, absorption rules, and your current stack. Every recommendation shows the reasoning behind it. SYNERGY AND SPACING, MADE VISIBLE See which supplements work better together, which ones need to be spaced apart, and why your routine is organized the way it is. YOUR DAILY COMMAND CENTER Open StackFlow each morning. See exactly what to take now, check off each time slot, and keep your routine moving without guesswork. TRACK HOW YOUR BODY RESPONDS Log energy, sleep, digestion, and other signals. Over time, connect your routine to what you actually notice. DAILY INSIGHTS FEED (PRO) Receive a curated daily digest based on your stack, check-ins, and patterns — not a generic health tip, but intelligence about your specific routine. StackFlow is built for people who take supplement routines seriously. It is not medical advice, diagnosis, or treatment. Privacy Policy: https://www.stackflow.life/privacy.html Terms of Use (EULA): https://www.stackflow.life/terms.html

About

StackDay

This app helps you consistently take your vitamins and supplements. Log doses, build streaks, and view your adherence over time. It offers smart reminders and pre-loaded supplement information to make tracking easy.

Highlights
  • Daily checklist for all supplements
  • 50+ pre-loaded supplements
  • Streak and adherence statistics
  • Customizable smart reminders
  • Local data storage for privacy
  • Home screen widget (Pro)
Features
Read full description

Keep your supplements and peptide doses organized in one daily schedule. Log what you take, get reminders, and review your adherence, weight and wellness over time. YOUR DAY, TOGETHER See supplements and scheduled peptide doses in Today. Build a routine around your wake-up, meals and bedtime, then check off each dose as you take it. A RECORD YOU CAN REVIEW Explore dose history, adherence calendars and progress views. Record weight and wellness check-ins alongside your regimen to spot patterns. Patterns and correlations do not establish cause and effect. PEPTIDE TRACKING Keep records of your protocols, vial use and injection sites. Review past site usage to help plan rotation. Any estimated compound-level chart is illustrative and is not a measured blood level or a guide to when to take a dose. Follow your clinician's instructions. BUILD AND MAINTAIN YOUR STACK Find supplements in the library, add your own items, manage inventory and review supported timing checks. Checks are informational, are not exhaustive and do not establish that a combination is safe. REMINDERS AND WIDGETS Use reminders and supported Home Screen or Lock Screen widgets to keep your routine visible. Reminder timing follows the schedules you enter. BACKUP AND RESTORE Create a full backup in Files and restore your saved regimen and history when needed. Keep backups somewhere safe before replacing or deleting your app. OPTIONAL ONLINE TOOLS Label scanning and the AI Supplement Advisor use online processing. Relevant input is sent to service providers when you use these features. Core tracking records are stored on your device; analytics and subscription services also process data as explained in the Privacy Policy. SUBSCRIPTION ACCESS New users need a StackDay Pro subscription to continue after setup. Available plans, prices and any eligible free trial are shown before purchase. Subscriptions renew automatically unless canceled through your Apple account. Existing users may retain legacy access. MEDICAL DISCLAIMER StackDay is for personal organization and tracking. It does not provide medical advice, diagnose conditions, prescribe treatment or determine safe doses. Verify any calculations independently and consult your healthcare provider before changing a medication, supplement or peptide regimen. Privacy Policy: https://foggy-labs.github.io/privacy/stackday Terms of Use: https://foggy-labs.github.io/terms/stackday Support: https://foggy-labs.github.io/support/stackday

Screenshots

StackFlow4 screens
StackDay4 screens

Verdict

The call

The clearest difference is ads: StackFlow at none against StackDay's shown. StackDay's advantage is update cadence (every 4 days vs every 2 weeks) and ratings volume (5 vs 1). On price, rating, review sentiment and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. StackFlow sells 2 in-app purchases, starting at $4.99 per month and StackDay sells 8 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for StackFlow against 5.0 for StackDay. That said, the two scores are not equally well evidenced: StackDay has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

StackFlow ships an update every 2 weeks, StackDay every 4 days. The most recent releases landed on October 19, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 7 level
StackFlow versus StackDay: the parameters behind the verdict, then further details
ParameterStackFlowStackDay
PriceFreeFree
Rating5.0 (1 ratings)5.0 (5 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings15 — better
Update frequencyEvery 2 weeksEvery 4 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad — betteriPhone
Requires iOS17.617.0 — better
Further details — not scored
Size5 MB24 MB
Age rating4+17+
Developer航东 郭Fog Hill, LLC

Customer experience

StackFlow

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

StackDay

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

StackFlow

Subscriptions2
  • StackFlow Pro Monthly1 Month trial$4.991 Month
  • StackFlow Pro Annual$29.991 Year
8 purchases

StackDay

Subscriptions8
  • Pro Weekly Discount3 Days trial$0.997 Days
  • Pro Weekly$1.997 Days
  • Pro Monthly Discount$3.991 Month
Show 5 more
  • StackDay Pro Monthly$4.991 Month
  • StackDay Pro Monthly Subscription3 Days trial$4.991 Month
  • Pro Annual Discount$19.991 Year
  • StackDay Pro Annual Subscription3 Days trial$24.991 Year
  • StackDay Pro Annual7 Days trial$49.991 Year

Questions

Is StackFlow free?
StackFlow is free to download, with in-app purchases available.
Is StackDay free?
StackDay is free to download, with in-app purchases available.
Which has better reviews, StackFlow or StackDay?
StackFlow and StackDay are both rated 5.0 out of 5 on the App Store, from 1 and 5 ratings respectively.
Do StackFlow or StackDay have ads?
StackDay shows ads; StackFlow does not.
Which is updated more often, StackFlow or StackDay?
StackFlow ships an update every 2 weeks, and StackDay every 4 days. Most recently, StackFlow was updated on October 19, 2026 and StackDay on October 31, 2026.

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