Comparison

CircadiaOS vs Qstack Daily Mindset Questions

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

Head to head
About

CircadiaOS

This app learns your body's ideal sleep temperature and automatically adjusts your smart thermostat throughout the night. It uses data from your wearable to personalize a four-phase temperature schedule for optimal sleep recovery. Requires a compatible smart thermostat and sleep-tracking wearable.

Highlights
  • Learns ideal sleep temperature
  • Personalized four-phase temperature schedule
  • Integrates with smart thermostats
  • Syncs with sleep-tracking wearables
  • Analyzes sleep quality
  • Two-week calibration period
Features
Read full description

CircadiaOS adjusts your bedroom temperature through the night, automatically. Your body temperature isn't constant while you sleep. It drops as you fall asleep, stays low through your deepest sleep, and rises again before you wake. A thermostat held at one number all night works against that. CircadiaOS builds a temperature curve for your night and drives your smart thermostat to follow it. Connect a wearable and the curve adapts to your own recorded nights instead of a general model. HOW IT WORKS - Connect your thermostat and your wearable - CircadiaOS builds a curve from your profile on night one - As your nights accumulate, the curve shifts to your own data - See exactly which parts come from your sleep and which are still estimates WHAT YOU SEE - Tonight's schedule, phase by phase - Why each setpoint is what it is - Your best and worst nights, side by side, and what differed Requires a compatible smart thermostat. A wearable is optional but unlocks personalization from your own sleep data. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Qstack Daily Mindset Questions

This app helps you rewire your mind by asking five personalized questions daily across key life areas. It leverages neuroscience and cognitive behavioral therapy to shift your focus and foster lasting identity-based change.

Highlights
  • Personalized daily questions
  • Lock screen notifications
  • Neuroscience-based approach
  • Cognitive Behavioral Therapy principles
  • Identity-based transformation
  • Answer writing for retention
Features
Read full description

Ask better questions. Build a better life. Your brain receives 11 million bits of information every second. It consciously processes 40. The questions you ask yourself daily train the filter that decides which 40 you see. Ask why you always fail and your brain finds evidence of failure everywhere. Ask what is working and it finds that instead. Same world. Different questions. Different life. Every self improvement app you have tried works downstream of this problem. Journaling gives you a blank page. Affirmations tell your brain what to believe. Meditation delivers calm. None of them change the questions running in the background of your mind every single day. Those questions are building your life whether you chose them or not. Qstack delivers five personalized questions to your lock screen every day across faith, mind, body, relationships, and work. Built on the neuroscience of how your brain builds your reality. Backed by cognitive behavioral therapy, the most studied psychological intervention in history with over 2,000 peer reviewed studies. Licensed therapists charge $200 an hour to ask their patients better questions. Qstack puts that same practice on your lock screen every morning. Research confirms structured daily questioning reduces cortisol by up to 23 percent, produces measurable drops in depression scores, and physically rewires identity regions of the brain visible on fMRI scans. Day one a question stops you cold. Day thirty your filter is quietly shifting. Day ninety you are not the same person who downloaded this app. Not because you forced new habits. Because you became someone whose habits follow naturally from who they are now. Identity based change produces 100 times more sustained transformation than task based habits. Writing your answers increases identity retention by up to 50 percent. Your brain is already searching for answers. Qstack decides what it searches for. https://qstackapp.org/terms https://qstackapp.org/privacy

Screenshots

CircadiaOS4 screens
Qstack Daily Mindset Questions4 screens

Verdict

The call

The clearest difference is rating: Qstack Daily Mindset Questions at 5.0 against CircadiaOS's 3.8. Qstack Daily Mindset Questions also leads on ads (none vs shown) and review sentiment (100% vs 75%). CircadiaOS's advantage is update cadence (every 3 days vs every 10 days). On price, ratings volume, in-app purchases and monetization model 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. CircadiaOS sells 4 in-app purchases, starting at $9.99 per month and Qstack Daily Mindset Questions sells 5 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Qstack Daily Mindset Questions holds the better App Store score, 5.0 against 3.8. Both are backed by a comparable volume of ratings — 10 and 4 respectively. Written reviews point the same way: 75% of CircadiaOS's written reviews are positive against 100% of Qstack Daily Mindset Questions's.

UpkeepUpdate frequency

CircadiaOS ships an update every 3 days, Qstack Daily Mindset Questions every 10 days. The most recent releases landed on October 7, 2026 and September 24, 2026 respectively.

Scorecard5 real differences · 5 level
CircadiaOS versus Qstack Daily Mindset Questions: the parameters behind the verdict, then further details
ParameterCircadiaOSQstack Daily Mindset Questions
PriceFreeFree
Rating3.8 (10 ratings)5.0 (4 ratings) — better
Positive reviews75.0% of reviews100.0% of reviews — better
Number of ratings10 — better4
Update frequencyEvery 3 days — betterEvery 10 days
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.015.1 — better
Further details — not scored
Size25 MB59 MB
Age rating17+4+
DeveloperCircadiaOS LLCNEXTGEN MARKET STRATEGIES LLC

Customer experience

CircadiaOS

All ratings10 ratings
Positive70.0%
Neutral0.0%
Negative30.0%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

Qstack Daily Mindset Questions

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

CircadiaOS

Subscriptions4
  • CircadiaOS Lite Monthly$9.991 Month
  • CircadiaOS1 Month trial$19.991 Month
  • CircadiaOS Lite Yearly$99.991 Year
Show 1 more
  • CircadiaOS1 Month trial$159.991 Year
5 purchases

Qstack Daily Mindset Questions

Subscriptions5
  • Qstack Weekly$1.997 Days
  • Qstack Weekly$3.997 Days
  • Qstack Monthly$9.991 Month
Show 2 more
  • Qstack Monthly$14.991 Month
  • Qstack Annual7 Days trial$99.991 Year

Questions

Is CircadiaOS free?
CircadiaOS is free to download, with in-app purchases available.
Is Qstack Daily Mindset Questions free?
Qstack Daily Mindset Questions is free to download, with in-app purchases available.
Which has better reviews, CircadiaOS or Qstack Daily Mindset Questions?
Qstack Daily Mindset Questions is rated higher. CircadiaOS averages 3.8 out of 5 from 10 ratings, while Qstack Daily Mindset Questions averages 5.0 from 4 ratings.
Do CircadiaOS or Qstack Daily Mindset Questions have ads?
CircadiaOS shows ads; Qstack Daily Mindset Questions does not.
Which is updated more often, CircadiaOS or Qstack Daily Mindset Questions?
CircadiaOS ships an update every 3 days, and Qstack Daily Mindset Questions every 10 days. Most recently, CircadiaOS was updated on October 7, 2026 and Qstack Daily Mindset Questions on September 24, 2026.

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