CircadiaOS vs Qstack Daily Mindset Questions
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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/
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.
- Personalized daily questions
- Lock screen notifications
- Neuroscience-based approach
- Cognitive Behavioral Therapy principles
- Identity-based transformation
- Answer writing for retention
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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
Verdict
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
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.
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.
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.
| Parameter | CircadiaOS | Qstack Daily Mindset Questions |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (10 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 75.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 10 — better | 4 |
| Update frequency | Every 3 days — better | Every 10 days |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 25 MB | 59 MB |
| Age rating | 17+ | 4+ |
| Developer | CircadiaOS LLC | NEXTGEN MARKET STRATEGIES LLC |
Customer experience
CircadiaOS
Qstack Daily Mindset Questions
In-app purchases
CircadiaOS
- CircadiaOS Lite Monthly$9.991 Month
- CircadiaOS1 Month trial$19.991 Month
- CircadiaOS Lite Yearly$99.991 Year
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- CircadiaOS1 Month trial$159.991 Year
Qstack Daily Mindset Questions
- Qstack Weekly$1.997 Days
- Qstack Weekly$3.997 Days
- Qstack Monthly$9.991 Month
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- Qstack Monthly$14.991 Month
- Qstack Annual7 Days trial$99.991 Year
Questions
Is CircadiaOS free?
Is Qstack Daily Mindset Questions free?
Which has better reviews, CircadiaOS or Qstack Daily Mindset Questions?
Do CircadiaOS or Qstack Daily Mindset Questions have ads?
Which is updated more often, CircadiaOS or Qstack Daily Mindset Questions?
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