# Quantified Citizen — Get personalized health data.

> Track personal health factors and join scientific studies for health insights. (iPhone/iPad app by Quantified Citizen Technologies Inc..)

- Source: https://appshunter.io/ios/app/quantified-citizen/id1485884140 (this page in markdown: same URL + `.md`)
- Developer: [Quantified Citizen Technologies Inc.](https://appshunter.io/developer/1475069860)
- Category: Health & Fitness
- Price: Free
- Rating: 4.08/5 from 98 App Store ratings · 73 written reviews indexed
- Age rating: 12+
- Requires: iOS 13.0 · 60 MB
- Languages: English
- Released: 2019-11-13
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/quantified-citizen/id1485884140/reviews.md

## What is Quantified Citizen?

Get health data two ways: 
1) Track health factors independently 
2) Join a study
Or do both!

Health factors you can track without having to join a study:
* Anxiety
* Depression
* Stress
* ADHD
* Mood
* New scales are added regularly!

If you prefer to join studies, we have a range for you to choose from:
* Microdose.me - The largest mobile microdosing study in the world. Led by Paul Stamets and a global team of scientists.
* Mental Health Tracker - Ever wonder if your mental health is affected by a new routine or treatment regimen like light therapy, mindfulness, or a new medication? Find out with our tracker.
* Sobriety and Well-being - Through a series of simple tests, daily check-ins, and optional wearable sleep data, we aim to find out how sobriety from alcohol affects sleep quality and dream recall.
* Gratitude Study - Led by Louie Schwartzberg, we explore “visual healing” and ask: does watching films about gratitude correlate with improvements in well-being?
* More studies in the app!

How It Works
1) Download the app and join as an anonymous participant – we won't ask for your name or email.
2) Answer questions, watch videos, and play game-like tests. Easy!
3) Automatically track your steps, sleep and more by connecting Apple Health and your wearables.
4) Receive rich health insights at the end of a study and improve your health along the way.

What to Expect 
* Complete Privacy - We're committed to data privacy, encryption, anonymity and transparent policies. No sign up, no email, no Facebook connection required.
* Top-Quality Research - Our studies are rigorously designed with scientific protocols to produce credible findings. 
* Personalized Health Insights - See your health trends and patterns whenever you complete a study. Compare your data anonymously with other participants. The more studies you join, the more you learn about yourself! 

Learn more about your health while contributing to science today!

## Key features

- Track anxiety, depression, and mood
- Participate in microdosing studies
- Monitor mental health and routines
- Analyze sobriety and well-being
- Explore gratitude and visual healing
- Connect Apple Health and wearables
- Receive personalized health insights

## What do users think of Quantified Citizen?

Overall sentiment: negative

**Pros**

- 💡 Interesting study concepts
- 👍 Easy to use interface
- 💡 Great idea for research
- 👍 Polished UI
- 💡 Insightful videos

**Cons**

- 🐛 App crashes frequently
- 🐛 App is unusable
- 🐛 Server errors during sign up
- 🐛 Login issues
- 🐛 Screen refreshing/unresponsive
- 🐛 Biometric authentication loop
- 🐛 Incomplete questionnaires
- 🐛 Missed deadlines due to no notifications
- 🐛 Broken feedback option
- 🐛 No response from support
- 🐛 No results received
- 🐛 Video lag/streaming issues
- 🐛 Locked activities
- 🐛 Inaccurate tap tests
- 🐛 App not maintained
- 🐛 Sign up errors
- 🐛 Blank screens
- 🐛 Password entry issues
- 🐛 Bad phrasing in questionnaires
- 🐛 Request timeouts
- 🐛 Duplicate notifications
- 🐛 Daily questionnaire status issues
- 🐛 App not flowing well

**Commonly reported bugs**

- Persistent crashing
- Not working for weeks
- Screen keeps refreshing
- Server error on sign up/login
- Stuck before questionnaire completion
- Biometrics authentication loop
- Never notified about new surveys
- Feedback option broken
- Tap test unresponsive
- App not functional/maintained
- Cannot complete surveys requiring reordering
- Error message: type “bool” is not a subtype of type ‘iterable<dynamic>’
- Email already in use error during sign up
- Blank screen on last demographic question
- Cannot enter passwords, erases as scrolling
- Request timeout during sign up
- App crashes on M-D study
- App crashes after consent
- Videos don't stream
- Videos lag badly
- Activities locked, missed notifications
- Intake questionnaire needs to be completed but was
- Daily questionnaire marked as completed when new day
- Duplicate push notifications
- Missed yesterday's period despite checking daily
- New tasks are red and unclickable

**Most requested features**

- Add Russian language support
- Improve notification system for surveys
- Allow viewing of study results
- Increase time window for completing activities
- Add more alarms for incomplete tasks

## Recent user reviews (10 of 73)

All indexed reviews: https://appshunter.io/ios/app/quantified-citizen/id1485884140/reviews.md

### 1/5 — Persistent crash

*2026-02-13, version 2.10.2*

All this app does is crash. from the studies that I can see before it prompts me to use my biometrics to sign in again after roughly 3 seconds, the studies look super interesting! But alas…it won’t allow me to even stay on a screen long enough to even across or click on anything.

### 1/5 — Not working for a few weeks

*2026-02-02, version 2.10.2*

I was using the app for a few days and enjoying it but then about three weeks ago it went dead. I can’t  log in or create a new account. When I try to log in with my pass phrase it says that I haven’t signed up yet. If I try to start a new account it stops and says there is a server error and to try again later. I hope this can be fixed because I was looking forward to using it

### 1/5 — Doesn’t work

*2025-09-11, version 2.10.2*

Mine doesn’t work. Screen keeps refreshing making it impossible to use.

### 1/5 — Issues? Can’t sign up

*2025-09-02, version 2.10.2*

Keeps reporting a server error to try again later. Uninstalled and reinstalled; same thing?!?

### 2/5 — Damn..

*2025-08-01, version 2.10.2*

there seems to be some problem I get stuck before the questionnaire is finished a couple times now I gave up using it

### 1/5 — Urgent

*2025-07-31, version 2.10.2*

The only reason for one star is to garner attention. Upon opening the app it will repeatedly use biometrics (facial recognition) to authenticate me. Even upon recognizing my face it will repeat, making the app unusable. 

Please fix this, I would love to continue participating.

### 5/5 — Пожалуйста обратите внимание

*2025-01-02*

Здравствуйте уважаемые разработчики, я нахожусь на территории страны Россия, недавно смотрел подкаст с Пол Стемец
и узнал очень много всего интересного, он рассказал о вашем приложении и я захотел поучаствовать, к сожалению я не так хорошо знаю Английском язык как хотелось бы, прошу найдите время и средства для добавления русского языка, я с удовольствием буду пользоваться вашим приложением

### 2/5 — Good concept, poor execution

*2024-11-05, version 2.10.2*

I really enjoyed the study I took. However, there are several major errors that caused this 2 star review

1: despite notifications being on, I was never notified about new surveys being available and missed deadlines as a result. 

2: the feedback option is broken and unavailable 

3: finished my study about 2 months ago and still haven’t received results as of the date of this review 

4: reached out to support team and never received a response. 

- the lack of results and response from support team made all that time I invested into the study definitely not worth it.

### 4/5 — Bugs/Glitches

*2024-08-06, version 2.10.2*

The app is a wonderful idea, and I think it’s all very well done. The problem I personally am experiencing is two-fold: 
1) despite all the notification settings being turned on, it won’t tell me when the questionnaires become available, nor when they are about to expire. 
2) the feedback option in the app, the place to relay this problem to the developers, doesn’t work for me. It comes up with a failure/error message.

I don’t check this app as often as is required to fill out the questionnaires. It doesn’t say how often the questionnaires appear (weekly? More? Idk), and I never get a notification. Please fix that glitch.

### 5/5 — Good. A few bugs

*2024-04-21, version 2.10.2*

The app is easy to use. I find the questionnaires and tests well explained. There’s a bug on one of the tests where if you select one of the options “I don’t remember,” etc, you are then prevented from tapping on the box to enter a number. Also, the feedback section of the app gave me an error.

## Frequently asked questions about Quantified Citizen

### What does Quantified Citizen do?

Quantified Citizen allows you to track various personal health factors such as anxiety, depression, and mood. It also provides opportunities to join scientific studies on diverse topics, offering personalized health insights based on your data.

### What kind of studies can I join?

You can join a range of studies, including the Microdose.me study, a Mental Health Tracker to see how routines affect well-being, a Sobriety and Well-being study, and a Gratitude Study exploring visual healing. More studies are regularly added to the app.

### Is Quantified Citizen free to use?

Yes, the application is free to download and use. There are no in-app purchases or advertisements mentioned in the provided description, indicating a completely free experience for users.

### How does the app ensure privacy?

The app is committed to complete privacy, encryption, anonymity, and transparent policies. It does not require sign-up, email, or Facebook connection, allowing users to participate as anonymous individuals.

### What are the benefits of using Quantified Citizen?

By using Quantified Citizen, you can gain a deeper understanding of your health trends and patterns, receive personalized health insights, and contribute to high-quality scientific research. You can also compare your data anonymously with other participants.

## Version history (last 5 releases)

### 2.10.2 — 2024-04-10

Smoother onboarding process for new users

### 2.10.0 — 2023-03-15

Major enhancements to our Wellness Tracking feature including: adding custom trackers in the form of daily habits and measurements, offering suggested trackers for new users, a timeline view of wellness tracking for the ability to add data retroactively, and the ability to visually compare tracker data to explore correlations. 

Plus we've fixed a number of bugs and made performance enhancements to provide a smoother and faster user interface.

This release is recommended for all users.

### 2.9.3 — 2023-01-19

Design updates to the Activities page.

Optimized notification system - Fixes issue where some users did not receive notifications

Plus we've fixed a number of bugs and made performance enhancements to provide a smoother and faster user interface.

This release is recommended for all users.

### 2.9.2 — 2022-12-23

Design updates to the Activities page.

Optimized notification system - Fixes issue where some users did not receive notifications

Plus we've fixed a number of bugs and made performance enhancements to provide a smoother and faster user interface.

This release is recommended for all users.

### 2.9.1 — 2022-12-08

Design updates to the Activities page.

Optimized notification system - Fixes issue where some users did not receive notifications

Plus we've fixed a number of bugs and made performance enhancements to provide a smoother and faster user interface.

This release is recommended for all users.

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## More apps by Quantified Citizen Technologies Inc.

- [Quantified Citizen Pro](https://appshunter.io/ios/app/quantified-citizen-pro/id1580605645)

All apps by Quantified Citizen Technologies Inc.: https://appshunter.io/developer/1475069860

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*