# COTWINS

> CoTwins study participant app requiring location access for research. (iPhone/iPad app by University of Colorado Boulder.)

- Source: https://appshunter.io/ios/app/cotwins/id983798285 (this page in markdown: same URL + `.md`)
- Developer: [University of Colorado Boulder](https://appshunter.io/developer/972210292)
- Category: Education
- Price: Free
- Rating: 4.75/5 from 4 App Store ratings
- Age rating: 4+
- Requires: iOS 11.0 · 101 MB
- Languages: English
- Released: 2015-05-01
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/cotwins/id983798285/reviews.md

## What is COTWINS?

This app is only for participants in CoTwins. If you have not already registered for CoTwins, this app will not do anything for you.

Upon opening the app, it will ask you to set your location permissions to "always", just like with the previous version. Please keep the location setting on "always". Contact support@cotwins.org with questions.

Logging in: If you are updating your existing CoTwins app, please note you will be required to log in using your username (which is your email address) and password. If you do not recall your password, but you do know your username email address, you can use the app to reset your password.


If you do not recall your username email, please reach out to support@cotwins.org to request it be sent to you.

Thank you for participating!

## Key features

- Participant-exclusive access
- Always-on location permissions
- User login with email
- Password reset functionality
- Direct support contact


## Frequently asked questions about COTWINS

### What is COTWINS for?

COTWINS is an application exclusively for registered participants of the CoTwins study. It requires users to grant 'always' location permissions to function as part of the research protocol.

### How do I log in to COTWINS?

To log in to COTWINS, use your registered email address as your username and your password. If you have forgotten your password, you can reset it through the app. For forgotten usernames, contact support@cotwins.org.

### Does COTWINS require location permissions?

Yes, COTWINS requires users to set their location permissions to 'always' for the app to function correctly as part of the CoTwins study.

### Who developed COTWINS?

COTWINS was developed by the University of Colorado Boulder, indicating its connection to academic research.

### What devices does COTWINS support?

COTWINS is supported on iPhone, iPad, and iPod devices, making it accessible to a wide range of Apple users.

### How often is COTWINS updated?

The latest version of COTWINS is 2.3, which was last updated on April 7, 2021. This suggests the app receives periodic updates to maintain functionality.

### What is the age rating for COTWINS?

COTWINS has an age rating of 4+, making it suitable for a broad audience of participants in the study.

### Can I use COTWINS if I haven't registered for the CoTwins study?

No, COTWINS is strictly for registered participants of the CoTwins study. The app will not function if you have not already signed up for the study.

## Version history (last 5 releases)

### 2.3 — 2021-04-07

2.3b52 -- 
Compressed picture when uploading.

### 2.2 — 2020-11-17

Picture uploading changes.

### 2.1 — 2020-08-22

Location accuracy update.

### 1.9 — 2020-08-03

Picture upload counter added, UI & session logic update.

### 1.7 — 2020-07-13

New Feature, Image uploading --
A goal of the CoTwins study is to understand the environments in which you live, work and play.
Please take at least 3 pictures of your surroundings every week.
To take a picture, tap the camera button. To upload from your photo library, tap the photo button.
To help preserve privacy, the app will attempt to identify faces in photos, and replace them with a white box.

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All apps by University of Colorado Boulder: https://appshunter.io/developer/972210292

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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.*