# Arizona Twin Project > Longitudinal study app for gene-environment interplay in child health and development. (iPhone/iPad app by Leah Doane.) - Source: https://appshunter.io/ios/app/arizona-twin-project/id1568352674 (this page in markdown: same URL + `.md`) - Developer: [Leah Doane](https://appshunter.io/developer/1568352676) - Category: Utilities - Price: Free - Rating: 5.00/5 from 3 App Store ratings - Age rating: 4+ - Requires: iOS 12.0 · 13 MB - Languages: English - Released: 2021-05-21 - Data updated: 2026-06-01 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/arizona-twin-project/id1568352674/reviews.md ## What is Arizona Twin Project? The Arizona Twin Project is an ongoing longitudinal study designed to elucidate gene-environment interplay underlying the development of risk and resilience to common mental and physical health problems during infancy, childhood, and adolescence. The Arizona Twin Project spans individual, family, neighborhood, and sociocultural levels of analysis, with an emphasis on sleep, pain, physiological stress processes, mental and physical health, and academic competence. Importantly, our ethnically diverse sample is representative of the state of Arizona, thus affording the opportunity to consider the role of culture in the etiology of various child outcomes. ## Key features - Longitudinal study support - Gene-environment interplay research - Child and adolescent health focus - Sleep and stress data collection - Mental and physical health tracking - Academic competence monitoring ## Frequently asked questions about Arizona Twin Project ### What is the Arizona Twin Project app used for? The Arizona Twin Project app supports a longitudinal study examining how genes and environment influence the development of health and resilience in children and adolescents. It collects data on various aspects of development and health. ### What kind of data does the Arizona Twin Project app collect? The app collects data across individual, family, neighborhood, and sociocultural levels. Key areas include sleep, pain, physiological stress, mental and physical health, and academic competence. ### Is the Arizona Twin Project app free to use? Yes, the Arizona Twin Project app is available for free. It does not have any in-app purchases or advertisements. ### On which devices can I use the Arizona Twin Project app? The Arizona Twin Project app is currently supported on iPhone and iPod devices. It is not available for Android or other platforms at this time. ### How often is the Arizona Twin Project app updated? The app was last updated on April 14, 2024, to version 2.2. This indicates a commitment to ongoing maintenance and potential feature enhancements. ### What is the age rating for the Arizona Twin Project app? The Arizona Twin Project app has an age rating of 4+. This suggests it is suitable for children and adolescents involved in the study. ### Who developed the Arizona Twin Project app? The Arizona Twin Project app was developed by Leah Doane, who is also associated with the ongoing longitudinal study. ### What makes the Arizona Twin Project's sample unique? The study's sample is ethnically diverse and representative of the state of Arizona, allowing for consideration of culture's role in child development outcomes. ## Version history (last 5 releases) ### 2.2 — 2024-04-14 Added support for C16 ### 2.1.1 — 2024-02-18 Updated due date to noon for S15 morning surveys ### 2.1 — 2023-05-25 Added support for S15 ### 2.0.4 — 2022-08-06 Fixed a bug that would sometimes prevent participants from signing in ### 2.0.3 — 2022-08-01 Minor fixes ## More apps by Leah Doane - [LivesMix](https://appshunter.io/ios/app/livesmix/id6443520100) All apps by Leah Doane: https://appshunter.io/developer/1568352676 --- *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 2026-06-01.*