CARWatchApp

Objective saliva sampling

Free · Designed for iPad. Not verified for macOS.

Objective saliva sampling for research: barcode timestamping, flexible schedules, QR setup, and privacy-preserving logging for cortisol and diurnal studies. CARWatch is an open-source research application designed to support accurate and standardized saliva sampling in psychoneuroendocrinological studies. The app enables objective recording of sampling times using barcode scans and automated reminders, reducing reliance on self-reports and improving data validity. Originally developed for assessing the cortisol awakening response (CAR), CARWatch has evolved into a flexible framework supporting a wide range of saliva sampling protocols, including full diurnal cortisol profiling. Researchers can configure study parameters via a companion web interface and distribute QR codes to participants for seamless setup. The app then guides participants through the sampling process, records timestamps, and logs all interactions for later analysis. This app is a research-enablement tool and is not itself the sponsor, operator, or investigator of any specific study. It is used by external research teams and institutions to support the collection of CAR study data. Key features include: - Barcode-based logging of saliva samples for objective timestamping - Flexible alarm scheduling (relative to awakening or fixed clock times) - Support for multi-day and multi-sample study designs - Daily overview of completed, pending, and missed samples - Retrospective logging of missed samples - QR code–based study configuration - Built-in tutorial for participant guidance - Privacy-preserving design with no backend data storage CARWatch is intended for use in scientific studies and is not a medical device. It does not provide medical advice or diagnostics.

Ratings & Reviews

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CARWatch now uses Apple’s AlarmKit for more reliable wakeup and sample reminders, helping participants stay on schedule even when the phone is set to silent. This release also makes study days more robust: the app now handles missed samples more gracefully, keeps wakeup alarms moving forward, gives clearer guidance before scanning, and improves barcode validation to prevent wrong sample scans.

Version 1.1

The developer, Portabiles GmbH, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • VoiceOver

      • Larger Text

      • Dark Interface

    Information

    Seller
    • Portabiles GmbH
    Size
    • 5.5 MB
    Category
    • Health & Fitness
    Compatibility
    Requires iOS 16.2 or later.
    • iPhone
      Requires iOS 16.2 or later.
    • iPad
      Requires iPadOS 16.2 or later.
    • Mac
      Requires macOS 13.1 or later and a Mac with Apple M1 chip or later.
    Languages
    English and 2 more
    • English, French, German
    Age Rating
    4+
    Copyright
    • © 2026, Portabiles GmbH, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) and contributors to CARWatch
  • Developer Website
  • Privacy Policy

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