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Usability Evaluation of the Karafs Application: A Qualitative Study Using the Think-Aloud Method.

Fatemeh Bohlouly¹, Azam Kheirdoust², Kosar Ghaddaripouri^3,4

¹Department of Health Information Technology Varastegan Institute for Medical Sciences Mashhad Iran.

Health Science Reports

|January 2, 2026

Summary

The usability of the popular Karafs mobile health app was evaluated using the think-aloud method. Key issues identified include unclear messages and navigation problems, impacting user efficiency and requiring improvements.

Keywords:

Karafs application health information systems think‐aloud method usability evaluation

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Area of Science:

Mobile Health
Usability Engineering
Human-Computer Interaction

Background:

The Karafs application is a widely used mobile health tool in Iran with nearly 5 million users.
It offers features for personalized diet plans, healthy cooking, and sports training to promote healthier lifestyles.

Purpose of the Study:

To evaluate the usability of the Karafs mobile application.
To identify user interaction challenges and areas for improvement within the application.
To enhance the overall effectiveness and user experience of the Karafs app.

Main Methods:

The think-aloud method was employed to assess the Karafs application.
Fifteen participants (13 women, 2 men; mean age 22 years) engaged in the usability evaluation.
Identified usability problems were categorized and their severity was assessed.

Main Results:

Several usability issues were detected, predominantly concerning unclear system messages and navigation difficulties.
The majority of identified problems were minor, yet they had a notable impact on user efficiency.
The think-aloud method proved effective in uncovering these user interaction challenges.

Conclusions:

The think-aloud method successfully identified usability issues within the Karafs application.
Addressing the identified usability problems can significantly improve the application's functionality.
Enhancements to the Karafs app can further support users in adopting healthier lifestyle choices.