App Reviews /

Daylio Review

Daylio Screenshots


3.67 / 5.00

Overall Score: 11/15

Consumer Ratings: 2/2
Proposed Goal: 2/2
Evidence Based Content: 1/1
Software Updates: 2/2
Clinical Input in Development: 0/1
Research on Development Process: 1/1
Efficacy of Other Products: 0/1
Research Independence and Review: 2/2
Research Base: 1/3

Rating Date: August 2020

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User Experince

User Experience

4.14 / 5.00

Engagement: 3.8 Functionality: 4.88 Aesthetics: 4.00 Information: 3.88 Subjective quality score: 3.25 Perceived impact score: 3.08 Rating date: February 2018 Rated by: Queensland University

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Overall Score: Questionable

Does the app have a privacy policy?:Yes

Does the policy describe the information storage and sharing procedures related to user entered information OR state that user information is stored locally?:Yes

Does the app provide the option of a pin entry or log-in process to view and enter user data?:Yes

Does the privacy policy state that the app/server encrypts the entered data OR state that user inf

ormation is stored locally?:Yes
Does the privacy policy state whether or not users can delete entered information OR state that user information is stored locally?:No/Can’t Tell

Does the privacy policy state whether or not users can edit entered information OR state that user information is stored locally?:No/Can’t Tell

Learn more about the Transparency Rating

Daylio is designed to help users to record and track mood over time. Each day users can record their mood, activities they did, and any other notes. Users can also view all of their previous entries. The “Stats” section displays the user͛s monthly mood chart, mood count, any pattern of a mood associated with certain activities, etc. The “Calendar” screen provides a color coded calendar to indicate the daily mood or other monthly patterns. “Settings” allows the user to set daily reminders to check-in with the app or to purchase premium and unlock additional features.

Read the Professional Review for Daylio: A Professional Review

Technical Details

Available for: Requires iOS 11.2 or later. Compatible with iPhone, iPad, and iPod touch. Requires Android 4.1 and up.
Developer: Relaxio s.r.o.
Type of Treatment: Symptom Tracking/Self-Monitoring, Cognitive Behavioral Principles
Targeted Conditions: Mood Disorders, Stress and Anxiety
Target Audience: Not Specified
Designed to be used in conjunction with a professional? No
Languages Available: English, Bulgarian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Serbian, Simplified Chinese, Slovak, Slovenian, Spanish, Swedish, Traditional Chinese, Turkish, Ukrainian
Cost: Free with in-app purchases
Get it on: Apple App Store, Google Play

Research on this App

In “The Effectiveness, Efficiency and Reliability-in-Use of Daylio Mobile App” (Hussain et al., 2020), 14 participants were conscripted to examine the effectiveness, efficiency, and reliability-in-use from the State of Kedah in Malaysia. There were 7 postgraduate students and 7 civil servants, with 12 being novice users and 2 being moderate users in terms of experience. There were 11 males and 3 females. The participants were allowed to either use their personal phones or the moderator’s phone in order to perform each task required of them, which were then recorded for task time and error recording. The 4 tasks include the following: check status, add new mood entry, check weekly reports, and edit activities. The participants were encouraged to think aloud while doing these respective tasks in order to gauge reaction and response of users toward the app. The task completion time is used as a measure for the efficiency of the app, while task error rate is meant as a measure for reliability in use. The outcomes show that Daylio is fast and efficient for use, and generally speaking — reliable in use. However, it was decided that there are further issues that needed to be fixed to further enhance the quality of the app as to improve its performance and market penetration. (Hussain et al. 2020.

How we evaluate

We review apps against rating criteria developed by experts in the field. Some of those criteria are:



We look at the research supporting the technology and the credibility of the development process.



We review privacy policies to see if key pieces of information about what happens with entered data are addressed.


User Experience

We explore how fun, functional, easy-to-use, engaging, and interesting the technology is.


Professional Reviews

A professional in a relevant field downloads and uses the technology and writes a narrative review, highlighting pros & cons and some recommendations for use.

Learn More About Our Criteria