This review aimed to answer the following questions: “What are the available mHealth apps in the Malaysian market for common NCDs?” “What are the app features available in the mHealth apps for NCDs in Malaysia?” and “What is the quality of the mHealth apps for NCDs in Malaysia?”

The search was conducted from July 7, 2022, to August 14, 2022, on the Apple App Store (Apple Inc) and Google Play Store (Google LLC) using the search terms weight loss, obesity, diabetes, hypertension and cardiovascular diseases, stroke, weight management, and diet. The search terms were identified using appropriate Medical Subject Headings terms as well as the free text of keywords. The selected NCDs were chosen because they are among the most prevalent chronic diseases in Malaysia and around the world.

To be eligible for inclusion in this review, the title and content of the identified mHealth apps were screened and filtered based on the descriptions provided by the app developer. An app met the inclusion criteria if it (1) was developed in English; (2) had self-monitoring feature(s); and (3) was developed for chronic disease management, namely obesity, type 2 diabetes, hypertension, and cardiovascular disease. An app was excluded based on the following criteria: it was a heart rate tracker, exercise tracker, or game; or it was a medicine-delivery, appointment-based, recipe-sharing, or research study app.

The data were extracted based on feature categories, which included (1) type of health management, (2) number of downloads, (3) country of the developers, and (4) app features. A data extraction table with the mHealth apps’ basic information, such as country of origin, name of app developer, and number of downloads, is shown in Table 1. The details of the mHealth apps’ features and characteristics are outlined in Multimedia Appendix 1.

After obtaining the screening results, we performed a descriptive analysis, comparison, and functionality assessment based on the information provided by the app developers. In addition, we analyzed the mHealth apps’ category, as well as whether health care experts were involved, whether they were based on scientific testing, and whether they had self-monitoring, based on the description provided by the app providers. Additional information, such as star ratings and the presence of a privacy policy, was also tabulated. A star rating offers a quick overview of an app’s overall user satisfaction, making it a valuable component of quality assessment. The presence of a privacy policy reveals how an app manages user data, ensuring the protection of users’ private health information, which is crucial for informed decision-making.

The quality of the mHealth apps was assessed using the validated MARS evaluation tool, which has demonstrated excellent internal consistency (α=.90) [28]. The MARS has 4 sections for objective evaluation: engagement (eg, the level of entertainment provided, interactivity, and appropriateness of app content), functionality (eg, app performance, ease of use, and navigation), aesthetics (eg, layout, graphics quality, and overall visual appeal), and information (eg, accuracy of the app description, source of information, and quality of information). The subjective quality evaluation section of the MARS subscale has 4 items. However, we excluded this section in this study as the aim was to assess the apps’ quality objectively. Each item was evaluated using a Likert scale with a score range from 1 (inadequate) to 5 (excellent). The overall quality score was calculated based on the mean scores for each of the 4 sections. A mean score of 3 was considered the minimum acceptable score, whereas a score greater than 4 of 5 was preferable. Before the evaluation, 2 authors independently used each of the apps and conducted the quality assessment in agreement with each other; disagreements were resolved through discussion with a third author.

Our search found a total of 1156 apps through keyword retrieval from the Apple App Store and Google Play Store (Figure 1). After removing duplicates, 323 apps were screened; 150 apps met the inclusion criteria as apps focusing on selected chronic disease management (iOS: n=103; Android: n=47) and were included for eligibility assessment. Among them, 42 were included in this study for analysis.

A total of 42 apps (n=28 Android and n=14 iOS apps) were included in this review. Among these, 31 (74%) were for weight management while 11 (21%) were dedicated to chronic disease health management. The chronic diseases commonly targeted by the apps included cardiovascular disease (n=1, 2%), type 2 diabetes (n=3, 7%) and hypertension (n=5, 12%). However, there were 9 apps (21%) that did not specify which chronic diseases they targeted. Most of the apps received recent updates, in the year 2022. The general characteristics of the mHealth apps are described in Table 2. The download count is exclusive to Android apps, as this information was not obtainable for iOS apps.

As shown in Table 1, about 81% (n=34) of the apps provided in-app purchases for live-chat subscriptions, ad removal, and premium feature subscriptions ranging from weekly to yearly, among others. The price for each purchase was between US $0.66 to US $203.26. All the apps included in this review can be freely downloaded by users. Most of the apps (n=15, 36%) were developed in the United States, followed by India (n=7, 17%), Malaysia (n=3, 7%) and Singapore (n=2, 5%).

Two apps on the Google Play Store and 6 apps on the Apple App Store received no reviews. The number of users (more than 1 million) who provided ratings for Android apps was significantly greater than the number for iOS apps. Most apps received a user rating of more than 4 stars of a total of 5. In this study, all the apps had a privacy policy. Table 3 shows the star ratings and privacy policies of the included apps.

The most common feature that was available on the mHealth apps was self-monitoring (n=35, 83%), which allows users to track their body weight, food intake, fluid intake, and other health indicators. Approximately 16 of 42 apps provided online consultation or personalized feedback via the app as well as goal-setting features (n=35, 83%). Meanwhile, there were no evidence-based apps that used scientific testing or multidisciplinary team involvement in app development, based on the descriptions provided by the developers. About 62% of apps (n=26) introduced at least 1 health care professional (eg, health coach, nutritionist, or dietitian) in the health management of the app. The overview of the functionality characteristics of the apps is presented in Table 4.

The average MARS score among the 42 apps was 3.2 of 5, with a range between 2.0 and 4.1. Of the 4 MARS domains, functionality scored the highest (3.9/5), followed by aesthetics (3.2/5), information (3.1/5), and engagement (2.9/5). There was a large gap in the scores of each subdomain, with the engagement score ranging from 1.6 to 4.0, functionality score ranging from 3.0 to 5.0, aesthetics score ranging from 1.0 to 5.0, and information score ranging from 1.7 to 5.0. The MARS functionality score had the smallest range, and the information score had the largest range. Table 5 shows the MARS subdomain ratings and the total mean score.

Most NCD management apps in Malaysia lack scientific evidence of efficacy, do not involve multidisciplinary teams, and require significant feature improvements. This study provides a snapshot of current mHealth apps for common NCDs in 2022 that were primarily commercially based. It revealed that the mHealth apps varied in terms of features, functionality, and disease management. The most common category that the mHealth apps currently focus on is self-management of weight, followed by hypertension and type 2 diabetes. Some apps need to be purchased to access extended features, health management information, and medical advice.

Self-monitoring or self-management are crucial components of long-term chronic disease management. Self-management of chronic diseases has been reported to be related to positive health outcomes among patients [29]. Most of the mHealth apps (n=35, 83%) from this study incorporated self-monitoring features that allow the user to monitor their weight, blood pressure, blood glucose level, dietary intake, and fluid intake. The most common self-monitoring features found in the apps were weight trackers, food intake trackers, and step trackers. As technology has advanced, self-management through mHealth apps has been the subject of investigation. Systematic reviews in Korea [14] and the United States [12] examined their impact, shedding light on their potential role in achieving desirable health outcomes through self-management. This suggests that self-monitoring features in mHealth apps may be instrumental in achieving desirable health outcomes.

Some of the apps (n=15, 36%) incorporated social support features to allow users to engage with other users as well as health professionals. These social features could be key for users to continue engaging with the mHealth apps to improve their health. Social support has been shown to improve patients’ health and well-being, and this also applies to online social support networks [30]. Only 38% (n=16) of the apps offered communication with health care professionals via instant messaging or robotic automated message chat functions. These features are beneficial in the self-management of NCDs, as they allow the user to communicate with a health care professional and receive immediate feedback. There is evidence that 2-way communication between patients and health care professionals can improve health outcomes [31]; therefore, app developers should prioritize the inclusion of communication features and health care professionals in app management.

This study reveals a lack of evidence supporting the use of mHealth apps, with none of the apps reporting scientific evidence to indicate the effectiveness of their health management. Based on the star ratings, we cannot deny that mHealth apps could potentially help users improve their health outcomes. Given the fact that most apps on the Apple App Store (iOS) and Google Play Store (Android) did not provide evidence-based testing to prove their effectiveness [32], the app developers were able to make false or misleading claims about their apps. Moreover, health care providers are less likely to feel skeptical of the role of mHealth apps in health care management if the app is supported by research as clinical evidence [33].

The multidisciplinary team approach is a treatment domain that optimizes the health of patients with chronic diseases [34]. Promoting a multidisciplinary team approach is crucial for coordinating the health care system and aiding patients in self-management [35]. However, our research revealed that the majority of mHealth apps did not incorporate a multidisciplinary team to support health management. In this study, only 16% (n=7) of the apps indicated the participation of medical doctors, specialists, nurses, or dietitians. Our findings emphasize the need for multidisciplinary team involvement in health management by using reliable and high-quality mHealth apps. mHealth apps have the potential to function as proactive disease self-management tools [36], meeting diverse needs through collaborative efforts with multidisciplinary teams within the realm of mHealth technology.

The apps in the app stores generally had high star ratings, ranging from 4.3 to 4.6 of 5 stars, which may suggest good user satisfaction. However, it is important to note that user ratings may not always accurately reflect app quality. Therefore, the MARS was used in this study. The overall MARS score of the included apps was 3.2 of 5, which is considered acceptable. Considering the maximum and minimum MARS scores, substantial variability was observed across domains, including aesthetics, which had a range from 1.0 to 5.0. This variance may indicate a significant diversity in app quality, with some evidence suggesting the presence of low-quality apps currently available in the market. However, lower MARS scores could potentially be attributed to reviews of freely available app features.

The review and analysis of mobile app quality for common chronic diseases is crucial for future mHealth app development, as poor app quality can limit their effectiveness in health management [37]. Research on the quality of mHealth apps in Southeast Asia is limited, and the existing studies have primarily focused on COVID-19–related apps rather than those related to chronic disease management [38,39]. Therefore, the authors compared the MARS results with health care app studies from other countries. Our findings align with an assessment of nutrition-related mHealth apps in Korea, where the majority received an average rating, with a mean score of 3.28 of 5 [40]. In contrast, health apps designed for behavioral change in Denmark achieved a slightly higher average quality score, with an average MARS score of 3.48 of 5 [26]. Consistent with previous studies, our study revealed that functionality was best rated (3.9/5), whereas engagement consistently received the lowest score, with the mean score being 2.9 of 5 [41,42]. This indicates that the app developers focused on the functionality of the apps as an essential element in delivering outstanding experiences to the users. On the other hand, some studies discovered that information scored the lowest or fell into the low-to-moderate category [43-45]. This discrepancy highlights that the mHealth apps in the market need special attention to provide more advanced and effective features and capabilities for health management. Importantly, our results indicate that the key areas for improvement in mHealth apps are engagement and information. App developers should prioritize these domains, focusing on customization, interactive information delivery, and the integration of prompts such as feedback and reminders. Additionally, enhancing sharing functionality and offering more evidence-based content, engaging visuals, and data-driven information for users would improve the overall mHealth app quality.

From a health management perspective, mHealth interventions offer a significant opportunity to facilitate the monitoring of chronic conditions and improve self-management skills [14,24,26]. Evaluating the quality of mHealth apps can help us identify their positive impact on health and behavior outcomes among people with chronic diseases. According to Ryan and Sawin [46], who described an individual and family self-management theory, successful self-management should involve three key components: (1) individual competence, (2) individual motivation, and (3) social factors. mHealth apps have the potential to bridge these factors together to facilitate health management. Additionally, mobile technology promises to enable real-time remote monitoring systems and prompt feedback systems to improve health management [12]. App developers and users should be alert, as our findings show that most apps available in the market are lacking such components.

The strengths of this study included that the findings were derived and evaluated from the clinical point of view, the study used a validated tool to determine the quality of mHealth apps, and the results can publicly provide review data to users as well as further direction for mHealth app development. This study has several identified limitations. First, we conducted a comprehensive review solely of the apps’ free features, excluding premium features due to budget constraints. Second, at the time the study was completed, it is possible that new mHealth apps or updated features had been released, which we were unable to consider. Third, the review was limited to specific common NCDs, and we could not provide an overview of other diseases. Fourth, our focus was on English-language apps available for download in commonly used mobile app stores, which might limit the generalizability of our findings. According to the world’s largest ranking of countries and regions by English skills, Malaysia ranks among the top 3 in the English Proficiency Index among Asian countries [47]. Nevertheless, we acknowledge that the focus on English-language apps could result in some percentage of Malaysians being left out. Importantly, app developers and researchers are increasingly recognizing the need to cater to diverse linguistic needs within mHealth apps to address the cultural and language diversity of countries like Malaysia [48,49].

The findings of this study reveal that the current mHealth app market for managing NCDs in Malaysia is still in its nascent stages and is marked by a shortage of high-quality mHealth apps. In contrast to a previous study conducted in Malaysia in 2017, which predominantly featured informational apps [50], the market is currently undergoing a shift. It is now pivoting toward health management apps. This changing trend underscores the potential for mHealth technology to serve as a cornerstone in the management of chronic diseases in the future. For instance, the results of a prior study that specifically examined hypertension indicated that health care apps could serve as valuable additions to conventional treatment methods [51]. To effectively address NCDs, mHealth apps should incorporate self-monitoring capabilities, such as health tracking, goal setting, and personalized feedback. Additionally, app developers should emphasize elevating the overall quality of their apps by incorporating a variety of perspectives, including input from relevant health professionals and the integration of scientific evidence. It is essential to include this information in the app description to establish trust among users.

A search for mHealth apps for common NCDs available in the Google Play Store and the Apple App Store revealed that most apps focused on weight management, followed by hypertension and type 2 diabetes mellitus. Self-monitoring features such as weight trackers, diet trackers, and step trackers are the core functions of current mHealth apps. This review also highlights the current market’s lack of evidence-based mHealth apps designed specifically for the self-management of chronic diseases. The lack of multidisciplinary teams in app development and health management was observed in the app stores. Evidently, the quality of mHealth apps currently available in the market should undergo ongoing assessment and enhancement to optimize their benefits for users in the realm of health management. Reviews of these apps can offer valuable insights to researchers, health care providers, and app developers, aiding them in delivering high-quality apps for effective health management. App developers and public health authorities should prioritize the development of evidence-based mHealth apps to enhance the mHealth ecosystem for users. Future studies on mHealth content analysis and app evaluation should encompass a broader spectrum of diseases, aiming for a more comprehensive approach that benefits diverse populations.