Table 1.

App Quality Assessment Scoring System (AQASS) ratings of mobile apps (N=64) containing prenatal genetic testing information.

Criterion and description		AQASS score	Frequency distribution (%)
Number of prenatal genetic tests mentioned
	Using the general term “(prenatal) genetic testing” only	0	3
	1-5 prenatal genetic tests	1	67
	6-10 prenatal genetic tests	2	30
	All 10 prenatal genetic tests	3	0
Comprehensiveness of information
	Only mentioned the name of the prenatal genetic test	0	2
	Having information in 1 or 2 of the following 5 categories: test procedures, timing of the tests, reliability or accuracy of the tests, interpretation of test results, and specific diseases or conditions to be tested for	1	25
	Having information in 3 or 4 of the following 5 categories: test procedures, timing of the tests, reliability or accuracy of the tests, interpretation of test results, and specific diseases or conditions to be tested for	2	38
	Having information in all of the following categories: test procedures, timing of the tests, reliability or accuracy of the tests, interpretation of test results, and specific diseases or conditions to be tested for	3	36
Quality of information
	Information too general to assess quality	0	3
	Most information is incorrect	1	2
	Some incorrect and/or out-of-date information	2	25
	Correct and up-to-date information	3	70
Reliable information sources
	No reference identified	0	75
	Questionable/unreliable source(s)	1	3
	Source from hospitals, specific obstetricians-gynecologists, or peer reviewed articles	2	13
	Source from authoritative organizations, such as the American College of Obstetricians and Gynecologists	3	9
Evidence base
	App had not been trialed or tested	0	98
	App had been tested (eg, acceptability, usability, and satisfaction ratings) and had positive outcomes in studies that were not randomized control trials (RCTs), and there was no contradictory evidence.	1	2
	App had been trialed and outcome tested in 1-2 RCTs indicating positive results	2	0
	App had been trialed and outcome tested in >3 high quality RCTs indicating positive results	3	0
Readabilitya
	Not applicableb	0	3
	>6th grade	1	95
	≤6th grade	2	2
Visual informationc
	Absent	0	92
	Present	1	8
Customizationd
	Absent	0	100
	Present	1	0
Interactivitye
	Absent	0	31
	Present	1	69
Text search function
	Absent	0	61
	Present	1	39
Navigation ease
	Hard to navigate	0	14
	Easy to navigate	1	86
Layout of the app
	Inappropriate, unclear, and/or some options difficult to select, locate, find, or read	0	3
	Appropriate, clear, and able to select, locate, find, or read items	1	97
Visual appeal
	Unprofessional or unappealing	0	2
	Professional and appealing	1	98
Interdevice compatibility
	iPhone or Android phone	0	41
	iPhone and Android phone	1	59
Connectivity
	Internet not required	0	58
	Internet required	1	42
Price
	Paid	0	0
	Free	1	100

^aReadability was assessed by Flesch-Kincaid grade level assessment. According to Weiss [23], mobile health apps are recommended to have a reading level of sixth grade or below for general public use.

^bApp did not have enough text and/or complete sentences to allow for the calculation of Flesch-Kincaid grade level for readability.

^cVisual information was defined as the presence in the app of photos, images, tables, figures, and videos to demonstrate pregame genetic tests

^dCustomization referred to a function that allows users to input prenatal genetic test results, testing dates, and other information in settings or preferences of the mobile app.

^eInteractivity allowed users to provide feedback to the developers, offer reminders on the timing of prenatal genetic testing, have a chatroom function, and allow sharing information onto the social media.