Feather Squadron vs eVAS
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Feather Squadron
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This app contains a variety of fun games for children to play (ages 5 and up) and we measure their listening abilities while they play! This app has a quick screening option for parents and teachers, and a comprehensive testing option for appropriate professionals only. This version has been localised for England. Please see other versions for other countries/accents. For Teachers and Parents: If you think that your child has listening, language or learning problems that might be related to auditory processing, you can use our quick screening to find out if there are any concerns. If you are concerned, regardless of the screening results, we recommend you visit your local audiologist or speech-language pathologist and recommend this app to get your child's auditory processing abilities tested thoroughly as well as traditional hearing testing performed. This app contains a variety of fun games for children to play (ages 5 and up) and we measure their listening abilities while they play! Your specialist can then recommend the appropriate action including treatments and strengthening exercises based on these results. For the professional: Researchers for years have shown the importance of auditory processing abilities and their correlations to language, reading, and educational abilities. Professionals (audiologists, speech-language pathologists, educational psychologists, paediatricians, etc) have not been able to measure auditory processing abilities routinely. There are a variety of reasons given for this; time-constraints, cost-constraints, limited knowledge on how to administer, limited knowledge on how to interpret the findings. Now, the team at Acoustic Pioneer have created a fast, fun, and easy way to measure multiple areas of auditory processing using an iPad app! The assessment app has been developed and normed on over 1000 children. The results are analysed immediately and you will receive a report on the results for your client comparing their ability to that of same-aged peers and will come with recommendations including therapy options, suggestions for teachers, compensatory strategy suggestions, or other information that would be helpful.
eVAS
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The Electronic Visual Analog Scale (eVAS) is an ad-free iPad app that allows users to digitally track visual analog scores using 10 cm slider channels with various customizations and export saved data in tables. It can be used as a pain scale tracker or for any other application that requires user input tracking on a 10 cm visual analog scale.* eVAS was designed and developed in 2023 by Ryan Tennant in partnership with the Biomechanics and Injury Prevention Lab at the University of Waterloo. Funding for this app was provided through the Centre of Research Expertise for the Prevention of Musculoskeletal Disorders (CRE-MSD) that receives funding through a grant provided by the Ontario Ministry of Labour, Immigration, Training and Skills Development. We provide our users with various customizations unique to eVAS. Users can customize their collection settings by: - choosing one of three default images or uploading an image from their device to be stored locally, - specifying a session identification label, - setting left and right anchor label text, - selecting among 1-22 collection channels to record visual analog scores, - setting a recurring alert reminder within the app, and - exporting their data in .CSV or .XLSX format via e-mail or other file-sharing methods available on their device. Find the complete instructions and other information on using eVAS under the info icon on the Collection Settings screen. *The slider length is 10 cm โ output scores range from 0 to 1 for each channel with a precision of 6 digits. The 10 cm visual analog scale and threshold values for clinically relevant pain have been previously evaluated in clinical research applications with humans, such as detecting clinically relevant low back pain [1,2]. The design of eVAS employs the 10 cm scale that has been validated in peer-reviewed literature [1-5]. Its design is further informed by current research validating the reliability and accuracy of clinically relevant pain using visual analog scales through touchscreen devices [3-5]. References: [1] https://pubmed.ncbi.nlm.nih.gov/24384659/ [2] https://pubmed.ncbi.nlm.nih.gov/12592542/ [3] https://pubmed.ncbi.nlm.nih.gov/26769149/ [4] https://pubmed.ncbi.nlm.nih.gov/30211382/ [5] https://pubmed.ncbi.nlm.nih.gov/12237213/ Medical Advice Disclaimer: DISCLAIMER: EVAS DOES NOT PROVIDE MEDICAL ADVICE The Contents of the App is for data collection and informational purposes only. No material on this app is intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of your physician or other qualified health care provider with any questions you may have regarding a medical condition or treatment and before undertaking a new health care regimen or making any medical decisions, and never disregard professional medical advice or delay in seeking it because of your use of eVAS.
Verdict
The clearest difference is update cadence: eVAS at every 3 days against Feather Squadron's every 3 months. Feather Squadron's advantage is iOS requirement (9.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Feather Squadron ships an update every 3 months, eVAS every 3 days. The most recent releases landed on October 5, 2026 and October 13, 2026 respectively.
| Parameter | Feather Squadron | eVAS |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 3 days โ better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPad | iPad |
| Requires iOS | 9.0 โ better | 15.1 |
| Further details โ not scored | ||
| Size | 27 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Acoustic Pioneer | Ryan Tennant |
In-app purchases
Feather Squadron
No in-app purchases
eVAS
No in-app purchases
Questions
Is Feather Squadron free?
Is eVAS free?
Do Feather Squadron or eVAS have ads?
Which is updated more often, Feather Squadron or eVAS?
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