Project Twenty21 at App Store analyse

App power index: 100 (based on ranks around App Stores today)
Health & Fitness
Developer: L2S2 Ltd
Price: 0 free
Current version: 2.4.2, last update: 10 months ago
First release : 14 Feb 2023
App size: 136.86 Mb
4.6 ( 7456 ratings )
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Estimation application downloads and cost

> 2.2k
Monthly downloads
~ $ 900
Estimation App Cost


As a participant in the registry, you will be asked to complete a few questionnaires once every 3 months for up to four years.

These questionnaires will take approximately 10 minutes to complete. All patients will need to complete one condition-specific questionnaire depending on their primary condition and up to 5 general questionnaires.

Users should seek a doctor’s / clinicians advice in addition to using this app and before making any medical decisions.


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Available in countries
Country Price
UK free
Available for devices
iPhone5s, iPadAir, iPadAirCellular, iPadMiniRetina, iPadMiniRetinaCellular, iPhone6, iPhone6Plus, iPadAir2, iPadAir2Cellular, iPadMini3, iPadMini3Cellular, iPodTouchSixthGen, iPhone6s, iPhone6sPlus, iPadMini4, iPadMini4Cellular, iPadPro, iPadProCellular, iPadPro97, iPadPro97Cellular, iPhoneSE, iPhone7, iPhone7Plus, iPad611, iPad612, iPad71, iPad72, iPad73, iPad74, iPhone8, iPhone8Plus, iPhoneX, iPad75, iPad76, iPhoneXS, iPhoneXSMax, iPhoneXR, iPad812, iPad834, iPad856, iPad878, iPadMini5, iPadMini5Cellular, iPadAir3, iPadAir3Cellular, iPodTouchSeventhGen, iPhone11, iPhone11Pro, iPadSeventhGen, iPadSeventhGenCellular, iPhone11ProMax, iPhoneSESecondGen, iPadProSecondGen, iPadProSecondGenCellular, iPadProFourthGen, iPadProFourthGenCellular,