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SurveyCTO is a "mobile-first" platform, built initially for Android devices, then later extended to support web and iOS. Each target platform is different, and so not every SurveyCTO feature works equally well everywhere. When designing your forms, therefore, you'll want to factor in any limitations that might affect your chosen target platforms.

Following is a quick summary of features with less than complete support. (If a feature isn't listed here, it's supported everywhere!)

Feature	Web	Android	iOS
geopoint fields	limited support 1		limited support 2
geoshape fields
geotrace fields
barcode fields
image fields	limited support 3
deviceid fields
subscriberid fields
simserial fields
phonenumber fields
audio audit fields
speed violations audit fields
sensor_statistic fields
sensor_stream fields
Ability to act as the default phone app
phone-call-log() function
phone-call-duration() function
collect-is-phone-app() function
Form shortcuts on device home screen
Integration with external apps
Local WiFi sync
Display density setting
Copying device settings
Uploading default device configurations
Debug mode
Reload submission with updated form definition
Sending crash reports
Supports requiring a device lock screen
App passcode
Public app storage
Quick setup

¹ geopoint on web: no support for background appearance or offline map tiles
² geopoint on iOS: no support for offline map tiles
³ image on web: no support for annotate, draw, or signature appearances

Test wherever you will deploy

Though it's most convenient to do most of your form testing on the web, you'll definitely want to test your final forms on all target devices, before deploying them for data-collection.

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