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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!)

geopoint fieldsno support for background appearance or offline map tilesno support for offline map tiles
geoshape fields
geotrace fields
barcode fields
image fieldsno support for annotate, draw, or signature appearances
deviceid fields
subscriberid fields
simserial fields
phonenumber fields
audio audit fields
speed violations audit fields
sensor_statistic fields
sensor_stream fields
HTML formatting in field labels
Form shortcuts on device home screen
Reload submission with updated form definition
Integration with external apps
Local WiFi sync
Copying device settings
Sending crash reports
Debug mode

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.
** SurveyCTO Collect on iOS is still in an early preview release. Some features are not yet supported, and we are updating the app frequently as issues are discovered and resolved. Please email to report any problems that you discover. Thank you!
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