
KoboToolbox
8.4#5 in survey softwareFrom $21 a monthFree planiOSWebAPI
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You want what its maker publishes above — check its page for the details.
Ona Data suits teams collecting field responses on Android devices or in web forms, including those who need offline collection, GPS or photo capture, or data review tools. It may also fit teams that need access controls or local hosting options for data requirements.