mysurveylab.com allows for offline data collection with a mobile app available for devices with Android and iOS.
To use the mobile app :
NOTE. In order to connect to the mobile app you need to be online, so the app can authenticate you and download surveys from your account. Then you can disconnect and use the app offline.
To add mobile collector :
NOTE. For one survey you can add one mobile collector.
Mobile app supports the following question types :
Please remember that other question types (eg. matrix question, heat map, drag & drop) will not be displayed in the mobile app.
The application works on Android (4.1) and iOS (9.0) operating systems, or higher.
Option is available in Professional and Enterprise plan.