The Localytics Previewer (available for iOS on the App Store Here) lets you scan test mode codes to preview your push or in-app campaigns in your app.
To use the Previewer, you’ll need to be sure your app is integrated for Test Mode. Once that’s set up, any time you build a campaign, you can click on the “Test on Device” button on the final screen of the campaign builder to put your app into test mode and bring up the test mode code:
This will display a QR code you can scan by opening the Previewer app and pointing the camera at the code.
The Previewer also lets you confirm that your app is integrated for push via Rapid Push Verification.