Flutter 5.+ migration guide

Upgrading version

Increase the dependency version in your prodspec.yaml file to upgrade your Qonversion SDK to the latest

  qonversion_flutter: ^5.0.0


Qonversion Flutter SDK 5 contains significant changes in how the library is initialized. We are moving from a static class approach to an instance-based one. Before, you initialized Qonversion using the launch call:

Qonversion.launch('projectKey', isObserveMode: true);

Now, instead, you should create a QonversionConfig object using QonversionConfigBuilder and provide it to the initialization method as follows:

final config = new QonversionConfigBuilder(

Note that instead of providing the observeMode flag to the launch call, you should provide a concrete value from the QLaunchMode enum, depending on which mode you use Qonversion. Also, we've renamed our modes to make them more transparent for users:

  • "Observe" mode becomes "Analytics" mode,
  • "Infrastructure" mode becomes "Subscription Management" mode.

After the initialization, you can access the Qonversion instance whenever you want as follows:


So you should replace all your Qonversion calls with the construction above.

Also, if you were using Qonversion.setDebugMode() for testing purposes, you should now call the setEnvironment(QEnvironment.sandbox) method of the QonversionConfigBuilder.

As no launch method is available anymore, you won't get QLaunchResult as a result. The good news is that there are analogues for all the fields you might have been using from there:

  • for uid, call userInfo() and get the QUser.qonversionId from the result,
  • for products call products(),
  • for offerings call offerings(),
  • for permissions, call checkEntitlements().


We are on the way to renaming permissions to entitlements as this naming suits more what it is used for. So, the following objects and methods were renamed in this release:

Version <4Version 4+

The QEntitlement class contains the same information as the QPermission with a renaming of the permissionId field - now it's named simply id.

  • There is no setPermissionsCacheLifetime method in Qonversion. You should provide QEntitlementsCacheLifetime to QonversionConfigBuilder during the initialization using the setEntitlementsCacheLifetime method.
final config = new QonversionConfigBuilder(

Automation changes

We've also changed the way the Automations is used. As in Qonversion, you should use Automations via the shared instance. On the first access, it will be initialized and returned. Then the initialized instance will be used.


You should access the shared instance of Automations strictly after you initialize Qonversion, else an exception will be thrown.

final config = new QonversionConfigBuilder(

Also, the methods for working with push notifications were moved from Qonversion to Automations, so if you were using the following methods:

  • setNotificationsToken,
  • handleNotification,
  • getNotificationCustomPayload,
    make sure to make calls from the Automations instance instead of the Qonversion one.

Rest of the changes

Along with the changes described above, there are several technical improvements and other changes in the new major release:

  • all the internal classes were moved to the internal package, and DTO classes were moved to the dto package to make the library file structure more readable;
  • the deprecated methods resetUser and setUserId were removed.
    resetUser was deprecated for a long time, and it did nothing, so there is nothing to replace this call with, remove the call if you were still using it for some reason. setUserId should be replaced with the setProperty call with QUserProperties.customUserId parameter;
  • added the new method userInfo, which returns the information about the current Qonversion user. Now it contains internal Qonversion and identity identifiers. The user info may be extended in future releases;
  • added new enum values - QOfferingTag.Unknown and QTrialDuration.Unknown, which are used when parsing fails;
  • facebookAttribution and advertisingId values were added to the QUserProperty enum;
  • native modules' error codes were refactored - now clear textual error codes are provided.
  • the following methods and classes renaming took place:
Old nameNew name