Yes, in addition to Fabapp's plans, there will be an additional cost to publish your app in stores.
On Google Play, it is $ 25 to create your developer account paid directly to Google. We remind you that on Google Play, you can update your app yourself, without any other cost.
In the App Store, Apple store, 99 dollars are paid to Apple itself per year to activate your Apple developer account . Remember that on the App Store, our team sends the app to your activated developer account and then you submit the app for review by Apple. The app will only be published on the App Store after it has been approved by Apple's reviewer.
To publish the app on the App store, you need to subscribe to the Pro Plan.
The Plan Essential allows you to publish the app only on Google Play.