Hello @EmaC_io,Have you got your solution? Though it’s been a long time still I’m leaving this reply as it can be helpful for others too. As you’ve been searching for an app that dynamically charges per each letter then you can try the Inkybay app.
This app provides vast customization features. For all the customization options, you can assign prices easily. Customers can see real-time pricing while customizing the product. When your customer adds any design or makes customization like adding text then the assigned price will be added with the base price instantly. With this app, you can assign a price per character of a text. So, when the customer enters any letter, the price will be updated according to that.
Also, customers can add graphics, upload images, and customize texts in various ways like changing color, fonts, rotating, etc. Customers will have a live preview while adding designs to a product. You can get the custom order file through this app.
According to the features, it provides different packages with different prices so that you can use this app according to your budget also.
This app offers 21 days of the trial so you’ll get enough time to decide if this app suits your business or not.