Zepto Product Personalizer

The app provides a relatively simple way to custmise products with options like file (image) upload , text editor, buttons etc and the creation of templates was easy. It also allows a live preview for the customers on your storefront with the preview in high resoloution even 300 dpi. It doe not yet have API integrations which would be ideal. That said the service provided is top notch and has a active custoemr support team to handle queries.