Unbelievable but. …
Leaving 5 stars in hopes developer will be kind and fix this. App can really be a miracle if this is done.
Response from developer
Thanks! In the latest update you can remove the watermark with an in app purchase

Visualize yourself with blonde hair using this app. It allows for detailed adjustments to hair color, age, smile, and head orientation. Experiment with different looks easily.
1.3
May 11, 2022
1) Sliders instead of increment/decrement buttons 2) Display both input photo and blondified photo 3) Added an in-app purchase to remove the watermark 4) Photo exported to library
More$0.99
Remove Watermark and Export
Removes watermark and saves photo to library
Thanks! In the latest update you can remove the watermark with an in app purchase
Blondify uses your device's camera or existing photos to apply a virtual blonde hair color overlay. You can then fine-tune the look with various adjustment tools.
Yes, Blondify allows you to adjust your apparent age, modify your smile, and control the rotation of your head for a more realistic visualization.
Blondify is available for iPhone, iPad, and iPod devices.
Blondify has an age rating of 4+, making it suitable for a wide range of users.
The latest version of Blondify is 1.3, and it was last updated on May 11, 2022. Updates typically bring improvements and new features.
Blondify is free to download and use, but it does offer in-app purchases for additional features or content.
Based on its 4.0-star rating from 4 reviews, users likely appreciate the ability to easily visualize different hair colors and make facial adjustments.
No, Blondify does not contain advertisements, providing an uninterrupted user experience.