Testing the Undertint App While Painting a Strawberry Daifuku

I recently got an email from Justin, the developer behind an app called Undertint — and it genuinely charmed me. He built it for his wife, who is a watercolor artist struggling with color mixing ratios. I said I'd test it out, and naturally, I decided to do it by painting a strawberry daifuku. Because why not? The app is now out of beta and available in the App Store, and here's what I found.