# Undertint — Mix the colour you see

> Mix the colour you see (iPhone/iPad app by Justin Stach.)

- Source: https://appshunter.io/ios/app/undertint/id6759327068 (this page in markdown: same URL + `.md`)
- Developer: [Justin Stach](https://appshunter.io/developer/1871703825)
- Category: Graphics & Design, Lifestyle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.6 · 9 MB
- Languages: American English
- Released: 2026-05-13
- Data updated: 2026-08-05
- User reviews in markdown: https://appshunter.io/ios/app/undertint/id6759327068/reviews.md

## What is Undertint?

Undertint helps watercolour painters answer one question: how do I mix that colour, with the paints I already have?

Point Undertint at a photo. The app simplifies the image into the colours you would actually need to paint, then gives you a mixing recipe for each one, drawn from your own palette. Recipes use Kubelka-Munk pigment mixing, the same maths colour scientists use to model how watercolour pigments combine on paper. The output is a recipe you can mix at the page, not a colour you can only see on a screen.

Everything happens on your device. Photos never leave your phone. Free to try. Pro unlocks multi-paint mixing recipes and bookmarking as a one-off purchase or a monthly subscription.

Features
• Photo simplification with adjustable detail. Pull the slider down for big colour shapes, up for finer control.
• Tap any region to see the colour identified in painterly terms and a Munsell reading.
• Mixing recipes from your own paints from a catalogue of over 100 and growing.
• Dilution gradients show how a colour shifts as you add water, so you can match the value as well as the hue.
• Save value studies to your photo library to use as on-easel references.
• Bookmark the recipe you'll mix for each colour, and Undertint will use it to prioritise coherent recipes.

Who Undertint is for
Watercolourists who want to spend less time second-guessing colour mixes and more time painting.
Beginners learning what their paints can do, and experienced painters who want a quick second opinion when matching a tricky reference colour.

What Undertint isn't
Undertint isn't a digital painting app. It doesn't replace mixing on your palette. It helps you decide and learn how to mix.

About brand names
Brand and product names referenced are trademarks of their respective owners, used only so you can identify your own paints. Undertint is independent of and not affiliated with any of them. 

Privacy
Undertint does not collect, transmit, or sell your data. No analytics, no advertising, no third-party SDKs, and no network requests except to Apple's App Store for purchases. Photos you import are processed on-device and never leave your phone.

Terms of use (EULA)
See: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Undertint Pro | $1.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Undertint Pro | $14.99 | one-time |



## Version history (last 4 releases)

### 1.2 — 2026-06-09

• Bookmark the recipe you'll actually mix for each colour. Your choice is saved for when you reopen a study.
• A bigger paint library, including the Van Gogh Pocket Box and more Daniel Smith and M. Graham colours.
• Unlock Pro your way: keep the one-off purchase, or dip your toe with a monthly subscription.
• Missing a paint? Let me know from inside the app.
• Refinements to recipe cards and general polish.

### 1.1.1 — 2026-05-14

Fixes a bug that could show Pro mixing recipes before unlocking.

### 1.1 — 2026-05-13

Adds Undertint Pro, a one-off unlock for two- and three-paint mix recipes that get a much closer match to the target colour. The free experience is unchanged: single-paint matches, photo simplification, and palette setup are all included as before.

### 1.0 — 2026-05-13

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-05.*