# Head Model Studio vs ka

The clearest difference is update cadence: ka at weekly against Head Model Studio's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Head Model Studio sells 4 in-app purchases, starting at $9.00 per month and ka sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Head Model Studio ships an update monthly, ka weekly. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Head Model Studio | ka |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (2.5K ratings)](https://appshunter.io/ios/app/head-model-studio-art-study/id1527028690/reviews)** | — |
| Number of ratings | **2.5K** | — |
| Positive reviews | 76.4% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Freemium | — |
| Size | 2.2 GB | 157 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Wes Castain](https://appshunter.io/developer/1527028692) | [Amazing LLC](https://appshunter.io/developer/1725259494) |

## What reviewers say

### Head Model Studio

[App page](https://appshunter.io/ios/app/head-model-studio-art-study/id1527028690)

Master portrait drawing with detailed 3D head models. Study facial planes and geometry with customizable lighting and rendering options. Perfect for artists looking to elevate their sketching skills.

**Highlights:** Detailed 3D head models, Plane and geometry study, Customizable lighting (environmental & studio), Adjustable rendering (edge outline, shininess), Pre-made practice scenes, Zoom, tilt, and rotate controls

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Access | $9.00 | per month |
| 1 Year Access | $16.00 | per year |
| 1 Year Access | $23.00 | one-time |
| Lifetime Access | $50.00 | one-time |

**What reviewers like**

- 🎨 Excellent reference tool for artists
- 🔍 Helpful for understanding head anatomy and planes
- 🔧 Customizable lighting and model features
- 💰 Reasonable subscription pricing

**What reviewers complain about**

- 💰 Premium features locked behind paywall
- 🔒 Lack of free trial to test premium content
- 🔧 Limited customization options for free users
- 🐛 Occasional technical issues with lighting and model adjustments

**Reported bugs**

- Sudden loss of model functionality after updates
- Overheating issues on some devices

**Requested features**

- Add female Loomis head models
- Expand customization options for paid users
- Implement full-body reference models
- Provide option for one-time lifetime purchase


### ka

[App page](https://appshunter.io/ios/app/ka-ka/id6772021973)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Yearly | $3.99 | per year |
| Lifetime | $8.99 | one-time |


## Frequently asked questions

### Is Head Model Studio free?

Head Model Studio is free to download, with in-app purchases available.

### Is ka free?

ka is free to download, with in-app purchases available.

### Do Head Model Studio or ka have ads?

Neither Head Model Studio nor ka shows ads.

### Which is updated more often, Head Model Studio or ka?

Head Model Studio ships an update monthly, and ka weekly. Most recently, Head Model Studio was updated on October 30, 2026 and ka on October 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*