# UCAT vs Kairos

The clearest difference is update cadence: UCAT at every 2 weeks against Kairos's every 4 months. UCAT also leads on iOS requirement (15.6 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. UCAT sells 1 in-app purchase, starting at $2.99 per 7 days and Kairos sells 3 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

UCAT ships an update every 2 weeks, Kairos every 4 months. Both last shipped on October 31, 2026.

## The numbers

| Metric | UCAT | Kairos |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 4 months |
| Size | 14 MB | 5 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [George Lee](https://appshunter.io/developer/1295254226) | [Branko Borota](https://appshunter.io/developer/1228658475) |

## What reviewers say

### UCAT

[App page](https://appshunter.io/ios/app/ucat/id6777990141)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly subscription | $2.99 | per 7 days |


### Kairos

[App page](https://appshunter.io/ios/app/kairos-ucat-prep-and-mocks/id6785911218)

**Features:** Family Sharing, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $7.99 | per month |
| 3-Month Prep Block | $17.99 | per 3 months |
| Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is UCAT free?

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

### Is Kairos free?

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

### Do UCAT or Kairos have ads?

Neither UCAT nor Kairos shows ads.

### Which is updated more often, UCAT or Kairos?

UCAT ships an update every 2 weeks, and Kairos every 4 months. Most recently, UCAT was updated on October 31, 2026 and Kairos on October 31, 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.*