# ICU vs Sequence

The clearest difference is in-app purchases: ICU at none against Sequence's 2. ICU also leads on iOS requirement (15.0 vs 17.6). Sequence's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Sequence sells 2 one-off in-app purchases. ICU asks for nothing beyond the download.

ICU ships an update every 2 months, Sequence every 3 months. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | ICU | Sequence |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (14 ratings)](https://appshunter.io/ios/app/sequence-a-memory-challenge/id1609878481/reviews)** |
| Number of ratings | — | **14** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | — | Free with in-app purchases |
| Size | 75 MB | 1 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Be Yourself Ventures Ltd.](https://appshunter.io/developer/1469881783) | [Dustin Wiens](https://appshunter.io/developer/1495273178) |

## What reviewers say

### ICU

[App page](https://appshunter.io/ios/app/icu-i-challenge-u/id1532722832)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sequence

[App page](https://appshunter.io/ios/app/sequence-a-memory-challenge/id1609878481)

Test your memory by tapping numbered tiles in the correct order. Choose from various difficulty levels, grid sizes, and game modes to challenge yourself. See how long you can last in the infinite mode.

**Highlights:** Memorize numbered tile sequences, Tap tiles in correct order, Multiple difficulty levels, Variable grid sizes, Sequential number mode, Non-sequential number mode, Multiples of 2 mode, Infinite mode

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Non-Consecutive Game | $0.99 | one-time |
| Multiples of 2 | $0.99 | one-time |


## Frequently asked questions

### Is ICU free?

ICU is free to download, with no in-app purchases.

### Is Sequence free?

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

### Do ICU or Sequence have ads?

ICU shows ads; Sequence does not.

### Which is updated more often, ICU or Sequence?

ICU ships an update every 2 months, and Sequence every 3 months. Most recently, ICU was updated on October 27, 2026 and Sequence on October 30, 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.*