# Sequetur vs XXI

The clearest difference is price: XXI at Free against Sequetur's $2.99. XXI also leads on ratings volume (15 vs 1) and iOS requirement (11.0 vs 15.0). Sequetur's advantage is ads (none vs shown) and update cadence (every 6 months vs every 17 months). On rating, in-app purchases and device support there is nothing between them.

XXI is free to download; Sequetur costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Sequetur against 4.9 for XXI. That said, the two scores are not equally well evidenced: XXI has 15 ratings behind it against 1, so its average is the more settled of the two.

Sequetur ships an update every 6 months, XXI every 17 months. The most recent releases landed on September 23, 2026 and August 13, 2026 respectively.

## The numbers

| Metric | Sequetur | XXI |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sequetur/id884501258/reviews)** | [4.9 (15 ratings)](https://appshunter.io/ios/app/xxi-21-puzzle-game/id1082830282/reviews) |
| Number of ratings | 1 | **15** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 6 months** | Every 17 months |
| Monetization | Paid | **Ad-supported** |
| Size | 5 MB | 27 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kelly Technology Inc.](https://appshunter.io/developer/393931941) | [TMSOFT](https://appshunter.io/developer/288669797) |

## What reviewers say

### Sequetur

[App page](https://appshunter.io/ios/app/sequetur/id884501258)

Challenge your mind with number sequences. Earn points by solving puzzles, but beware of incorrect answers. Hints are available to help you find the solution.

**Highlights:** Number sequence puzzles, Point-based scoring, Penalty for wrong answers, Puzzle skipping option, Hints provided, Difficulty levels

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

**In-app purchases:** none


### XXI

[App page](https://appshunter.io/ios/app/xxi-21-puzzle-game/id1082830282)

This puzzle game challenges you to arrange numbered gems on a board so that each row and column sums to 21. Progress through 200 levels of increasing difficulty, utilizing a special gem that can be 1 or 11. Compete with others via leaderboards and share your achievements.

**Highlights:** 200 unique puzzles, Special gem mechanics, Game Center achievements, Leaderboard competition, Beautiful graphics and sound, Universal app support

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

**In-app purchases:** none


## Frequently asked questions

### Is Sequetur free?

Sequetur costs $2.99, with no in-app purchases.

### Is XXI free?

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

### Which has better reviews, Sequetur or XXI?

Sequetur is rated higher. Sequetur averages 5.0 out of 5 from 1 ratings, while XXI averages 4.9 from 15 ratings.

### Do Sequetur or XXI have ads?

XXI shows ads; Sequetur does not.

### Which is updated more often, Sequetur or XXI?

Sequetur ships an update every 6 months, and XXI every 17 months. Most recently, Sequetur was updated on September 23, 2026 and XXI on August 13, 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.*