Sequetur vs XXI
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Sequetur
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.
- Number sequence puzzles
- Point-based scoring
- Penalty for wrong answers
- Puzzle skipping option
- Hints provided
- Difficulty levels
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Like having fun with numbers? Sequetur challenges you to complete a series of number sequences and awards points based on the difficulty of each puzzle. Be careful, entering the wrong answer will result in a deduction of a quarter of the puzzle points from your total, but you can skip any puzzle you find too difficult. Hints are provided by showing the number of digits in the correct answer, and presenting 5 digits from which the answer is constructed.
XXI
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.
- 200 unique puzzles
- Special gem mechanics
- Game Center achievements
- Leaderboard competition
- Beautiful graphics and sound
- Universal app support
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XXI puzzles require a sum of 21 in every row and column. Move the gems around on the board until a solution is found. All gems have a unique numerical value, but watch out for the special gem that can be either a 1 or 11. Puzzles get harder as you progress your way through all 200 levels. Can you become a XXI champion? FEATURES - 200 Unique & Challenging Puzzles - Game Center Achievements (V, X, L, C, CC) - Game Center Leaderboard for Highest Level - Beautiful Music, Sounds, and Retina Graphics - Universal App looks Great on iPhone and iPad - Share Solution Photos with Friends Thanks for playing XXI by TMSOFT and good luck! Website: https://www.tmsoft.com/xxi/
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Sequetur | XXI |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | 4.9 (15 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 15 — better |
| Update frequency | Every 6 months — better | Every 17 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Kelly Technology Inc. | TMSOFT |
Customer experience
Sequetur
XXI
In-app purchases
Sequetur
No in-app purchases
XXI
No in-app purchases
