Sudoku vs Quiet Letters
Price, ratings, monetisation and update history for both games, side by side โ with what reviewers say about each.
Sudoku
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Enjoy a little problem-solving on your commute, on a trip, or during a daily break with Sudoku - Notes Games. Play classic 9ร9 number puzzles offline, with a cute puppy for company. โข Pick easy grids for a relaxed session or hard challenges when you want to think a little longer. Choose a difficulty that suits you, from beginner to experienced player. โข Keep track of possible numbers with notes and pencil marks, then use logic to work out your next move. Each puzzle you solve earns paws you can use to collect dog avatars. Finish a grid, enjoy the achievement, and work toward the next addition to your collection.
Quiet Letters
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Quiet Letters is a calm word-puzzle game. Each round you have a fixed number of guesses to find the hidden word. Tiles light up to tell you which letters belong, which are misplaced, and which are out. No timer, no streak penalty, no noise โ just letters and time to think. Three modes: โข Mini โ 4 letters, 5 guesses. A short break. โข Classic โ 5 letters, 6 guesses. The puzzle you know. โข Wide โ 6 letters, 7 guesses. A slower read. Each mode plays Daily (one shared puzzle per day) or Practice (unlimited rolls), with an optional Hard mode that locks in revealed letters. Seven languages, each with its own keyboard and word list: English, French, Spanish, German, Italian, Portuguese, Dutch. Five themes โ Light, Dark, Paper, Dusk, and a colour-blind-friendly Accessible palette โ plus shape marks on every tile so the game stays readable for every kind of vision. Soft ambient music and gentle haptics. Every sound has a tap-mute on the Home screen, no settings dive needed. An optional daily reminder nudges you back at the time you choose. No ads. No tracking. No accounts. Your stats live on this device only.
Screenshots
Verdict
The clearest difference is in-app purchases: Quiet Letters at none against Sudoku's 2. Quiet Letters also leads on ads (none vs shown). Sudoku's advantage is update cadence (every 3 days vs every 3 weeks). On price, device support and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Sudoku sells 2 one-off in-app purchases. Quiet Letters asks for nothing beyond the download.
Sudoku ships an update every 3 days, Quiet Letters every 3 weeks. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.
| Parameter | Sudoku | Quiet Letters |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 days โ better | Every 3 weeks |
| Ads | Yes | No โ better |
| In-app purchases | Yes | No โ better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 โ better | 17.0 |
| Further details โ not scored | ||
| Size | 147 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | KUO CHENG-YEN | Laurent Chouinard |
In-app purchases
Sudoku
- bone$0.99
- Unlock perks$2.99
Quiet Letters
No in-app purchases
Questions
Is Sudoku free?
Is Quiet Letters free?
Do Sudoku or Quiet Letters have ads?
Which is updated more often, Sudoku or Quiet Letters?
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