# STutor vs NinjaSudoku

The clearest difference is price: NinjaSudoku at Free against STutor's $0.99. STutor's advantage is iOS requirement (13.0 vs 15.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

NinjaSudoku is free to download; STutor costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

STutor ships an update every 28 months, NinjaSudoku every 52 months. The most recent releases landed on October 8, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | STutor | NinjaSudoku |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/stutor/id714298825/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 28 months** | Every 52 months |
| Monetization | Paid | — |
| Size | 2 MB | 1 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Robert Carlson](https://appshunter.io/developer/714298828) | [Compiled](https://appshunter.io/developer/520829733) |

## What reviewers say

### STutor

[App page](https://appshunter.io/ios/app/stutor/id714298825)

This app assists in solving Sudoku puzzles by offering three levels of hints and employing five logical solving strategies. It allows manual puzzle entry or input via an 81-character string, with options to save, recall, and manage puzzles. The app validates entries against its solution and displays possible numbers for incorrect moves.

**Highlights:** Three levels of hints, Five logical solving strategies, Manual puzzle entry, 81-character string input, Puzzle saving and management, Entry validation against solution, Display of possible numbers

**In-app purchases:** none


### NinjaSudoku

[App page](https://appshunter.io/ios/app/ninjasudoku/id1236311684)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is STutor free?

STutor costs $0.99, with no in-app purchases.

### Is NinjaSudoku free?

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

### Do STutor or NinjaSudoku have ads?

Neither STutor nor NinjaSudoku shows ads.

### Which is updated more often, STutor or NinjaSudoku?

STutor ships an update every 28 months, and NinjaSudoku every 52 months. Most recently, STutor was updated on October 8, 2026 and NinjaSudoku on September 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.*