# SumSudoku vs Einstein Challenge

The clearest difference is price: SumSudoku at Free against Einstein Challenge's $0.99. SumSudoku also leads on update cadence (every 5 months vs every 39 months) and iOS requirement (15.6 vs 17.0). Einstein Challenge's advantage is in-app purchases (none vs 10). On device support there is nothing between them.

SumSudoku is free to download; Einstein Challenge costs $0.99 up front. SumSudoku sells 10 one-off in-app purchases. Einstein Challenge asks for nothing beyond the download.

SumSudoku ships an update every 5 months, Einstein Challenge every 39 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | SumSudoku | Einstein Challenge |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.8 (815 ratings)](https://appshunter.io/ios/app/sumsudoku-killer-sudoku/id1259275580/reviews)** | — |
| Number of ratings | **815** | — |
| Positive reviews | 96.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | — |
| Update frequency | **Every 5 months** | Every 39 months |
| Monetization | Free with in-app purchases | — |
| Size | 11 MB | 9 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Conceptis Ltd.](https://appshunter.io/developer/479420055) | [Joao Silva](https://appshunter.io/developer/1293675690) |

## What reviewers say

### SumSudoku

[App page](https://appshunter.io/ios/app/sumsudoku-killer-sudoku/id1259275580)

This app offers a logic puzzle experience combining Sudoku and Kakuro elements. Solve grids by filling numbers 1-9, ensuring each appears once per row, column, and box, while also meeting area sum clues. Features include hints, pencilmarks, and progress previews.

**Highlights:** Killer Sudoku puzzles, Kakuro-style sum clues, Logic and calculation based, Hints and pencilmarks, Progress previews, Weekly bonus puzzles, Multiple difficulty levels

**Features:** Family Sharing, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Easy 1 | $0.99 | one-time |
| Medium 1 | $1.99 | one-time |
| Hard 1 | $1.99 | one-time |
| Killer 1 | $1.99 | one-time |
| Medium 2 | $1.99 | one-time |
| Hard 2 | $1.99 | one-time |
| Killer 2 | $1.99 | one-time |
| Hard 3 | $1.99 | one-time |
| Killer 3 | $1.99 | one-time |
| Hard 4 | $1.99 | one-time |

**What reviewers like**

- 👍 Challenging and fun puzzles
- 🚀 Intuitive interface and controls
- 🔒 No ads or in-app purchases
- 💡 Variety of difficulty levels
- 👍 Helps keep the mind sharp

**What reviewers complain about**

- 🐛 Occasional crashes or freezes
- 💡 Difficulty levels not always consistent
- 💡 Lack of customization options (colors, etc.)

**Reported bugs**

- Some puzzles have incorrect sums or repeated numbers
- Autofill feature doesn't always work as expected

**Requested features**

- Add ability to select difficulty level for weekly bonus puzzles
- Implement a 'dark mode' option
- Allow users to cross out/eliminate number possibilities
- Add a 'one-tap' feature to fill in all 9 numbers in a cell


### Einstein Challenge

[App page](https://appshunter.io/ios/app/einstein-challenge/id1293675691)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SumSudoku free?

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

### Is Einstein Challenge free?

Einstein Challenge costs $0.99, with no in-app purchases.

### Which is updated more often, SumSudoku or Einstein Challenge?

SumSudoku ships an update every 5 months, and Einstein Challenge every 39 months. Most recently, SumSudoku was updated on November 2, 2026 and Einstein Challenge on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*