# Subtract One vs Sudoku with Solver

The clearest difference is in-app purchases: Subtract One at none against Sudoku with Solver's 1. Subtract One also leads on iOS requirement (12.0 vs 15.0). Sudoku with Solver's advantage is update cadence (monthly vs every 30 months). On price, ads and device support there is nothing between them.

Both are free to download. Sudoku with Solver sells 1 one-off in-app purchase. Subtract One asks for nothing beyond the download.

Subtract One ships an update every 30 months, Sudoku with Solver monthly. The most recent releases landed on November 1, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Subtract One | Sudoku with Solver |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 30 months | **Monthly** |
| Size | 9 MB | 137 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Duo Pisceses, Inc.](https://appshunter.io/developer/850707063) | [NUKTEDAN LTD](https://appshunter.io/developer/1528231868) |

## What reviewers say

### Subtract One

[App page](https://appshunter.io/ios/app/subtract-one/id1506850034)

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

**In-app purchases:** none


### Sudoku with Solver

[App page](https://appshunter.io/ios/app/sudoku-with-solver/id6761395053)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Pack | $6.99 | one-time |


## Frequently asked questions

### Is Subtract One free?

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

### Is Sudoku with Solver free?

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

### Do Subtract One or Sudoku with Solver have ads?

Neither Subtract One nor Sudoku with Solver shows ads.

### Which is updated more often, Subtract One or Sudoku with Solver?

Subtract One ships an update every 30 months, and Sudoku with Solver monthly. Most recently, Subtract One was updated on November 1, 2026 and Sudoku with Solver on October 25, 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.*