# Str8ts Solver vs Futoshiki Mastermind

The clearest difference is price: Futoshiki Mastermind at Free against Str8ts Solver's $2.99. Futoshiki Mastermind also leads on update cadence (every 10 days vs every 17 months). Str8ts Solver's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

Futoshiki Mastermind is free to download; Str8ts Solver costs $2.99 up front. Futoshiki Mastermind sells 1 one-off in-app purchase. Str8ts Solver asks for nothing beyond the download.

Str8ts Solver ships an update every 17 months, Futoshiki Mastermind every 10 days. The most recent releases landed on October 19, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Str8ts Solver | Futoshiki Mastermind |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 17 months | **Every 10 days** |
| Monetization | Paid | — |
| Size | 2 MB | 17 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Th. Wolf](https://appshunter.io/developer/1440178074) | [Robin Dufour](https://appshunter.io/developer/1819249965) |

## What reviewers say

### Str8ts Solver

[App page](https://appshunter.io/ios/app/str8ts-solver/id1452058653)

Solve logic puzzles similar to Sudoku by filling grids with numbers 1-9. Offers daily new puzzles of varying difficulty, an integrated solver for hints, and the ability to manually input or import puzzles.

**Highlights:** Daily new puzzles, Multiple difficulty levels, Integrated solver, Manual puzzle entry, Text format import

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

**In-app purchases:** none


### Futoshiki Mastermind

[App page](https://appshunter.io/ios/app/futoshiki-mastermind/id6751863249)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Futoshiki Premium | $1.99 | one-time |


## Frequently asked questions

### Is Str8ts Solver free?

Str8ts Solver costs $2.99, with no in-app purchases.

### Is Futoshiki Mastermind free?

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

### Do Str8ts Solver or Futoshiki Mastermind have ads?

Futoshiki Mastermind shows ads; Str8ts Solver does not.

### Which is updated more often, Str8ts Solver or Futoshiki Mastermind?

Str8ts Solver ships an update every 17 months, and Futoshiki Mastermind every 10 days. Most recently, Str8ts Solver was updated on October 19, 2026 and Futoshiki Mastermind on September 8, 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.*