# FocusGrid vs Star Fort Builder

The clearest difference is in-app purchases: Star Fort Builder at none against FocusGrid's 1. Star Fort Builder also leads on update cadence (every 9 days vs every 3 months) and iOS requirement (15.1 vs 17.6). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. FocusGrid sells 1 one-off in-app purchase. Star Fort Builder asks for nothing beyond the download.

FocusGrid ships an update every 3 months, Star Fort Builder every 9 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | FocusGrid | Star Fort Builder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/star-fort-builder/id6795415904/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | Free | Free |
| Size | 7 MB | 381 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [华芳 张](https://appshunter.io/developer/586041482) | [Felicity Enterprises LLC](https://appshunter.io/developer/1883166758) |

## What reviewers say

### FocusGrid

[App page](https://appshunter.io/ios/app/focusgrid-schulte-table/id6759941005)

This minimalist brain training game helps improve attention, speed, and concentration by tapping numbers in ascending order as quickly as possible. It features a daily goal system, streak tracking, and performance monitoring to help users see measurable improvement over time.

**Highlights:** Improve attention and concentration, Tap numbers in order quickly, Daily goal system, Track streaks and performance, Multiple grid sizes, Distraction-free design

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FocusGrid Pro | $2.99 | one-time |


### Star Fort Builder

[App page](https://appshunter.io/ios/app/star-fort-builder/id6795415904)

Explore a comprehensive reference and design system for historical star forts. Browse detailed information on 104 documented fortifications and design your own using classic military engineering principles.

**Highlights:** 104 historical star fort profiles, GPS coordinates and measurements, Aerial photography, Design your own star forts, Mathematical design systems (Vauban, Coehoorn)

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

**In-app purchases:** none


## Frequently asked questions

### Is FocusGrid free?

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

### Is Star Fort Builder free?

Star Fort Builder is free to download, with no in-app purchases.

### Do FocusGrid or Star Fort Builder have ads?

Neither FocusGrid nor Star Fort Builder shows ads.

### Which is updated more often, FocusGrid or Star Fort Builder?

FocusGrid ships an update every 3 months, and Star Fort Builder every 9 days. Most recently, FocusGrid was updated on October 31, 2026 and Star Fort Builder on October 31, 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.*