# Horizon Detection vs Concrete Calculator Tools

The clearest difference is rating: Concrete Calculator Tools at 4.7 against Horizon Detection's 1.0. Concrete Calculator Tools also leads on ratings volume (51 vs 1). Horizon Detection's advantage is in-app purchases (none vs 4) and update cadence (fortnightly vs every 2 months). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. Concrete Calculator Tools sells 4 in-app purchases, starting at $3.99 per 7 days. Horizon Detection asks for nothing beyond the download.

Concrete Calculator Tools holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Concrete Calculator Tools has 51 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 0% and 0% positive.

Horizon Detection ships an update fortnightly, Concrete Calculator Tools every 2 months. The most recent releases landed on October 30, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Horizon Detection | Concrete Calculator Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/horizon-detection/id6511216202/reviews) | **[4.7 (51 ratings)](https://appshunter.io/ios/app/concrete-calculator-tools/id6741408557/reviews)** |
| Number of ratings | 1 | **51** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 35 MB | 39 MB |
| Requires iOS | **17.7.2** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [Peth Pty Ltd](https://appshunter.io/developer/662891650) |

## What reviewers say

### Horizon Detection

[App page](https://appshunter.io/ios/app/horizon-detection/id6511216202)

This utility app identifies and highlights horizontal lines within an image. It's designed for users who need to analyze visual data for straight horizontal elements.

**Highlights:** Detects horizontal lines, Highlights detected lines, Image analysis tool, Simple interface

**Features:** macOS Compatibility

**In-app purchases:** none


### Concrete Calculator Tools

[App page](https://appshunter.io/ios/app/concrete-calculator-tools/id6741408557)

This app simplifies concrete volume calculations for professionals and DIYers. It offers flexible unit support and a free rectangular slab calculator, with advanced features available via subscription.

**Highlights:** Flexible unit support (metric/imperial), Rectangular slab calculator (free), Circular slab calculator, Circular column calculator, Post hole calculator, Slab from area calculator

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro | $3.99 | per 7 days |
| Monthly Pro | $5.99 | per month |
| Annual Pro | $19.99 | per year |
| One-Time Purchase | $85.00 | one-time |


## Frequently asked questions

### Is Horizon Detection free?

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

### Is Concrete Calculator Tools free?

Concrete Calculator Tools is free to download, with in-app purchases available.

### Which has better reviews, Horizon Detection or Concrete Calculator Tools?

Concrete Calculator Tools is rated higher. Horizon Detection averages 1.0 out of 5 from 1 ratings, while Concrete Calculator Tools averages 4.7 from 51 ratings.

### Do Horizon Detection or Concrete Calculator Tools have ads?

Both Horizon Detection and Concrete Calculator Tools show ads.

### Which is updated more often, Horizon Detection or Concrete Calculator Tools?

Horizon Detection ships an update fortnightly, and Concrete Calculator Tools every 2 months. Most recently, Horizon Detection was updated on October 30, 2026 and Concrete Calculator Tools on November 4, 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.*