# Flat Metal Patterns vs Circle & Diameter Calculator

The clearest difference is rating: Circle & Diameter Calculator at 5.0 against Flat Metal Patterns's 4.4. Circle & Diameter Calculator also leads on in-app purchases (none vs 3) and review sentiment (100% vs 83%). Flat Metal Patterns's advantage is update cadence (every 5 weeks vs every 20 months) and ratings volume (27 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. Flat Metal Patterns sells 3 in-app purchases, starting at $7.99 per month. Circle & Diameter Calculator asks for nothing beyond the download.

Circle & Diameter Calculator holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Flat Metal Patterns has 27 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 83% of Flat Metal Patterns's written reviews are positive against 100% of Circle & Diameter Calculator's.

Flat Metal Patterns ships an update every 5 weeks, Circle & Diameter Calculator every 20 months. The most recent releases landed on November 3, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Flat Metal Patterns | Circle & Diameter Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (27 ratings)](https://appshunter.io/ios/app/flat-metal-patterns/id1481867517/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/circle-and-diameter-calculator/id6463205574/reviews)** |
| Number of ratings | **27** | 1 |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 20 months |
| Monetization | Freemium | **Free** |
| Size | 135 MB | 10 MB |
| Requires iOS | **13.0** | 15 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ignacio Renteria-Molina](https://appshunter.io/developer/1481867516) | [Krzysztof Gwiazda](https://appshunter.io/developer/1546740383) |

## What reviewers say

### Flat Metal Patterns

[App page](https://appshunter.io/ios/app/flat-metal-patterns/id1481867517)

This app simplifies metal pattern creation with precise mathematical calculations, saving time and reducing errors compared to manual methods. It offers various pattern types, unit conversions, and smart calculation features for both experienced professionals and beginners.

**Highlights:** Automated pattern calculation, 20+ different pattern types, Diameter-Circumference conversion, Pipe and insulation reference tables, Smart calculator for fractions/decimals, Scale feature for large patterns

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One month subscription | $7.99 | per month |
| 3 months subscription | $19.99 | per 3 months |
| 6 month subscription | $38.99 | per 6 months |


### Circle & Diameter Calculator

[App page](https://appshunter.io/ios/app/circle-and-diameter-calculator/id6463205574)

Instantly calculate a circle's diameter, radius, circumference, and area. This tool is perfect for students, DIYers, and anyone needing quick, accurate circular measurements. It features an intuitive interface with automatic result updates.

**Highlights:** Calculate radius, diameter, circumference, and area, Instant calculations with automatic result updates, Input any known value to find others, Accurate geometry formulas using Pi, Support for decimal numbers and international input, Simple and intuitive interface

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

**In-app purchases:** none


## Frequently asked questions

### Is Flat Metal Patterns free?

Flat Metal Patterns is free to download, with in-app purchases available.

### Is Circle & Diameter Calculator free?

Circle & Diameter Calculator is free to download, with no in-app purchases.

### Which has better reviews, Flat Metal Patterns or Circle & Diameter Calculator?

Circle & Diameter Calculator is rated higher. Flat Metal Patterns averages 4.4 out of 5 from 27 ratings, while Circle & Diameter Calculator averages 5.0 from 1 ratings.

### Do Flat Metal Patterns or Circle & Diameter Calculator have ads?

Neither Flat Metal Patterns nor Circle & Diameter Calculator shows ads.

### Which is updated more often, Flat Metal Patterns or Circle & Diameter Calculator?

Flat Metal Patterns ships an update every 5 weeks, and Circle & Diameter Calculator every 20 months. Most recently, Flat Metal Patterns was updated on November 3, 2026 and Circle & Diameter Calculator on November 12, 2026.

---

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