# Flat Metal Patterns vs O

The clearest difference is in-app purchases: O at none against Flat Metal Patterns's 3. O also leads on update cadence (every 2 weeks vs every 5 weeks). Flat Metal Patterns's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

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

Flat Metal Patterns ships an update every 5 weeks, O every 2 weeks. The most recent releases landed on September 16, 2026 and December 23, 2025 respectively.

## The numbers

| Metric | Flat Metal Patterns | O |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (25 ratings)](https://appshunter.io/ios/app/flat-metal-patterns/id1481867517/reviews)** | — |
| Number of ratings | **25** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Monetization | Freemium | — |
| Size | 135 MB | 52 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ignacio Renteria-Molina](https://appshunter.io/developer/1481867516) | [O-Pitblast, Lda.](https://appshunter.io/developer/1190650181) |

## 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 |


### O

[App page](https://appshunter.io/ios/app/o/id1645853605)

**Features:** macOS Compatibility

**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 O free?

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

### Do Flat Metal Patterns or O have ads?

O shows ads; Flat Metal Patterns does not.

### Which is updated more often, Flat Metal Patterns or O?

Flat Metal Patterns ships an update every 5 weeks, and O every 2 weeks. Most recently, Flat Metal Patterns was updated on September 16, 2026 and O on December 23, 2025.

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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.*