# Boiler Calculator vs Flat Pattern

The clearest difference is update cadence: Flat Pattern at daily against Boiler Calculator's every 35 months. Flat Pattern also leads on iOS requirement (10.0 vs 12.0). Boiler Calculator's advantage is price ($3.99 vs $7.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

Boiler Calculator costs $3.99 and Flat Pattern $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Boiler Calculator ships an update every 35 months, Flat Pattern daily. The most recent releases landed on September 22, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Boiler Calculator | Flat Pattern |
| --- | --- | --- |
| Price | **$3.99** | $7.99 |
| Rating | — | **[1.0 (2 ratings)](https://appshunter.io/ios/app/flat-pattern/id1490125173/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 35 months | **Daily** |
| Monetization | Paid | Paid |
| Size | 2 MB | 64 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bhavinkumar Satashiya](https://appshunter.io/developer/1361485921) | [Imran Pinjara](https://appshunter.io/developer/1484488781) |

## What reviewers say

### Boiler Calculator

[App page](https://appshunter.io/ios/app/boiler-calculator-tracecalc/id1449806152)

This utility app helps boilermakers quickly calculate boiler facing areas and trace complex cylindrical curves. It simplifies intricate measurements, saving time and materials for professionals.

**Highlights:** Calculate boiler facing area, Trace cylindrical curves, Handle 90° intersections, Streamline complex measurements, Intuitive user interface, In-app guidance

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

**In-app purchases:** none


### Flat Pattern

[App page](https://appshunter.io/ios/app/flat-pattern/id1490125173)

This tool helps fabrication professionals create precise flat patterns for various shapes, minimizing fabrication time and increasing accuracy. It supports a wide range of complex geometries for industries like pressure vessels, piping, and heavy equipment.

**Highlights:** Fabrication layout for pipes and cones, Supports various pipe intersections, Calculates transitions between shapes, Generates patterns for pyramids and spheres, Includes dish end and screw flight layouts, Minimizes fabrication time and increases accuracy

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

**In-app purchases:** none


## Frequently asked questions

### Is Boiler Calculator free?

Boiler Calculator costs $3.99, with no in-app purchases.

### Is Flat Pattern free?

Flat Pattern costs $7.99, with no in-app purchases.

### Do Boiler Calculator or Flat Pattern have ads?

Neither Boiler Calculator nor Flat Pattern shows ads.

### Which is updated more often, Boiler Calculator or Flat Pattern?

Boiler Calculator ships an update every 35 months, and Flat Pattern daily. Most recently, Boiler Calculator was updated on September 22, 2026 and Flat Pattern on October 1, 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.*