# Roofing Ventilation Calculator vs Par Order

The clearest difference is update cadence: Par Order at every 9 days against Roofing Ventilation Calculator's every 3 months. Roofing Ventilation Calculator's advantage is iOS requirement (13.0 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Roofing Ventilation Calculator ships an update every 3 months, Par Order every 9 days. The most recent releases landed on October 3, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Roofing Ventilation Calculator | Par Order |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (6 ratings)](https://appshunter.io/ios/app/roofing-ventilation-calculator/id1035643148/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | Free | — |
| Size | 34 MB | 0 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Compagnie de Saint-Gobain](https://appshunter.io/developer/543924473) | [Carlos Rodriguez](https://appshunter.io/developer/1849773265) |

## What reviewers say

### Roofing Ventilation Calculator

[App page](https://appshunter.io/ios/app/roofing-ventilation-calculator/id1035643148)

Calculate the necessary amount of ventilation products for an attic space. Input attic dimensions or square footage to receive results based on the NFA 1/300 rule for balanced ventilation.

**Highlights:** Attic dimension input, Square footage input, NFA 1/300 rule calculation, Ventilation product quantity determination, Balanced ventilation planning

**Features:** macOS Compatibility

**In-app purchases:** none


### Par Order

[App page](https://appshunter.io/ios/app/par-order/id6754718521)

**In-app purchases:** none


## Frequently asked questions

### Is Roofing Ventilation Calculator free?

Roofing Ventilation Calculator is free to download, with no in-app purchases.

### Is Par Order free?

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

### Do Roofing Ventilation Calculator or Par Order have ads?

Neither Roofing Ventilation Calculator nor Par Order shows ads.

### Which is updated more often, Roofing Ventilation Calculator or Par Order?

Roofing Ventilation Calculator ships an update every 3 months, and Par Order every 9 days. Most recently, Roofing Ventilation Calculator was updated on October 3, 2026 and Par Order on October 10, 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.*