# HVAC Pipe Sizer vs Graph Paper

The clearest difference is review sentiment: HVAC Pipe Sizer at 80% against Graph Paper's 25%. HVAC Pipe Sizer also leads on rating (5.0 vs 1.0) and chart position (#180 vs unranked). Graph Paper's advantage is update cadence (every 5 weeks vs every 12 months) and price ($3.99 vs $7.99). On ads and in-app purchases there is nothing between them.

HVAC Pipe Sizer costs $7.99 and Graph Paper $3.99 up front. HVAC Pipe Sizer sells 1 one-off in-app purchase and Graph Paper sells 8 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

HVAC Pipe Sizer holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: Graph Paper has 8 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 80% of HVAC Pipe Sizer's written reviews are positive against 25% of Graph Paper's.

HVAC Pipe Sizer ships an update every 12 months, Graph Paper every 5 weeks. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer | Graph Paper |
| --- | --- | --- |
| Price | $7.99 | **$3.99** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-plus/id342239204/reviews)** | [1.0 (8 ratings)](https://appshunter.io/ios/app/graph-paper/id592051544/reviews) |
| Number of ratings | 1 | **8** |
| Positive reviews | **80.0% of reviews** | 24.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 5 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#180** | — |
| Size | 18 MB | 6 MB |
| Requires iOS | 15.6 | **9.1** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Adam McElhaney](https://appshunter.io/developer/298654663) |

## What reviewers say

### HVAC Pipe Sizer

[App page](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-plus/id342239204)

**Currently charting:** #180 Top Paid · Productivity (US App Store)

Calculate gas piping systems for low and high pressure. Input flow, pressure, or diameter to find pipe sizes, velocity, and equivalent lengths. Supports English and metric units, with extensive pipe fitting data.

**Highlights:** Low and high pressure gas pipe sizing, Calculate flow, pressure drop, diameter, and velocity, Universal app for iPhone and iPad, English and metric unit support, Built-in pipe fitting equivalent length tables, Slider controls for quick adjustments

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


### Graph Paper

[App page](https://appshunter.io/ios/app/graph-paper/id592051544)

This app allows users to create digital graph paper for various purposes, from mapping game worlds to designing crafts. It offers drawing tools, text options, and different paper styles, with saving and export capabilities.

**Highlights:** Line weight and multiple colors, Square and circle shapes, Add text with various fonts, Resizable and isometric grids, Save, export to PDF, and print, Line snap and ortho modes

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Color Pack - Khaki | $0.99 | one-time |
| Color Pack - Gold | $0.99 | one-time |
| Color Pack - Orange | $0.99 | one-time |
| Color Pack - Green | $0.99 | one-time |
| Color Pack - More Blue | $0.99 | one-time |
| Color Pack - Purples | $0.99 | one-time |
| Color Pack - Pinks | $0.99 | one-time |
| Color Pack - Yellow | $0.99 | one-time |

**What reviewers like**

- 👍 Simple and intuitive interface
- 🎨 Color and shape options available
- 💾 Save and export functionality (PDF, email)
- ⚡ Quick sketching for basic designs
- 🏗️ Useful for floor plans and layouts

**What reviewers complain about**

- 🐛 Frequent crashes and freezes
- 🐛 App crashes when zoomed in
- 🐛 Cannot open saved files without crashing
- ❌ Limited drawing capabilities
- ❌ No freehand drawing or handwriting support

**Reported bugs**

- App crashes when opening saved documents
- App crashes when zoomed in
- App crashes when adding text
- App crashes when using measurement/distance tool
- App crashes when drawing lines while zoomed

**Requested features**

- Eraser tool for selective line deletion
- Zoom in/out capability
- Pan/scroll functionality for larger canvases
- Freehand drawing mode
- Ability to move and edit objects after placement


## Frequently asked questions

### Is HVAC Pipe Sizer free?

HVAC Pipe Sizer costs $7.99, and also offers in-app purchases.

### Is Graph Paper free?

Graph Paper costs $3.99, and also offers in-app purchases.

### Which has better reviews, HVAC Pipe Sizer or Graph Paper?

HVAC Pipe Sizer is rated higher. HVAC Pipe Sizer averages 5.0 out of 5 from 1 ratings, while Graph Paper averages 1.0 from 8 ratings.

### Do HVAC Pipe Sizer or Graph Paper have ads?

Neither HVAC Pipe Sizer nor Graph Paper shows ads.

### Which is updated more often, HVAC Pipe Sizer or Graph Paper?

HVAC Pipe Sizer ships an update every 12 months, and Graph Paper every 5 weeks. Most recently, HVAC Pipe Sizer was updated on October 12, 2026 and Graph Paper on October 13, 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.*