# HVAC Pipe Sizer vs TouchDraw 2

The clearest difference is price: TouchDraw 2 at Free against HVAC Pipe Sizer's $7.99. TouchDraw 2 also leads on update cadence (every 3 weeks vs every 12 months) and ratings volume (21 vs 1). HVAC Pipe Sizer's advantage is rating (5.0 vs 3.9). On review sentiment, ads, in-app purchases and device support there is nothing between them.

TouchDraw 2 is free to download; HVAC Pipe Sizer costs $7.99 up front. HVAC Pipe Sizer sells 1 one-off in-app purchase and TouchDraw 2 sells 2 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 3.9. That said, the two scores are not equally well evidenced: TouchDraw 2 has 21 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 74% of TouchDraw 2's.

HVAC Pipe Sizer ships an update every 12 months, TouchDraw 2 every 3 weeks. The most recent releases landed on September 26, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer | TouchDraw 2 |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-plus/id342239204/reviews)** | [3.9 (21 ratings)](https://appshunter.io/ios/app/touchdraw-2/id1489381377/reviews) |
| Number of ratings | 1 | **21** |
| Positive reviews | **80.0% of reviews** | 73.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 18 MB | 114 MB |
| Requires iOS | 15.6 | **12.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Elevenworks LLC](https://appshunter.io/developer/382021239) |

## What reviewers say

### HVAC Pipe Sizer

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

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 |


### TouchDraw 2

[App page](https://appshunter.io/ios/app/touchdraw-2/id1489381377)

Create vector drawings and diagrams with an intuitive interface designed for touch and Apple Pencil. Ideal for flowcharts, floor plans, and technical layouts, it offers smart tools for precision and flexibility. Unlock the full experience with a one-time purchase after a free trial.

**Highlights:** Intuitive gesture-based interface, Smart shape recognition and snapping, Layers, dimensions, and connector lines, Supports SVG, PDF, PNG, and Visio formats, iCloud Drive integration, Free 7-day trial

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Free Trial | Free | one-time |
| Unlock Editing | $14.99 | one-time |


## Frequently asked questions

### Is HVAC Pipe Sizer free?

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

### Is TouchDraw 2 free?

TouchDraw 2 is free to download, with in-app purchases available.

### Which has better reviews, HVAC Pipe Sizer or TouchDraw 2?

HVAC Pipe Sizer is rated higher. HVAC Pipe Sizer averages 5.0 out of 5 from 1 ratings, while TouchDraw 2 averages 3.9 from 21 ratings.

### Do HVAC Pipe Sizer or TouchDraw 2 have ads?

Neither HVAC Pipe Sizer nor TouchDraw 2 shows ads.

### Which is updated more often, HVAC Pipe Sizer or TouchDraw 2?

HVAC Pipe Sizer ships an update every 12 months, and TouchDraw 2 every 3 weeks. Most recently, HVAC Pipe Sizer was updated on September 26, 2026 and TouchDraw 2 on October 14, 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.*