# Roof Guide vs JHT Engineering APP

The clearest difference is in-app purchases: JHT Engineering APP at none against Roof Guide's 4. JHT Engineering APP also leads on iOS requirement (12 vs 26.0). Roof Guide's advantage is update cadence (every 2 weeks vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Roof Guide sells 4 in-app purchases, starting at $1.99 per month. JHT Engineering APP asks for nothing beyond the download.

Roof Guide ships an update every 2 weeks, JHT Engineering APP every 4 months. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Roof Guide | JHT Engineering APP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (19 ratings)](https://appshunter.io/ios/app/roof-guide-carpentry-calc/id920670842/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 63.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 4 months |
| Monetization | Free with in-app purchases | — |
| Size | 31 MB | 13 MB |
| Requires iOS | 26.0 | **12** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Infoguide Pty Ltd](https://appshunter.io/developer/920670841) | [JOHNSON HEALTH TECH CO., LTD.](https://appshunter.io/developer/994439492) |

## What reviewers say

### Roof Guide

[App page](https://appshunter.io/ios/app/roof-guide-carpentry-calc/id920670842)

This app provides specialized calculators for roofing, framing, decking, stairs, and concrete projects. It helps construction professionals estimate quantities, costs, and set out materials accurately using US or metric measurements.

**Highlights:** Roof framing calculations, Decking and flooring estimator, Stud wall setout and costing, Stair framing calculations, Concrete volume and cost estimator, Metric and imperial unit conversion

**Features:** Family Sharing, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| 6 Months | $7.99 | per 6 months |
| Annual | $12.99 | per year |
| Lifetime License | $29.99 | one-time |


### JHT Engineering APP

[App page](https://appshunter.io/ios/app/jht-engineering-app/id1474324542)

**In-app purchases:** none


## Frequently asked questions

### Is Roof Guide free?

Roof Guide is free to download, with in-app purchases available.

### Is JHT Engineering APP free?

JHT Engineering APP is free to download, with no in-app purchases.

### Do Roof Guide or JHT Engineering APP have ads?

Neither Roof Guide nor JHT Engineering APP shows ads.

### Which is updated more often, Roof Guide or JHT Engineering APP?

Roof Guide ships an update every 2 weeks, and JHT Engineering APP every 4 months. Most recently, Roof Guide was updated on October 24, 2026 and JHT Engineering APP on October 29, 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.*