Comparison

Roof Guide vs JHT Engineering APP

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Roof Guide

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
Read full description

Roofing and framing carpentry calculator, decking, stairs, concrete, stud wall calculators. In addition to the roof calculators the decking / flooring, stud wall and concrete calculators also estimate quantities and costs. US or metric measurements. Developed by a carpenter and builder, used by carpenters, roofers, contractors, builders and construction pros in over 40 countries around the world. Roof Guide (previously Roofers Guide) is not a 'How to App’ - you know how! It is designed to save you the time and effort required for roof, framing, deck, stairs & other building / construction calculations Accurate, reliable and easy to use, it is an indispensable tool for the construction pro. Metric or Imperial (feet, inches and fractions of an inch (or decimal) Print, email or reports. Never forget your span or rafter tables, red roofing book and other standalone construction calculators again! CALCULATIONS INCLUDE: ROOF FRAMING:- - Rafter,Hip/Valley Lengths - Multiple cut angles, including for compound saw - Template (adjustable) sizes for the same cuts - where used - Setout of Creepers/Jack Rafters(US), ridge and wall - Roof Pitch Factor degrees, inches (US), D:M:S - Rise : Run ratio - Birdsmouth calculations - Drop or Chamfer Hip adjustments - Multiple heights measures, including:- top/bottom of ridge, roof centre, - Hypotenuse calculations eg: Calculate Pitch from ridge rise - Adjust pitching plate heights where one wall is higher eg Bulkheads - Ridge length, area, rake factors - Print, email or message reports DECKING & FLOORING SETOUT, MATERIAL ESTIMATING and COSTING:- - Options for Insets, single or double bearers - Set Spacing type to maximum, fixed or equal - Set pricing for materials / labour to calculate cost and cost/area TIMBER SETOUT:- - Set Spacing type to maximum, fixed or equal - Insets at start and end. STUD WALLS SETOUT, MATERIAL ESTIMATING and COSTING:- - Raked or flat walls - Sizing, Quantity & Cost Estimates - Timber (studs, noggins, plates) & Sheeting - Comprehensive setout lists - bottom, top - Align sheets on width, length or no sheets STAIR FRAMING (currently for single stair runs):- Permits Multiple restrictions on risers, treads, inclines and also allows application of 2R+G (2R+TD in US) in jurisdictions required - to meet standards. Other than StairCalc (which is our Stair only app) we do not know of an app that does this simultaneously. Also calculations allow for situations where the overall stair rise and run are fixed or variable allowing maximum flexibility. - Number and size of step risers, treads, step inclines, - Step incline (Also changeable), - Stairwell opening, - Stringer Lengths CONCRETE CALCULATOR / ESTIMATOR:- - Calculate quantities for slabs, footings, round and rectangular/square holes. - Estimates total volume and cost allowing for waste. CONVERTER:- - Convert Lengths, Area, Volume: Metric and US/Imperial. - Work in Decimal units or Yds/Ft/In/Fraction format to Metric, decimal US. EASY TO USE GENERAL CALCULATOR WITH TAPE: - Calculate (add, subtract etc) directly in feet / inches / fractions or decimals. - Common functions for quick calculation EXTENSIVE HELP: Extensive help - Tap twice on most buttons for more info. Optimised for all iPhones and iPads in portrait mode. INFOGUIDE: Infoguide is part of a small building firm based in Western Australia. This app was created by a former Roof Framing Carpenter for our team of carpenters. We use it and believe it will be as helpful to other carpenters as it was for us. Terms of Service: http://www.apple.com/legal/itunes/appstore/dev/stdeula

About

JHT Engineering APP

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•The field engineer can view the repair cases by mobile device such as Smart Phone or Pad. •This APP allows access to field engineers from local JHT subsidiaries around the world. Function of APP Menu: •Repair: View repair case list and filter by desired conditions. •Calendar: View repair case calendar by day, week or by month. •Maintenance: View maintenance case list. •Web Links : Link to other troubleshooting sources. •Synchronize : Synchronize repair notes to CRM. •Logout: Signoff current account Features descriptions: •Technician can view the repair case calendar (Day, Week & Month). •Technician can view the route to customer location using Google Maps. •The APP can record the mileage and moving time for each customer visit. •Quickly add machines not listed in repair case while onsite. •Issue a quotation to the customer. •Technician can maintain the case record with repair notes and parts replaced. •Capture customer signature after work has been completed. •Technician can link to third party web sites for additional troubleshooting support.

Screenshots

Roof Guide4 screens
JHT Engineering APP4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Roof Guide versus JHT Engineering APP: the parameters behind the verdict, then further details
ParameterRoof GuideJHT Engineering APP
PriceFreeFree
Rating4.0 (19 ratings) — better—
Positive reviews63.6% of reviews—
Number of ratings19 — better—
Update frequencyEvery 2 weeks — betterEvery 4 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.012 — better
Further details — not scored
Size31 MB13 MB
Age rating4+4+
DeveloperInfoguide Pty LtdJOHNSON HEALTH TECH CO., LTD.

In-app purchases

4 purchases

Roof Guide

Subscriptions3
  • Monthly$1.991 Month
  • 6 Months$7.996 Months
  • Annual$12.991 Year
One-time1
  • Lifetime License$29.99
None

JHT Engineering APP

No in-app purchases

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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