Comparison

ViGuide vs DuctCalc.Ca

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

Head to head
About

ViGuide

Streamline the process of commissioning Viessmann boilers with this user-friendly mobile application. It guides trained professionals through each step, ensuring a safe, efficient, and complete installation.

Highlights
  • Streamlined boiler commissioning
  • User-friendly mobile interface
  • Step-by-step guidance
  • Ensures complete and correct steps
  • Efficient installation process
Features
Read full description

ViGuide - the best way to commission a Viessmann boiler • Please note this app is intended only for trained professionals. If you are not certified to install and commission a Viessmann product, please call your local installer or contact us to help you find a Viessmann partner in your area. • It’s time for a new start We have completely streamlined boiler commissioning and moved the process to a user-friendly mobile app. In a couple of simple steps, ViGuide will safely guide you through the process of commissioning a Viessmann boiler. Even you are new to the Viessmann boiler model, the simplified app allows you to carry out the steps with ease, as efficiently as possible and in less time. The app will guide you step-by-step through the commissioning process and thus ensures that all necessary commissioning steps are carried out completely and in the correct order.

About

DuctCalc.Ca

This utility app calculates duct dimensions and air velocity using two methods: Equal Friction and Velocity. It supports both round and rectangular ducts, offering precise calculations for HVAC professionals. Offline functionality is available with a subscription.

Highlights
  • Duct sizing calculator
  • Equal Friction Method
  • Velocity Method
  • Round and rectangular duct support
  • Offline functionality
  • Full air flow range activation
Features
Read full description

DuctCalc.Ca is the iOS offline version of the most popular online ductulator app (ductcalc.ca) Enjoy using the app with no internet connection when subscribed! App engineering explanation: ------------------------------ Equal Friction Method: Using a predefined static pressure loss per unit of duct length, DuctCalc.Ca Ductulator App calculates the diameter of round duct and the other dimension of rectangular duct. Based on the calculated dimensions, the air velocity will be calculated for both duct shapes and dimensions. Velocity Method: Using a predefined air velocity, DuctCalc.Ca Ductulator App calculates the diameter of round duct and the other dimension of a rectangular duct. Based on the calculated dimensions, the static pressure loss will be calculated for both duct shapes and dimensions. Note that unlike conventional ductulators, this ductulator will calculate the dimensions of the rectangular duct based on the given velocity and it then calculates the static pressure loss for the rectangular duct based on the given velocity and dimensions. Most old calculators will only use the given velocity to calculate the diameter of the round duct then it calculates the static pressure loss for the round duct and uses that static pressure to calculate the rectangular duct dimensions which is not the case here for more precise velocity output. Colebrook equation is used to solve for Darcy's friction factor and calculates the static pressure loss in the duct until it matches the desired input at defined airflow and absolute roughness of the inner material of the duct touching the moving air. In-App Purchases: ------------------- • With no subscription the app will calculate for an air flow range between (950 and 1100 [cfm]). To activate full air flow functionality. There are four subscription options: one month, three months, six months and one year. • All subscription options will activate the "Full Air Flow Functionality" of the duct sizing app for that specific subscription period. The full air flow range is (1 to 500,000 [CFM] or 1 to 235,974 [L/s] in metric units). • Payment will be charged to iTunes Account at confirmation of purchase. • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Privacy Policy: https://ductcalc.ca/?page=agreement Terms of Service: https://ductcalc.ca/?page=agreement

Screenshots

ViGuide4 screens
DuctCalc.Ca1 screens

Verdict

The call

The clearest difference is rating: ViGuide at 4.5 against DuctCalc.Ca's 1.9. ViGuide also leads on in-app purchases (none vs 4) and update cadence (every 5 weeks vs every 4 months). DuctCalc.Ca's advantage is review sentiment (50% vs 41%) and iOS requirement (11.3 vs 16.0). 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. DuctCalc.Ca sells 4 one-off in-app purchases. ViGuide asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ViGuide holds the better App Store score, 4.5 against 1.9. That said, the two scores are not equally well evidenced: ViGuide has 208 ratings behind it against 20, so its average is the more settled of the two. Written reviews complicate that: 41% of ViGuide's written reviews are positive against 50% of DuctCalc.Ca's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

ViGuide ships an update every 5 weeks, DuctCalc.Ca every 4 months. The most recent releases landed on October 26, 2026 and October 17, 2026 respectively.

Scorecard7 real differences · 3 level
ViGuide versus DuctCalc.Ca: the parameters behind the verdict, then further details
ParameterViGuideDuctCalc.Ca
PriceFreeFree
Rating4.5 (208 ratings) — better1.9 (20 ratings)
Positive reviews40.5% of reviews50.0% of reviews — better
Number of ratings208 — better20
Update frequencyEvery 5 weeks — betterEvery 4 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.011.3 — better
Further details — not scored
Size1.5 GB9 MB
Age rating4+4+
DeveloperViessmann IT Service GmbHFiras Kneifati

Customer experience

ViGuide

All ratings208 ratings
Positive87.0%
Neutral1.9%
Negative11.1%
Written reviews74 reviews
Positive40.5%
Neutral13.5%
Negative45.9%

DuctCalc.Ca

All ratings20 ratings
Positive20.0%
Neutral5.0%
Negative75.0%
Written reviews14 reviews
Positive50.0%
Neutral7.1%
Negative42.9%

In-app purchases

None

ViGuide

No in-app purchases

4 purchases

DuctCalc.Ca

One-time4
  • One Month Full Air Flow$6.99
  • Three Months Full Air Flow$17.99
  • Six Months Full Air Flow$29.99
Show 1 more
  • One Year Full Air Flow$49.99

Questions

Is ViGuide free?
ViGuide is free to download, with no in-app purchases.
Is DuctCalc.Ca free?
DuctCalc.Ca is free to download, with in-app purchases available.
Which has better reviews, ViGuide or DuctCalc.Ca?
ViGuide is rated higher. ViGuide averages 4.5 out of 5 from 208 ratings, while DuctCalc.Ca averages 1.9 from 20 ratings.
Do ViGuide or DuctCalc.Ca have ads?
Neither ViGuide nor DuctCalc.Ca shows ads.
Which is updated more often, ViGuide or DuctCalc.Ca?
ViGuide ships an update every 5 weeks, and DuctCalc.Ca every 4 months. Most recently, ViGuide was updated on October 26, 2026 and DuctCalc.Ca on October 17, 2026.

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