Comparison

LYNKUP vs Duct Calculator

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

Head to head
About

LYNKUP

This voice-first assistant helps HVAC technicians troubleshoot issues hands-free using AI. It allows live streaming of tool data and offers direct support sessions with video and chat. Recorded sessions with transcripts are available for review and job management.

Highlights
  • Voice-activated AI troubleshooting
  • Live Bluetooth tool data streaming
  • Video, chat, and shared tool data support sessions
  • Recorded sessions with transcripts
  • Job history review and filtering
  • Account, tool, and billing management
Features
Read full description

LYNKUP is a voice-first sidekick for HVAC technicians. Talk to AiTAS to troubleshoot faster, keep your hands free, and stream live Fieldpiece readings over Bluetooth. Need a human? Jump into a live support session with video, chat, and shared tool data. Sessions are recorded with transcripts, and History lets you review, filter by date, and reopen past jobs. Manage your account, tools, and billing from Settings.

About

Duct Calculator

This professional HVAC utility assists engineers and technicians with precise duct sizing and airflow calculations for ventilation systems. It simplifies essential calculations for both design and installation work, improving on-site efficiency.

Highlights
  • Calculate duct sizes using airflow (CFM) and velocity (FPM)
  • Supports rectangular and round duct sizing in inches
  • Determine air flow rate in CFM
  • Calculate air velocity in FPM
  • Simple interface for fast on-site calculations
Features
Read full description

Duct Calculator is a focused duct sizing tool for HVAC engineers, designers and installation technicians. Enter what you know and get the duct dimensions, airflow or air velocity you need, without a chart or a slide rule. CALCULATIONS - Duct size: find the required duct dimensions from airflow (CFM) and air velocity (FPM). - Airflow: determine the airflow rate in CFM. - Air velocity: determine velocity in FPM to help verify system performance. DUCT SHAPES - Round ducts - Rectangular ducts - Results shown in inches WHO IT IS FOR - HVAC engineers and designers checking a duct size during design work. - Installation technicians and contractors who need a quick answer on site. - Students learning how airflow, velocity and duct size relate. WHERE IT HELPS - Sizing a new supply or return run from a known CFM. - Checking whether an existing duct keeps velocity within your target. - Comparing a round duct with a rectangular one when space is tight. SIMPLE BY DESIGN A clean interface with only the inputs you need, so you get an answer quickly on the job. Duct Calculator is free to use. An optional one-time upgrade removes ads. Results are intended as a calculation aid. Always confirm designs against applicable codes and project requirements. Download Duct Calculator and size your next duct run. Privacy Policy : https://semiconhub.in/manager/privacy.html Terms and Condition : https://semiconhub.in/manager/tcondition.html

Screenshots

LYNKUP4 screens
Duct Calculator4 screens

Verdict

The call

The clearest difference is in-app purchases: LYNKUP at none against Duct Calculator's 1. LYNKUP also leads on rating (5.0 vs 4.7) and update cadence (every 2 months vs every 10 months). On price, ratings volume, 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. Duct Calculator sells 1 one-off in-app purchase. LYNKUP asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

LYNKUP holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 2 and 3 respectively.

UpkeepUpdate frequency

LYNKUP ships an update every 2 months, Duct Calculator every 10 months. The most recent releases landed on October 30, 2026 and November 1, 2026 respectively.

Scorecard4 real differences · 5 level
LYNKUP versus Duct Calculator: the parameters behind the verdict, then further details
ParameterLYNKUPDuct Calculator
PriceFreeFree
Rating5.0 (2 ratings) — better4.7 (3 ratings)
Number of ratings23 — better
Update frequencyEvery 2 months — betterEvery 10 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.1 — better15.6
Further details — not scored
Size165 MB44 MB
Age rating4+4+
DeveloperLYNKUP, LLCSachinbhai Surani

Customer experience

LYNKUP

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Duct Calculator

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

LYNKUP

No in-app purchases

1 purchases

Duct Calculator

One-time1
  • Lifetime premium$9.99

Questions

Is LYNKUP free?
LYNKUP is free to download, with no in-app purchases.
Is Duct Calculator free?
Duct Calculator is free to download, with in-app purchases available.
Which has better reviews, LYNKUP or Duct Calculator?
LYNKUP is rated higher. LYNKUP averages 5.0 out of 5 from 2 ratings, while Duct Calculator averages 4.7 from 3 ratings.
Do LYNKUP or Duct Calculator have ads?
Neither LYNKUP nor Duct Calculator shows ads.
Which is updated more often, LYNKUP or Duct Calculator?
LYNKUP ships an update every 2 months, and Duct Calculator every 10 months. Most recently, LYNKUP was updated on October 30, 2026 and Duct Calculator on November 1, 2026.

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