CPS Link vs Duct Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CPS Link
Connect multiple wireless sensors to create a comprehensive diagnostic measurement system. Perform quick single measurements or complex full system diagnostics with analytics. Expand your system over time with new sensor solutions.
- Connect multiple wireless sensors
- Comprehensive diagnostic measurement system
- Perform quick measurements
- Complex system diagnostics with analytics
- Expandable sensor system
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CPS Link™ is a powerful, easy-to-use application that connects multiple CPS wireless sensors together at one time to create the world’s most comprehensive diagnostic measurement system. The flexibility of this patented system enables users to add sensors as required to perform quick one-step measurement tasks or more complex full home, facility or system diagnostics with analytics. A range of high quality wireless sensors are available to accommodate most common HVAC/R service needs, with more innovative sensor solutions in various levels of release and development. Interconnectivity between the CPS Link app and future sensors remains a primary criterion to provide users with the flexibility of building their own custom measurement systems, over time.
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.
- 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
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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
Verdict
The clearest difference is rating: Duct Calculator at 4.7 against CPS Link's 1.9. CPS Link's advantage is in-app purchases (none vs 1) and update cadence (every 3 weeks vs every 10 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
Both are free to download. Duct Calculator sells 1 one-off in-app purchase. CPS Link asks for nothing beyond the download.
Duct Calculator holds the better App Store score, 4.7 against 1.9. That said, the two scores are not equally well evidenced: CPS Link has 157 ratings behind it against 3, so its average is the more settled of the two.
CPS Link ships an update every 3 weeks, Duct Calculator every 10 months. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.
| Parameter | CPS Link | Duct Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 1.9 (157 ratings) | 4.7 (3 ratings) — better |
| Positive reviews | 13.3% of reviews | — |
| Number of ratings | 157 — better | 3 |
| Update frequency | Every 3 weeks — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 85 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | CPS Products | Sachinbhai Surani |
Customer experience
CPS Link
Duct Calculator
Bugs and requests
CPS Link
Reported bugs
4 issues- App crashes on launch
- Bluetooth connectivity problems
- Inconsistent readings and measurements
- Incompatible with newer iOS versions
Requested features
3 requests- Update app to fix compatibility issues
- Improve customer support and responsiveness
- Provide better documentation and troubleshooting guides
Duct Calculator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
CPS Link
No in-app purchases
Duct Calculator
- Lifetime premium$9.99
Questions
Is CPS Link free?
Is Duct Calculator free?
Which has better reviews, CPS Link or Duct Calculator?
Do CPS Link or Duct Calculator have ads?
Which is updated more often, CPS Link or Duct Calculator?
Other comparisons
