# CPS Link vs Ductulator

The clearest difference is price: CPS Link at Free against Ductulator's $3.99. CPS Link also leads on update cadence (every 3 weeks vs every 2 months) and iOS requirement (11.0 vs 18.6). Ductulator's advantage is rating (4.7 vs 1.9) and review sentiment (50% vs 13%). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

CPS Link is free to download; Ductulator costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Ductulator holds the better App Store score, 4.7 against 1.9. Both are backed by a comparable volume of ratings — 154 and 317 respectively. Written reviews point the same way: 13% of CPS Link's written reviews are positive against 50% of Ductulator's.

CPS Link ships an update every 3 weeks, Ductulator every 2 months. The most recent releases landed on September 12, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | CPS Link | Ductulator |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [1.9 (154 ratings)](https://appshunter.io/ios/app/cps-link/id1185092042/reviews) | **[4.7 (317 ratings)](https://appshunter.io/ios/app/ductulator-duct-sizing/id1474939475/reviews)** |
| Number of ratings | 154 | **317** |
| Positive reviews | 13.5% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | Free |
| Best chart rank | — | **#28** |
| Size | 85 MB | 1 MB |
| Requires iOS | **11.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CPS Products, Inc.](https://appshunter.io/developer/945771072) | [Wassim Murr](https://appshunter.io/developer/1474939474) |

## What reviewers say

### CPS Link

[App page](https://appshunter.io/ios/app/cps-link/id1185092042)

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.

**Highlights:** Connect multiple wireless sensors, Comprehensive diagnostic measurement system, Perform quick measurements, Complex system diagnostics with analytics, Expandable sensor system

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Worked well initially
- 💡 Useful features

**What reviewers complain about**

- 🐛 Frequent crashes
- 🔌 Connectivity issues
- ⚠️ Unreliable performance
- 💸 Expensive for poor quality

**Reported bugs**

- App crashes on launch
- Bluetooth connectivity problems
- Inconsistent readings and measurements
- Incompatible with newer iOS versions

**Requested features**

- Update app to fix compatibility issues
- Improve customer support and responsiveness
- Provide better documentation and troubleshooting guides


### Ductulator

[App page](https://appshunter.io/ios/app/ductulator-duct-sizing/id1474939475)

**Currently charting:** #28 Top Paid · Productivity (US App Store)

Instantly calculate HVAC duct sizes based on airflow, friction rate, or velocity. This tool provides accurate duct dimensions in seconds without needing charts, supporting various duct types and units.

**Highlights:** Instant duct sizing, Friction rate or velocity calculation, Multiple valid duct dimensions, IP and SI units support, Detailed sizing mode, Rectangular, circular, and flexible ducts

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CPS Link free?

CPS Link is free to download, with no in-app purchases.

### Is Ductulator free?

Ductulator costs $3.99, with no in-app purchases.

### Which has better reviews, CPS Link or Ductulator?

Ductulator is rated higher. CPS Link averages 1.9 out of 5 from 154 ratings, while Ductulator averages 4.7 from 317 ratings.

### Do CPS Link or Ductulator have ads?

Neither CPS Link nor Ductulator shows ads.

### Which is updated more often, CPS Link or Ductulator?

CPS Link ships an update every 3 weeks, and Ductulator every 2 months. Most recently, CPS Link was updated on September 12, 2026 and Ductulator on September 22, 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.*