# Ductulator vs ChekCap

The clearest difference is rating: ChekCap at 5.0 against Ductulator's 4.5. ChekCap also leads on in-app purchases (none vs 2) and update cadence (every 10 days vs every 8 months). Ductulator's advantage is ratings volume (34 vs 3). On price, ads and device support there is nothing between them.

Both are free to download. Ductulator sells 2 in-app purchases, starting at $4.99 per month. ChekCap asks for nothing beyond the download.

ChekCap holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Ductulator has 34 ratings behind it against 3, so its average is the more settled of the two.

Ductulator ships an update every 8 months, ChekCap every 10 days. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Ductulator | ChekCap |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (34 ratings)](https://appshunter.io/ios/app/ductulator-duct-calculator/id6757307937/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/chekcap/id6762668751/reviews)** |
| Number of ratings | **34** | 3 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 10 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 42 MB | 185 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mikhail Nikitin](https://appshunter.io/developer/1826368571) | [Mohamed Kharbat](https://appshunter.io/developer/1894953065) |

## What reviewers say

### Ductulator

[App page](https://appshunter.io/ios/app/ductulator-duct-calculator/id6757307937)

This app provides professional HVAC duct sizing and psychrometric calculations in a single tool. It offers detailed calculations for various duct types and materials, along with comprehensive humid air property analysis. Designed for HVAC professionals, it replaces traditional ductulators with accurate digital functionality.

**Highlights:** Duct sizing for round, rectangular, and flexible ducts, Fittings pressure drop calculation, Psychrometric analysis with interactive chart, Supports Imperial and Metric units, Pre-configured velocity limits for application types, Real-time validation warnings

**Features:** Family Sharing, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| premium | $4.99 | per month |
| premium | $29.99 | per year |


### ChekCap

[App page](https://appshunter.io/ios/app/chekcap/id6762668751)

This diagnostic tool allows technicians to check capacitor health under load without powering down equipment. It provides real-time analysis for improved efficiency and workflow.

**Highlights:** Live capacitor analysis, Check under load conditions, No equipment downtime required, Circuit operation uninterrupted, Improved workflow efficiency

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ductulator free?

Ductulator is free to download, with in-app purchases available.

### Is ChekCap free?

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

### Which has better reviews, Ductulator or ChekCap?

ChekCap is rated higher. Ductulator averages 4.5 out of 5 from 34 ratings, while ChekCap averages 5.0 from 3 ratings.

### Do Ductulator or ChekCap have ads?

Neither Ductulator nor ChekCap shows ads.

### Which is updated more often, Ductulator or ChekCap?

Ductulator ships an update every 8 months, and ChekCap every 10 days. Most recently, Ductulator was updated on October 24, 2026 and ChekCap on October 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.*