# DuctCalc.Ca vs Chippy Tools

The clearest difference is rating: Chippy Tools at 4.5 against DuctCalc.Ca's 1.9. Chippy Tools also leads on update cadence (every 8 days vs every 4 months) and ratings volume (907 vs 20). DuctCalc.Ca's advantage is iOS requirement (11.3 vs 16.0). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. DuctCalc.Ca sells 4 one-off in-app purchases and Chippy Tools sells 9 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Chippy Tools holds the better App Store score, 4.5 against 1.9. That said, the two scores are not equally well evidenced: Chippy Tools has 907 ratings behind it against 20, so its average is the more settled of the two. Written reviews point the same way: 50% of DuctCalc.Ca's written reviews are positive against 55% of Chippy Tools's.

DuctCalc.Ca ships an update every 4 months, Chippy Tools every 8 days. The most recent releases landed on November 2, 2026 and November 14, 2026 respectively.

## The numbers

| Metric | DuctCalc.Ca | Chippy Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.9 (20 ratings)](https://appshunter.io/ios/app/ductcalcca/id1434460375/reviews) | **[4.5 (907 ratings)](https://appshunter.io/ios/app/chippy-tools-construction/id1579138717/reviews)** |
| Number of ratings | 20 | **907** |
| Positive reviews | 50.0% of reviews | **54.8% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 8 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 9 MB | 46 MB |
| Requires iOS | **11.3** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Firas Kneifati](https://appshunter.io/developer/1434460374) | [Peth Pty Ltd](https://appshunter.io/developer/662891650) |

## What reviewers say

### DuctCalc.Ca

[App page](https://appshunter.io/ios/app/ductcalcca/id1434460375)

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:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Month Full Air Flow | $6.99 | one-time |
| Three Months Full Air Flow | $17.99 | one-time |
| Six Months Full Air Flow | $29.99 | one-time |
| One Year Full Air Flow | $49.99 | one-time |


### Chippy Tools

[App page](https://appshunter.io/ios/app/chippy-tools-construction/id1579138717)

This app simplifies complex calculations for construction professionals. It offers a variety of tools for tasks like spacing, measurements, and material estimation, helping to reduce errors and save time on job sites. Available on iPhone and iPad, it aims to be an essential tool for tradespeople.

**Highlights:** Baluster spacing calculator, Flat run attached baluster calculator, Square calculator, Concrete calculator, Stair calculator, Supports millimeters, feet, and inches

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chippy Tools Pro - Weekly | $2.99 | per 7 days |
| Chippy Tools Pro - Weekly | $3.99 | per 7 days |
| Chippy Tools Pro - Quarterly | $4.99 | per 3 months |
| Chippy Tools Pro - Monthly | $5.99 | per month |
| Chippy Tools Pro - Monthly | $5.99 | per month |
| Chippy Tools Pro - Annual | $19.99 | per year |
| Chippy Tools Pro - Annual | $19.99 | per year |
| Chippy Tools Pro - Annual | $19.99 | per year |
| One Time Purchase | $85.00 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Quick and efficient
- 💡 Useful construction tools
- 🙌 Great for DIY projects

**What reviewers complain about**

- 🤔 Confusing interface
- 💰 Expensive subscription
- 🐛 Inaccurate calculations
- 🔒 Difficult to cancel subscription

**Reported bugs**

- Square check feature not working
- Measurements disappear after partial use

**Requested features**

- Add more construction-related calculators
- Improve stair and rafter tools
- Include material quantity estimations
- Add support for metric and imperial units


## Frequently asked questions

### Is DuctCalc.Ca free?

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

### Is Chippy Tools free?

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

### Which has better reviews, DuctCalc.Ca or Chippy Tools?

Chippy Tools is rated higher. DuctCalc.Ca averages 1.9 out of 5 from 20 ratings, while Chippy Tools averages 4.5 from 907 ratings.

### Do DuctCalc.Ca or Chippy Tools have ads?

Neither DuctCalc.Ca nor Chippy Tools shows ads.

### Which is updated more often, DuctCalc.Ca or Chippy Tools?

DuctCalc.Ca ships an update every 4 months, and Chippy Tools every 8 days. Most recently, DuctCalc.Ca was updated on November 2, 2026 and Chippy Tools on November 14, 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.*