# HyTools vs dDrives

The clearest difference is rating: dDrives at 4.5 against HyTools's 4.0. dDrives also leads on ratings volume (29 vs 5) and iOS requirement (12.0 vs 15.0). HyTools's advantage is in-app purchases (none vs 1). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. dDrives sells 1 one-off in-app purchase. HyTools asks for nothing beyond the download.

dDrives holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: dDrives has 29 ratings behind it against 5, so its average is the more settled of the two. Written reviews split almost evenly too, at 50% and 50% positive.

HyTools ships an update every 6 weeks, dDrives monthly. The most recent releases landed on September 28, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | HyTools | dDrives |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (5 ratings)](https://appshunter.io/ios/app/hytools/id537674477/reviews) | **[4.5 (29 ratings)](https://appshunter.io/ios/app/ddrives-vfd-help/id1214502123/reviews)** |
| Number of ratings | 5 | **29** |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Monetization | Free | Free |
| Size | 114 MB | 10 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [IMI Hydronic Engineering International SA](https://appshunter.io/developer/508015425) | [Evgeny Makarenkov](https://appshunter.io/developer/1214502122) |

## What reviewers say

### HyTools

[App page](https://appshunter.io/ios/app/hytools/id537674477)

This app provides HVAC professionals with a comprehensive suite of hydronic calculation tools. It assists with tasks like valve sizing, pressure drop calculations, and radiator power estimation. The tool offers unit conversion and language selection for user convenience.

**Highlights:** Hydronic calculator, Valve sizing and presetting, Radiator power estimation, Pipe sizing, Unit conversion, Pressure maintenance calculation

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

**In-app purchases:** none


### dDrives

[App page](https://appshunter.io/ios/app/ddrives-vfd-help/id1214502123)

Access alarm descriptions, troubleshooting guides, and user manuals for Danfoss VLT drives. This professional tool provides essential information for commissioning and service, supporting a wide range of drive models.

**Highlights:** Alarm descriptions, Troubleshooting guides, User manual links, Support for multiple VLT drive models, Multilingual alarm descriptions

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Drives | $1.99 | one-time |


## Frequently asked questions

### Is HyTools free?

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

### Is dDrives free?

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

### Which has better reviews, HyTools or dDrives?

dDrives is rated higher. HyTools averages 4.0 out of 5 from 5 ratings, while dDrives averages 4.5 from 29 ratings.

### Do HyTools or dDrives have ads?

Neither HyTools nor dDrives shows ads.

### Which is updated more often, HyTools or dDrives?

HyTools ships an update every 6 weeks, and dDrives monthly. Most recently, HyTools was updated on September 28, 2026 and dDrives on October 9, 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.*