HyTools vs dDrives
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HyTools
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.
- Hydronic calculator
- Valve sizing and presetting
- Radiator power estimation
- Pipe sizing
- Unit conversion
- Pressure maintenance calculation
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IMI Hydronic Engineering proudly presents HyTools, the user-friendly hydronic calculator App for HVAC professionals. Features include: - Hydronic calculator (enter any two values and get the third one): - flow - Kv/Cv - pressure drop - power - flow - temperature difference - flow - valve setting - pressure drop - Dirt and air separator pressure drop calculation - Valve sizing and presetting - Radiator power estimation (panel and column) - Radiator valve sizing and presetting - Pipe sizing - Unit conversion - Run-time selection of localisation - Run-time selection of language - Pressure maintenance and vacuum degassing calculation and selection for heating, cooling and solar systems Stay tuned for great upcoming updates adding further hydronic calculation functions. Please visit www.imi-hydronic.com for more information and contact details. Phone numbers to local support can be found here: http://www.imi-hydronic.com/en/contact/ IMI Hydronic Engineering International SA is the leading global provider and expert in hydronic distribution systems and room temperature control, with experience in more than 100,000 projects worldwide. We help our customers everywhere optimise HVAC systems so they deliver desired comfort with optimal efficiency. IMI Hydronic Engineering is part of the international engineering group IMI plc which is listed as a member of the FTSE 100 on the London Stock Exchange.
dDrives
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.
- Alarm descriptions
- Troubleshooting guides
- User manual links
- Support for multiple VLT drive models
- Multilingual alarm descriptions
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The "dDrives - VFD help" app provides quick access to alarm descriptions of Danfoss VLT drives. In a second you get a full alarm description, troubleshooting guide and even a link to the latest user manual. App greatly helps by commissioning and service giving you the necessary information when you need it and where you need it. It is a small but really feature-full application. A professional tool for professionals. Currently supported drives: VLT2800, VLT5000, FC51, FC101, FC102, FC103, FC202, FC280, FC301, FC302, FCD302, FCM106, FCP106, LD302, MCD200, MCD500, MCO305, MCO350, MCO351. The app is in English. For most popular drives the alarms descriptions are also available in French, Português, Russian, Spanish and simplified Chinese. DISCLAIMER This app IS NOT affiliated with Danfoss A/S or any of its affiliates!
Screenshots
Verdict
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.
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. 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.
| Parameter | HyTools | dDrives |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (5 ratings) | 4.5 (29 ratings) — better |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| Number of ratings | 5 | 29 — better |
| Update frequency | Every 6 weeks | Monthly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 114 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | IMI Hydronic Engineering International SA | Evgeny Makarenkov |
Customer experience
HyTools
dDrives
In-app purchases
HyTools
No in-app purchases
dDrives
- All Drives$1.99









