# HyTools vs DWSIM Simulator

The clearest difference is rating: DWSIM Simulator at 4.6 against HyTools's 4.0. DWSIM Simulator also leads on ratings volume (105 vs 5) and iOS requirement (12.0 vs 15.0). HyTools's advantage is in-app purchases (none vs 10). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. DWSIM Simulator sells 10 one-off in-app purchases. HyTools asks for nothing beyond the download.

DWSIM Simulator holds the better App Store score, 4.6 against 4.0. That said, the two scores are not equally well evidenced: DWSIM Simulator has 105 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 50% of HyTools's written reviews are positive against 57% of DWSIM Simulator's.

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on September 28, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | HyTools | DWSIM Simulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (5 ratings)](https://appshunter.io/ios/app/hytools/id537674477/reviews) | **[4.6 (105 ratings)](https://appshunter.io/ios/app/dwsim-simulator/id1162110266/reviews)** |
| Number of ratings | 5 | **105** |
| Positive reviews | 50.0% of reviews | **57.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Monetization | Free | Free |
| Size | 114 MB | 106 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [IMI Hydronic Engineering International SA](https://appshunter.io/developer/508015425) | [Daniel Medeiros](https://appshunter.io/developer/1091004600) |

## 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


### DWSIM Simulator

[App page](https://appshunter.io/ios/app/dwsim-simulator/id1162110266)

This app provides a powerful offline chemical process simulation tool. It allows engineers to build complex process models, perform thermodynamic calculations, and analyze various unit operations. Features include a touch-enabled PFD interface, extensive compound databases, and advanced calculation engines.

**Highlights:** Offline chemical process simulation, Touch-enabled PFD drawing interface, Extensive thermodynamic models, Compound database for 1500+ compounds, Unit operation models, Chemical reaction and reactor support, Flowsheet parametric studies

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| User-Defined Unit Set | $1.99 | one-time |
| Flowsheet Utilities Pack | $2.99 | one-time |
| Unit Operations Pack 1 | $2.99 | one-time |
| Unit Operations Pack 2 | $2.99 | one-time |
| Unit Operations Pack 3 | $2.99 | one-time |
| Activity Coeff. Model Pack | $3.99 | one-time |
| Equation of State Model Pack | $3.99 | one-time |
| Reactor Models Pack | $4.99 | one-time |
| Unlock All Features | $9.99 | one-time |
| Unlock All Features | $39.99 | one-time |


## Frequently asked questions

### Is HyTools free?

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

### Is DWSIM Simulator free?

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

### Which has better reviews, HyTools or DWSIM Simulator?

DWSIM Simulator is rated higher. HyTools averages 4.0 out of 5 from 5 ratings, while DWSIM Simulator averages 4.6 from 105 ratings.

### Do HyTools or DWSIM Simulator have ads?

Neither HyTools nor DWSIM Simulator shows ads.

### Which is updated more often, HyTools or DWSIM Simulator?

HyTools ships an update every 6 weeks, and DWSIM Simulator every 6 weeks. Most recently, HyTools was updated on September 28, 2026 and DWSIM Simulator on October 1, 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.*