# DWSIM Simulator vs Orbyt.

The clearest difference is in-app purchases: Orbyt. at none against DWSIM Simulator's 10. Orbyt. also leads on update cadence (daily vs every 6 weeks). DWSIM Simulator's advantage is ads (none vs shown) and device support (3 vs 1). On price there is nothing between them.

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

DWSIM Simulator ships an update every 6 weeks, Orbyt. daily. The most recent releases landed on October 1, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | DWSIM Simulator | Orbyt. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (105 ratings)](https://appshunter.io/ios/app/dwsim-simulator/id1162110266/reviews)** | — |
| Number of ratings | **105** | — |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Daily** |
| Monetization | Free | — |
| Size | 106 MB | 16 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Medeiros](https://appshunter.io/developer/1091004600) | [Utkarsh Mishra](https://appshunter.io/developer/1893719266) |

## What reviewers say

### 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 |


### Orbyt.

[App page](https://appshunter.io/ios/app/orbyt/id6762473512)

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

**In-app purchases:** none


## Frequently asked questions

### Is DWSIM Simulator free?

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

### Is Orbyt. free?

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

### Do DWSIM Simulator or Orbyt. have ads?

Orbyt. shows ads; DWSIM Simulator does not.

### Which is updated more often, DWSIM Simulator or Orbyt.?

DWSIM Simulator ships an update every 6 weeks, and Orbyt. daily. Most recently, DWSIM Simulator was updated on October 1, 2026 and Orbyt. on October 6, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*