# DWSIM Simulator vs Volume in Pipe

The clearest difference is in-app purchases: Volume in Pipe at none against DWSIM Simulator's 10. Volume in Pipe also leads on rating (5.0 vs 4.6). DWSIM Simulator's advantage is update cadence (every 6 weeks vs every 26 months) and ratings volume (105 vs 1). On price, ads and monetization model there is nothing between them.

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

Volume in Pipe holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: DWSIM Simulator has 105 ratings behind it against 1, so its average is the more settled of the two.

DWSIM Simulator ships an update every 6 weeks, Volume in Pipe every 26 months. The most recent releases landed on September 13, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | DWSIM Simulator | Volume in Pipe |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (105 ratings)](https://appshunter.io/ios/app/dwsim-simulator/id1162110266/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/volume-in-pipe/id1582068096/reviews)** |
| Number of ratings | **105** | 1 |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 26 months |
| Monetization | Free | Free |
| Size | 106 MB | 11 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Medeiros](https://appshunter.io/developer/1091004600) | [Kelly Gayneaux](https://appshunter.io/developer/1082576429) |

## 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 |


### Volume in Pipe

[App page](https://appshunter.io/ios/app/volume-in-pipe/id1582068096)

Quickly estimate the gas volume within pipes, launchers, or vessels. Input operating conditions and pipe size for an approximate volume calculation. This tool is designed for rapid field estimates.

**Highlights:** Estimate gas volume, Input operating conditions, Select pipe size, Quick field estimates, Supports iPhone

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DWSIM Simulator free?

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

### Is Volume in Pipe free?

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

### Which has better reviews, DWSIM Simulator or Volume in Pipe?

Volume in Pipe is rated higher. DWSIM Simulator averages 4.6 out of 5 from 105 ratings, while Volume in Pipe averages 5.0 from 1 ratings.

### Do DWSIM Simulator or Volume in Pipe have ads?

Neither DWSIM Simulator nor Volume in Pipe shows ads.

### Which is updated more often, DWSIM Simulator or Volume in Pipe?

DWSIM Simulator ships an update every 6 weeks, and Volume in Pipe every 26 months. Most recently, DWSIM Simulator was updated on September 13, 2026 and Volume in Pipe on September 10, 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.*