# DWSIM Simulator vs Flexblocks

The clearest difference is review sentiment: Flexblocks at 100% against DWSIM Simulator's 57%. Flexblocks also leads on update cadence (every 10 days vs every 6 weeks). DWSIM Simulator's advantage is rating (4.6 vs 1.0) and ads (none vs shown). On price, in-app purchases and device support there is nothing between them.

Both are free to download. DWSIM Simulator sells 10 one-off in-app purchases and Flexblocks sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

DWSIM Simulator holds the better App Store score, 4.6 against 1.0. 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. Written reviews complicate that: 57% of DWSIM Simulator's written reviews are positive against 100% of Flexblocks's, so the app with the better star average is not the one people write more warmly about.

DWSIM Simulator ships an update every 6 weeks, Flexblocks every 10 days. The most recent releases landed on September 13, 2026 and June 7, 2026 respectively.

## The numbers

| Metric | DWSIM Simulator | Flexblocks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (105 ratings)](https://appshunter.io/ios/app/dwsim-simulator/id1162110266/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/flexblocks-time-blocking/id1631938060/reviews) |
| Number of ratings | **105** | 1 |
| Positive reviews | 57.1% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 106 MB | 15 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Medeiros](https://appshunter.io/developer/1091004600) | [Andrey Bukati](https://appshunter.io/developer/657064931) |

## 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 |


### Flexblocks

[App page](https://appshunter.io/ios/app/flexblocks-time-blocking/id1631938060)

This app optimizes your day by automatically scheduling time blocks for tasks, helping you avoid procrastination and meet deadlines. It learns your best times to create a personalized schedule.

**Highlights:** Auto-scheduling for tasks, Optimizes daily schedule, Learns user's best times, Integrates with calendar, Helps meet deadlines

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $3.99 | per month |
| Special Offer | $11.49 | per year |
| Annual Plan | $46.99 | per year |


## Frequently asked questions

### Is DWSIM Simulator free?

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

### Is Flexblocks free?

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

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

DWSIM Simulator is rated higher. DWSIM Simulator averages 4.6 out of 5 from 105 ratings, while Flexblocks averages 1.0 from 1 ratings.

### Do DWSIM Simulator or Flexblocks have ads?

Flexblocks shows ads; DWSIM Simulator does not.

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

DWSIM Simulator ships an update every 6 weeks, and Flexblocks every 10 days. Most recently, DWSIM Simulator was updated on September 13, 2026 and Flexblocks on June 7, 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.*