# Process & Control Engineering vs PSSI

The clearest difference is update cadence: PSSI at every 2 days against Process & Control Engineering's every 7 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Process & Control Engineering ships an update every 7 months, PSSI every 2 days. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Process & Control Engineering | PSSI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 days** |
| Size | 31 MB | 135 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Datateam Business Media Ltd](https://appshunter.io/developer/531755760) | [Evan Richardson](https://appshunter.io/developer/1727360047) |

## What reviewers say

### Process & Control Engineering

[App page](https://appshunter.io/ios/app/process-and-control-engineering/id973151584)

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

**In-app purchases:** none


### PSSI

[App page](https://appshunter.io/ios/app/pssi/id6499057790)

**In-app purchases:** none


## Frequently asked questions

### Is Process & Control Engineering free?

Process & Control Engineering is free to download, with no in-app purchases.

### Is PSSI free?

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

### Do Process & Control Engineering or PSSI have ads?

Neither Process & Control Engineering nor PSSI shows ads.

### Which is updated more often, Process & Control Engineering or PSSI?

Process & Control Engineering ships an update every 7 months, and PSSI every 2 days. Most recently, Process & Control Engineering was updated on November 1, 2026 and PSSI on November 4, 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.*