# EngineerCalc vs Psychro Calc Pro

The clearest difference is price: Psychro Calc Pro at Free against EngineerCalc's $1.99. Psychro Calc Pro also leads on update cadence (every 2 days vs every 60 months). EngineerCalc's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

Psychro Calc Pro is free to download; EngineerCalc costs $1.99 up front. Psychro Calc Pro sells 2 in-app purchases, starting at $3.99 per month. EngineerCalc asks for nothing beyond the download.

EngineerCalc ships an update every 60 months, Psychro Calc Pro every 2 days. The most recent releases landed on October 2, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | EngineerCalc | Psychro Calc Pro |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 60 months | **Every 2 days** |
| Size | 10 MB | 23 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [oskari saarinen](https://appshunter.io/developer/1234576917) | [Mehmet Karakas](https://appshunter.io/developer/1886748581) |

## What reviewers say

### EngineerCalc

[App page](https://appshunter.io/ios/app/engineercalc/id1454820389)

**Features:** macOS Compatibility

**In-app purchases:** none


### Psychro Calc Pro

[App page](https://appshunter.io/ios/app/psychro-calc-pro/id6760909140)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $3.99 | per month |
| Lifetime Premium | $9.99 | one-time |


## Frequently asked questions

### Is EngineerCalc free?

EngineerCalc costs $1.99, with no in-app purchases.

### Is Psychro Calc Pro free?

Psychro Calc Pro is free to download, with in-app purchases available.

### Do EngineerCalc or Psychro Calc Pro have ads?

Neither EngineerCalc nor Psychro Calc Pro shows ads.

### Which is updated more often, EngineerCalc or Psychro Calc Pro?

EngineerCalc ships an update every 60 months, and Psychro Calc Pro every 2 days. Most recently, EngineerCalc was updated on October 2, 2026 and Psychro Calc Pro on October 5, 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.*