# Instrument Toolbox vs GenPass

The clearest difference is price: GenPass at Free against Instrument Toolbox's $1.99. Instrument Toolbox's advantage is ads (none vs shown) and iOS requirement (13.0 vs 26.0). On update cadence, in-app purchases and device support there is nothing between them.

GenPass is free to download; Instrument Toolbox costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 9, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Instrument Toolbox | GenPass |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Weekly | Weekly |
| Monetization | Paid | — |
| Size | 8 MB | 8 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [立娜 王](https://appshunter.io/developer/1761096632) | [MIZOU, CO., LTD.](https://appshunter.io/developer/1542553141) |

## What reviewers say

### Instrument Toolbox

[App page](https://appshunter.io/ios/app/instrument-toolbox/id6698856248)

A professional calculator designed for industrial control, automation, and instrumentation engineers. It offers quick conversions and calculations for gas concentration, units, steam properties, flange levels, and pipeline flow. Ideal for both field debugging and engineering design.

**Highlights:** PPM to mg/m³ conversion with compensation, Industrial unit conversion (pressure, volume, temp, etc.), Saturated steam pressure and density calculator, Flange level migration calculations, Pipeline flow and velocity calculator, Real-time calculation results

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

**In-app purchases:** none


### GenPass

[App page](https://appshunter.io/ios/app/genpass-easy-pass-generate/id6756170281)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Instrument Toolbox free?

Instrument Toolbox costs $1.99, with no in-app purchases.

### Is GenPass free?

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

### Do Instrument Toolbox or GenPass have ads?

GenPass shows ads; Instrument Toolbox does not.

### Which is updated more often, Instrument Toolbox or GenPass?

Instrument Toolbox ships an update weekly, and GenPass weekly. Most recently, Instrument Toolbox was updated on October 9, 2026 and GenPass on October 30, 2026.

---

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