# Instrument Toolbox vs I/E Bible

The clearest difference is price: I/E Bible at Free against Instrument Toolbox's $1.99. Instrument Toolbox's advantage is iOS requirement (13.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

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

## The numbers

| Metric | Instrument Toolbox | I/E Bible |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ie-bible/id6761774585/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | — |
| Monetization | Paid | **Free** |
| Size | 8 MB | 198 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [立娜 王](https://appshunter.io/developer/1761096632) | [Oscar Corona](https://appshunter.io/developer/1891403709) |

## 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


### I/E Bible

[App page](https://appshunter.io/ios/app/ie-bible/id6761774585)

This app provides a centralized hub for instrument calibration resources. It offers instant answers to process instrumentation questions through an integrated AI agent, streamlining calibration workflows.

**Highlights:** Instrument calibration resources, AI agent for process instrumentation, Instant answers to technical questions, Streamlined calibration workflows, Centralized resource hub

**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 I/E Bible free?

I/E Bible is free to download, with no in-app purchases.

### Do Instrument Toolbox or I/E Bible have ads?

Neither Instrument Toolbox nor I/E Bible shows ads.

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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.*