# Instrument Toolbox vs Smart Measure Kit

The clearest difference is price: Smart Measure Kit at Free against Instrument Toolbox's $1.99. Smart Measure Kit also leads on update cadence (every 2 days vs weekly). Instrument Toolbox's advantage is in-app purchases (none vs 1) and iOS requirement (13.0 vs 15.0). On ads and device support there is nothing between them.

Smart Measure Kit is free to download; Instrument Toolbox costs $1.99 up front. Smart Measure Kit sells 1 one-off in-app purchase. Instrument Toolbox asks for nothing beyond the download.

Instrument Toolbox ships an update weekly, Smart Measure Kit every 2 days. The most recent releases landed on October 9, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Instrument Toolbox | Smart Measure Kit |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 2 days** |
| Monetization | Paid | — |
| Size | 8 MB | 22 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [立娜 王](https://appshunter.io/developer/1761096632) | [Tran Hoa](https://appshunter.io/developer/1413218457) |

## 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


### Smart Measure Kit

[App page](https://appshunter.io/ios/app/smart-measure-kit/id6745743059)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support Us - Donate Now | $1.99 | one-time |


## Frequently asked questions

### Is Instrument Toolbox free?

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

### Is Smart Measure Kit free?

Smart Measure Kit is free to download, with in-app purchases available.

### Do Instrument Toolbox or Smart Measure Kit have ads?

Neither Instrument Toolbox nor Smart Measure Kit shows ads.

### Which is updated more often, Instrument Toolbox or Smart Measure Kit?

Instrument Toolbox ships an update weekly, and Smart Measure Kit every 2 days. Most recently, Instrument Toolbox was updated on October 9, 2026 and Smart Measure Kit on October 6, 2026.

---

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