# 木木仪表 vs Instrument Toolbox

The clearest difference is price: 木木仪表 at Free against Instrument Toolbox's $1.99. 木木仪表 also leads on iOS requirement (8.0 vs 13.0). Instrument Toolbox's advantage is update cadence (weekly vs every 5 months). On ads, in-app purchases and device support there is nothing between them.

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

木木仪表 ships an update every 5 months, Instrument Toolbox weekly. The most recent releases landed on November 2, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | 木木仪表 | Instrument Toolbox |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Weekly** |
| Monetization | — | Paid |
| Size | 17 MB | 8 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [海林 严](https://appshunter.io/developer/1499873859) | [立娜 王](https://appshunter.io/developer/1761096632) |

## What reviewers say

### 木木仪表

[App page](https://appshunter.io/ios/app/id1364764889)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is 木木仪表 free?

木木仪表 is free to download, with no in-app purchases.

### Is Instrument Toolbox free?

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

### Do 木木仪表 or Instrument Toolbox have ads?

Neither 木木仪表 nor Instrument Toolbox shows ads.

### Which is updated more often, 木木仪表 or Instrument Toolbox?

木木仪表 ships an update every 5 months, and Instrument Toolbox weekly. Most recently, 木木仪表 was updated on November 2, 2026 and Instrument Toolbox on November 8, 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.*