# Nice Flow vs Instrument Toolbox

The clearest difference is price: Nice Flow at Free against Instrument Toolbox's $1.99. Nice Flow also leads on iOS requirement (10.4 vs 13.0). Instrument Toolbox's advantage is update cadence (weekly vs every 2 months). On ads, in-app purchases and device support there is nothing between them.

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

Nice Flow ships an update every 2 months, Instrument Toolbox weekly. The most recent releases landed on October 3, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Nice Flow | Instrument Toolbox |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | — | Paid |
| Size | 108 MB | 8 MB |
| Requires iOS | **10.4** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AZ Instrument Corp.](https://appshunter.io/developer/1442030761) | [立娜 王](https://appshunter.io/developer/1761096632) |

## What reviewers say

### Nice Flow

[App page](https://appshunter.io/ios/app/nice-flow/id1445113728)

**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 Nice Flow free?

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

### Is Instrument Toolbox free?

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

### Do Nice Flow or Instrument Toolbox have ads?

Neither Nice Flow nor Instrument Toolbox shows ads.

### Which is updated more often, Nice Flow or Instrument Toolbox?

Nice Flow ships an update every 2 months, and Instrument Toolbox weekly. Most recently, Nice Flow was updated on October 3, 2026 and Instrument Toolbox on September 23, 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.*