# Instrument Toolbox vs Simple Zakat

The clearest difference is price: Simple Zakat at Free against Instrument Toolbox's $1.99. Instrument Toolbox's advantage is update cadence (weekly vs fortnightly). On review sentiment, ads, in-app purchases and device support there is nothing between them.

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

Instrument Toolbox ships an update weekly, Simple Zakat fortnightly. The most recent releases landed on November 8, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Instrument Toolbox | Simple Zakat |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/simple-zakat/id6753765718/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | Paid | **Free** |
| Size | 8 MB | 35 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [立娜 王](https://appshunter.io/developer/1761096632) | [Syed Muhammad Talha](https://appshunter.io/developer/1844895111) |

## 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


### Simple Zakat

[App page](https://appshunter.io/ios/app/simple-zakat/id6753765718)

Calculate your annual Zakat accurately using authentic Islamic principles. Track payments across multiple Hijri years and maintain complete financial privacy with local data storage. Offers smart reminders and multi-currency support for a seamless experience.

**Highlights:** Accurate Zakat calculation, Hijri calendar integration, Payment tracking, Complete privacy (local storage), Smart reminders, Multi-currency support, Offline functionality

**In-app purchases:** none


## Frequently asked questions

### Is Instrument Toolbox free?

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

### Is Simple Zakat free?

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

### Do Instrument Toolbox or Simple Zakat have ads?

Neither Instrument Toolbox nor Simple Zakat shows ads.

### Which is updated more often, Instrument Toolbox or Simple Zakat?

Instrument Toolbox ships an update weekly, and Simple Zakat fortnightly. Most recently, Instrument Toolbox was updated on November 8, 2026 and Simple Zakat on October 30, 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.*