# iSmith vs Electrical & Solar Calculator

The clearest difference is in-app purchases: iSmith at none against Electrical & Solar Calculator's 1. iSmith also leads on update cadence (every 2 days vs weekly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Electrical & Solar Calculator sells 1 one-off in-app purchase. iSmith asks for nothing beyond the download.

iSmith ships an update every 2 days, Electrical & Solar Calculator weekly. The most recent releases landed on October 8, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | iSmith | Electrical & Solar Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ismith/id6444874930/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Weekly |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 7 MB | 32 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ryoun Chon Shin](https://appshunter.io/developer/1657565687) | [Anas Abubakar](https://appshunter.io/developer/1581534101) |

## What reviewers say

### iSmith

[App page](https://appshunter.io/ios/app/ismith/id6444874930)

This app helps users understand impedance matching principles. It allows for reading key network parameters from a Smith chart and calculating various matching networks and pads. Users can also convert between different power and voltage units.

**Highlights:** Read Smith chart parameters (Z, Y, VSWR, Q, Gamma), Calculate 8 L-matching networks, Calculate T & Pi matching pads, Set matching targets on Smith chart, Learn impedance matching principles, dBm, Watts, and Volts conversion, VSWR conversion

**Features:** macOS Compatibility

**In-app purchases:** none


### Electrical & Solar Calculator

[App page](https://appshunter.io/ios/app/electrical-and-solar-calculator/id6743133160)

This app provides a suite of tools for electricians, engineers, and solar installers to quickly solve common electrical design and installation problems. It covers wire sizing, voltage drop, circuit breaker sizing, motor calculations, and solar system planning.

**Highlights:** Resistor, capacitor, and inductor circuit calculations, Wire sizing and voltage drop analysis, Circuit breaker and transformer sizing, Motor wiring and power factor correction, Solar system planning tools, Customizable units (metric/imperial)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro ID | $2.99 | one-time |


## Frequently asked questions

### Is iSmith free?

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

### Is Electrical & Solar Calculator free?

Electrical & Solar Calculator is free to download, with in-app purchases available.

### Do iSmith or Electrical & Solar Calculator have ads?

Both iSmith and Electrical & Solar Calculator show ads.

### Which is updated more often, iSmith or Electrical & Solar Calculator?

iSmith ships an update every 2 days, and Electrical & Solar Calculator weekly. Most recently, iSmith was updated on October 8, 2026 and Electrical & Solar Calculator on October 22, 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.*