# BasicATTCalc vs iSmith

The clearest difference is price: iSmith at Free against BasicATTCalc's $1.99. iSmith also leads on update cadence (every 2 days vs every 29 months). BasicATTCalc's advantage is ads (none vs shown) and iOS requirement (14.5 vs 16.0). On in-app purchases and device support there is nothing between them.

iSmith is free to download; BasicATTCalc costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

BasicATTCalc ships an update every 29 months, iSmith every 2 days. The most recent releases landed on September 20, 2026 and June 6, 2026 respectively.

## The numbers

| Metric | BasicATTCalc | iSmith |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ismith/id6444874930/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 29 months | **Every 2 days** |
| Monetization | — | Ad-supported |
| Size | 7 MB | 7 MB |
| Requires iOS | **14.5** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TAKAHIKO FUKUYAMA](https://appshunter.io/developer/857468511) | [Ryoun Chon Shin](https://appshunter.io/developer/1657565687) |

## What reviewers say

### BasicATTCalc

[App page](https://appshunter.io/ios/app/basicattcalc/id947238679)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is BasicATTCalc free?

BasicATTCalc costs $1.99, with no in-app purchases.

### Is iSmith free?

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

### Do BasicATTCalc or iSmith have ads?

iSmith shows ads; BasicATTCalc does not.

### Which is updated more often, BasicATTCalc or iSmith?

BasicATTCalc ships an update every 29 months, and iSmith every 2 days. Most recently, BasicATTCalc was updated on September 20, 2026 and iSmith on June 6, 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.*