# iSignatureSuite vs RF calculator & Smith Chart

The clearest difference is in-app purchases: iSignatureSuite at none against RF calculator & Smith Chart's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. RF calculator & Smith Chart sells 1 one-off in-app purchase. iSignatureSuite asks for nothing beyond the download.

iSignatureSuite ships an update every 6 months, RF calculator & Smith Chart every 4 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | iSignatureSuite | RF calculator & Smith Chart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/rf-calculator-and-smith-chart/id6757265018/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 4 months** |
| Size | 13 MB | 31 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [StepOver International GmbH](https://appshunter.io/developer/979581571) | [Anas Abubakar](https://appshunter.io/developer/1581534101) |

## What reviewers say

### iSignatureSuite

[App page](https://appshunter.io/ios/app/isignaturesuite/id979581572)

**Features:** Vision Pro support

**In-app purchases:** none


### RF calculator & Smith Chart

[App page](https://appshunter.io/ios/app/rf-calculator-and-smith-chart/id6757265018)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| upgrade to pro | $5.99 | one-time |


## Frequently asked questions

### Is iSignatureSuite free?

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

### Is RF calculator & Smith Chart free?

RF calculator & Smith Chart is free to download, with in-app purchases available.

### Do iSignatureSuite or RF calculator & Smith Chart have ads?

Neither iSignatureSuite nor RF calculator & Smith Chart shows ads.

### Which is updated more often, iSignatureSuite or RF calculator & Smith Chart?

iSignatureSuite ships an update every 6 months, and RF calculator & Smith Chart every 4 months. Most recently, iSignatureSuite was updated on November 1, 2026 and RF calculator & Smith Chart on November 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.*