# SkyNotes App vs RF calculator & Smith Chart

The clearest difference is update cadence: RF calculator & Smith Chart at every 4 months against SkyNotes App's every 9 months. RF calculator & Smith Chart also leads on iOS requirement (15.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. SkyNotes App sells 6 in-app purchases, starting at $8.99 per month and RF calculator & Smith Chart sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

SkyNotes App ships an update every 9 months, RF calculator & Smith Chart every 4 months. The most recent releases landed on October 28, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | SkyNotes App | RF calculator & Smith Chart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/skynotes-app/id6745104047/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 months** |
| Monetization | Freemium | — |
| Size | 168 MB | 31 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ricardo Serrano](https://appshunter.io/developer/1807333244) | [Anas Abubakar](https://appshunter.io/developer/1581534101) |

## What reviewers say

### SkyNotes App

[App page](https://appshunter.io/ios/app/skynotes-app/id6745104047)

Effortlessly convert voice notes and audio from videos into searchable text. This app offers AI-powered summaries, action item extraction, and flexible export options. Organize your thoughts and information with a clean interface and convenient widgets.

**Highlights:** One-tap voice recording, On-device and cloud transcription, AI-powered summaries and action items, Video and YouTube audio import, Variable playback speed, Export transcripts to PDF, Home Screen widget

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SkyNotes App Premium Monthly | $8.99 | per month |
| SkyNotes Premium Plus Monthly | $15.99 | per month |
| SkyNotes Enterprise Monthly | $49.00 | per month |
| SkyNotes App Premium Yearly | $79.99 | per year |
| SkyNotes Premium Plus Yearly | $159.99 | per year |
| SkyNotes Enterprise Yearly | $489.99 | per year |


### 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 | $3.99 | one-time |


## Frequently asked questions

### Is SkyNotes App free?

SkyNotes App is free to download, with in-app purchases available.

### Is RF calculator & Smith Chart free?

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

### Do SkyNotes App or RF calculator & Smith Chart have ads?

Neither SkyNotes App nor RF calculator & Smith Chart shows ads.

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

SkyNotes App ships an update every 9 months, and RF calculator & Smith Chart every 4 months. Most recently, SkyNotes App was updated on October 28, 2026 and RF calculator & Smith Chart 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.*