# DigiDecoder vs RF Calc JP

The clearest difference is iOS requirement: DigiDecoder at 17.0 against RF Calc JP's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. DigiDecoder sells 3 in-app purchases, starting at $2.99 per month and RF Calc JP sells 1 in-app purchase, starting at $0.99 per year. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 6 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | DigiDecoder | RF Calc JP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (8 ratings)](https://appshunter.io/ios/app/digidecoder-ham-radio/id6759073503/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 days | Every 6 days |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 4 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lukasz Skierkowski](https://appshunter.io/developer/1280847319) | [Hashimoto Yoshikazu](https://appshunter.io/developer/6790925881) |

## What reviewers say

### DigiDecoder

[App page](https://appshunter.io/ios/app/digidecoder-ham-radio/id6759073503)

This application decodes and encodes various ham radio digital modes in real-time. It automatically recognizes signals, displays them with an animated waterfall, and supports sending SSTV images, CW, FT8, and Packet messages.

**Highlights:** Real-time digital mode decoding, Automatic signal recognition, Animated waterfall display, SSTV image encoding, CW, FT8, and Packet message encoding, Bluetooth and network TNC support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DigiDecoder Monthly | $2.99 | per month |
| DigiDecoder Trial | Free | one-time |
| DigiDecoder Lifetime | $8.99 | one-time |


### RF Calc JP

[App page](https://appshunter.io/ios/app/rf-calc-jp/id6815598081)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RF Calc JP Pro (Yearly) | $0.99 | per year |


## Frequently asked questions

### Is DigiDecoder free?

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

### Is RF Calc JP free?

RF Calc JP is free to download, with in-app purchases available.

### Do DigiDecoder or RF Calc JP have ads?

Neither DigiDecoder nor RF Calc JP shows ads.

### Which is updated more often, DigiDecoder or RF Calc JP?

DigiDecoder ships an update every 6 days, and RF Calc JP every 6 days. Most recently, DigiDecoder was updated on October 28, 2026 and RF Calc JP on October 24, 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.*