# Rule of Three Calculator vs FT8 Decoder

The clearest difference is review sentiment: FT8 Decoder at 50% against Rule of Three Calculator's 0%. FT8 Decoder also leads on rating (4.3 vs 2.3) and in-app purchases (none vs 1). Rule of Three Calculator's advantage is price (Free vs $1.99) and iOS requirement (8.0 vs 15.4). On ratings volume, ads and device support there is nothing between them.

Rule of Three Calculator is free to download; FT8 Decoder costs $1.99 up front. Rule of Three Calculator sells 1 one-off in-app purchase. FT8 Decoder asks for nothing beyond the download.

FT8 Decoder holds the better App Store score, 4.3 against 2.3. Both are backed by a comparable volume of ratings — 4 and 8 respectively. Written reviews point the same way: 0% of Rule of Three Calculator's written reviews are positive against 50% of FT8 Decoder's.

## The numbers

| Metric | Rule of Three Calculator | FT8 Decoder |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [2.3 (4 ratings)](https://appshunter.io/ios/app/rule-of-three-calculator/id1185318300/reviews) | **[4.3 (8 ratings)](https://appshunter.io/ios/app/ft8-decoder/id1592847401/reviews)** |
| Number of ratings | 4 | **8** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | — | Every 18 months |
| Monetization | **Free** | Paid |
| Size | 16 MB | 1 MB |
| Requires iOS | **8.0** | 15.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Saran Dumronggittigule](https://appshunter.io/developer/1083622848) | [HotPaw Productions](https://appshunter.io/developer/285074853) |

## What reviewers say

### Rule of Three Calculator

[App page](https://appshunter.io/ios/app/rule-of-three-calculator/id1185318300)

This utility app helps you solve problems involving ratios and proportions. It calculates an unknown number based on the relationship between two other known numbers.

**Highlights:** Ratio calculation, Proportion solving, Finds unknown numbers, Simple interface

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


### FT8 Decoder

[App page](https://appshunter.io/ios/app/ft8-decoder/id1592847401)

This application decodes FT8 digital signals from amateur radio bands. It can process audio from external sources or directly from an SSB radio or SDR. The app also generates FT8 modulated audio for experimentation.

**Highlights:** Decodes FT8 8FSK modulated signals, Processes external audio or SDR sound, Supports standard callsigns and 13-character messages, Generates FT8 message audio, Experiment with sending and receiving FT8 audio

**In-app purchases:** none


## Frequently asked questions

### Is Rule of Three Calculator free?

Rule of Three Calculator is free to download, with in-app purchases available.

### Is FT8 Decoder free?

FT8 Decoder costs $1.99, with no in-app purchases.

### Which has better reviews, Rule of Three Calculator or FT8 Decoder?

FT8 Decoder is rated higher. Rule of Three Calculator averages 2.3 out of 5 from 4 ratings, while FT8 Decoder averages 4.3 from 8 ratings.

### Do Rule of Three Calculator or FT8 Decoder have ads?

Neither Rule of Three Calculator nor FT8 Decoder shows ads.

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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.*