# RST Decoder Pro vs learnFORTH

RST Decoder Pro and learnFORTH both sit at 5.0 stars, but that hides the real split: 100% of learnFORTH's written reviews are positive against 50% of RST Decoder Pro's. learnFORTH also leads on price (Free vs $1.99) and update cadence (every 5 days vs monthly). On rating, ads, in-app purchases and device support there is nothing between them.

learnFORTH is free to download; RST Decoder Pro costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for RST Decoder Pro against 5.0 for learnFORTH. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews are what separate them: 50% of RST Decoder Pro's written reviews are positive against 100% of learnFORTH's.

RST Decoder Pro ships an update monthly, learnFORTH every 5 days. The most recent releases landed on September 27, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | RST Decoder Pro | learnFORTH |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/rst-decoder-pro/id1521025545/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/learnforth/id6796084884/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 2 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 17+ | 4+ |
| Developer | [koji kamogawa](https://appshunter.io/developer/1488210713) | [John Kennedy](https://appshunter.io/developer/284943103) |

## What reviewers say

### RST Decoder Pro

[App page](https://appshunter.io/ios/app/rst-decoder-pro/id1521025545)

This application decodes Morse code from your device's microphone, offering two decoding methods (BPF and FFT) with adjustable parameters. It includes features like automatic frequency detection, gain control, and real-time signal display for accurate Morse code practice and reception.

**Highlights:** Microphone Morse code decoding, BPF and FFT decoding methods, Auto Frequency Detector (AFD), Auto Gain Control (AGC), Real-time CW signal display, Waterfall display (Pro version), Adjustable control parameters

**In-app purchases:** none


### learnFORTH

[App page](https://appshunter.io/ios/app/learnforth/id6796084884)

Learn the compact, stack-based Forth programming language through structured daily lessons and interactive exercises. Explore its history and applications in embedded systems and retro computing.

**Highlights:** 90 structured daily lessons, Interactive REPL with syntax highlighting, Hands-on exercises with hints, Progress tracking and daily streaks, Reverse Polish Notation primer, Historical notes on Forth dialects

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

**In-app purchases:** none


## Frequently asked questions

### Is RST Decoder Pro free?

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

### Is learnFORTH free?

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

### Which has better reviews, RST Decoder Pro or learnFORTH?

RST Decoder Pro and learnFORTH are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.

### Do RST Decoder Pro or learnFORTH have ads?

Neither RST Decoder Pro nor learnFORTH shows ads.

### Which is updated more often, RST Decoder Pro or learnFORTH?

RST Decoder Pro ships an update monthly, and learnFORTH every 5 days. Most recently, RST Decoder Pro was updated on September 27, 2026 and learnFORTH on September 21, 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.*