# Feld Hellschreiber vs Odmaster

The clearest difference is review sentiment: Feld Hellschreiber at 75% against Odmaster's 29%. Feld Hellschreiber also leads on iOS requirement (6.0 vs 14.0). Odmaster's advantage is price (Free vs $2.99) and rating (3.8 vs 2.8). On ads, in-app purchases and device support there is nothing between them.

Odmaster is free to download; Feld Hellschreiber costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Odmaster holds the better App Store score, 3.8 against 2.8. That said, the two scores are not equally well evidenced: Odmaster has 1.1K ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 75% of Feld Hellschreiber's written reviews are positive against 29% of Odmaster's, so the app with the better star average is not the one people write more warmly about.

Feld Hellschreiber ships an update every 13 months, Odmaster every 3 weeks. The most recent releases landed on October 8, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Feld Hellschreiber | Odmaster |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [2.8 (5 ratings)](https://appshunter.io/ios/app/feld-hellschreiber/id650758963/reviews) | **[3.8 (1.1K ratings)](https://appshunter.io/ios/app/odmaster/id1512532413/reviews)** |
| Number of ratings | 5 | **1.1K** |
| Positive reviews | **75.0% of reviews** | 28.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 3 weeks** |
| Monetization | Paid | **Free** |
| Size | 4 MB | 96 MB |
| Requires iOS | **6.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Black Cat Systems](https://appshunter.io/developer/301047032) | [Guangzhou Billion Leiden Electronic Technology Co., Ltd.](https://appshunter.io/developer/1512532412) |

## What reviewers say

### Feld Hellschreiber

[App page](https://appshunter.io/ios/app/feld-hellschreiber/id650758963)

This app decodes and transmits text messages using the historical Hellschreiber system, which sends characters as audio signals. It's ideal for amateur radio operators and enthusiasts interested in vintage communication methods. The app allows for both manual text entry and pre-set messages, with adjustable display contrast for optimal viewing.

**Highlights:** Decode Hellschreiber messages, Transmit text messages, Canned text message support, Adjustable display contrast, Real-time text scrolling, Audio input/output via device mic/speaker

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

**In-app purchases:** none


### Odmaster

[App page](https://appshunter.io/ios/app/odmaster/id1512532413)

This application allows users to program various radio models directly from their mobile phones, eliminating the need for a computer. It offers a convenient and portable solution for radio programming and includes a community feature for sharing content and interacting with other users.

**Highlights:** Program radio with mobile phone, Supports multiple radio models, Convenient and portable programming, Community sharing and interaction, Help Center and direct support

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Convenient mobile programming
- 💡 Helpful community features

**What reviewers complain about**

- 🐛 Frequent crashes and bugs
- 🔒 Poor account registration process
- 🔋 High battery drain
- 👎 Unreliable Bluetooth connectivity

**Reported bugs**

- Unable to read or write radio data
- Inconsistent behavior across iOS versions
- Login and account issues

**Requested features**

- Support for more radio models
- Ability to save and load custom channel configurations
- Improved user interface and navigation


## Frequently asked questions

### Is Feld Hellschreiber free?

Feld Hellschreiber costs $2.99, with no in-app purchases.

### Is Odmaster free?

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

### Which has better reviews, Feld Hellschreiber or Odmaster?

Odmaster is rated higher. Feld Hellschreiber averages 2.8 out of 5 from 5 ratings, while Odmaster averages 3.8 from 1.1K ratings.

### Do Feld Hellschreiber or Odmaster have ads?

Neither Feld Hellschreiber nor Odmaster shows ads.

### Which is updated more often, Feld Hellschreiber or Odmaster?

Feld Hellschreiber ships an update every 13 months, and Odmaster every 3 weeks. Most recently, Feld Hellschreiber was updated on October 8, 2026 and Odmaster on October 13, 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.*