# Morse Relay vs Hydro

The clearest difference is price: Hydro at Free against Morse Relay's $0.99. Hydro also leads on update cadence (monthly vs every 4 months). Morse Relay's advantage is iOS requirement (18.0 vs 26.0). On ads, in-app purchases and device support there is nothing between them.

Hydro is free to download; Morse Relay costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Morse Relay ships an update every 4 months, Hydro monthly. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Morse Relay | Hydro |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Paid | — |
| Size | 2 MB | 9 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Echo Labs AG](https://appshunter.io/developer/1477626709) | [Patrick](https://appshunter.io/developer/385768716) |

## What reviewers say

### Morse Relay

[App page](https://appshunter.io/ios/app/morse-relay/id1409525264)

This app enables users to send and receive Morse code using their device's torch or screen. It supports app-to-app communication for encoding and decoding messages, with a visual blinking box option for devices without a torch.

**Highlights:** Send Morse code via torch, Receive Morse code via camera, Screen blinking for Morse code, App-to-app encoding/decoding, Morse code transmission

**Features:** macOS Compatibility

**In-app purchases:** none


### Hydro

[App page](https://appshunter.io/ios/app/hydro-aquatic-data-hub/id6477622181)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Morse Relay free?

Morse Relay costs $0.99, with no in-app purchases.

### Is Hydro free?

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

### Do Morse Relay or Hydro have ads?

Neither Morse Relay nor Hydro shows ads.

### Which is updated more often, Morse Relay or Hydro?

Morse Relay ships an update every 4 months, and Hydro monthly. Most recently, Morse Relay was updated on November 2, 2026 and Hydro on October 30, 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.*