# Rattlegram vs SharkRF Link

The clearest difference is review sentiment: Rattlegram at 90% against SharkRF Link's 19%. Rattlegram also leads on rating (4.6 vs 2.4). SharkRF Link's advantage is update cadence (every 3 weeks vs every 9 months) and iOS requirement (9.0 vs 17.6). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Rattlegram holds the better App Store score, 4.6 against 2.4. Both are backed by a comparable volume of ratings — 28 and 30 respectively. Written reviews point the same way: 90% of Rattlegram's written reviews are positive against 19% of SharkRF Link's.

Rattlegram ships an update every 9 months, SharkRF Link every 3 weeks. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Rattlegram | SharkRF Link |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (28 ratings)](https://appshunter.io/ios/app/rattlegram/id1664526096/reviews)** | [2.4 (30 ratings)](https://appshunter.io/ios/app/sharkrf-link/id6444303804/reviews) |
| Number of ratings | 28 | **30** |
| Positive reviews | **90.0% of reviews** | 19.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 1 MB | 18 MB |
| Requires iOS | 17.6 | **9.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [aicodix GmbH](https://appshunter.io/developer/1664526098) | [SharkRF OU](https://appshunter.io/developer/1653736857) |

## What reviewers say

### Rattlegram

[App page](https://appshunter.io/ios/app/rattlegram/id1664526096)

This app utilizes advanced COFDM technology for audio-based SMS transmission. It supports various modes with specific encoding and modulation techniques, requiring minimal bandwidth for efficient data transfer.

**Highlights:** COFDM technology, Audio-based SMS, 160 ms OFDM symbols, Differential PSK modulation, Forward error correction, Low bandwidth requirement

**In-app purchases:** none


### SharkRF Link

[App page](https://appshunter.io/ios/app/sharkrf-link/id6444303804)

Access the management web interface for your SharkRF devices using their unique identifiers. This application also functions as a transceiver for compatible devices.

**Highlights:** Open device web interface, Use device UIDs, Transceiver functionality, Beta version access

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Rattlegram free?

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

### Is SharkRF Link free?

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

### Which has better reviews, Rattlegram or SharkRF Link?

Rattlegram is rated higher. Rattlegram averages 4.6 out of 5 from 28 ratings, while SharkRF Link averages 2.4 from 30 ratings.

### Do Rattlegram or SharkRF Link have ads?

Neither Rattlegram nor SharkRF Link shows ads.

### Which is updated more often, Rattlegram or SharkRF Link?

Rattlegram ships an update every 9 months, and SharkRF Link every 3 weeks. Most recently, Rattlegram was updated on October 24, 2026 and SharkRF Link on October 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.*