# Hero911 vs Rattlegram

The clearest difference is review sentiment: Rattlegram at 90% against Hero911's 24%. Rattlegram also leads on rating (4.5 vs 3.0). Hero911's advantage is update cadence (every 2 months vs every 9 months) and iOS requirement (12.0 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, 4.5 against 3.0. Both are backed by a comparable volume of ratings — 50 and 23 respectively. Written reviews point the same way: 24% of Hero911's written reviews are positive against 90% of Rattlegram's.

Hero911 ships an update every 2 months, Rattlegram every 9 months. The most recent releases landed on July 24, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Hero911 | Rattlegram |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (50 ratings)](https://appshunter.io/ios/app/hero911/id724001857/reviews) | **[4.5 (23 ratings)](https://appshunter.io/ios/app/rattlegram/id1664526096/reviews)** |
| Number of ratings | **50** | 23 |
| Positive reviews | 23.8% of reviews | **90.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 9 months |
| Monetization | Free | Free |
| Size | 45 MB | 1 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Guard911, LLC](https://appshunter.io/developer/862725594) | [aicodix GmbH](https://appshunter.io/developer/1664526098) |

## What reviewers say

### Hero911

[App page](https://appshunter.io/ios/app/hero911/id724001857)

This app alerts law enforcement officers to active school shooting emergencies. It provides mapped locations, officer response status, and a timer, while also notifying 911 call centers. Designed for certified law enforcement and qualified retired officers.

**Highlights:** Active school shooting alerts, Mapped incident locations, Officer response tracking, Alert timer, Simultaneous 911 notification, Proximity-based alerts

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Hero911 free?

Hero911 is free to download, with no in-app purchases.

### Is Rattlegram free?

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

### Which has better reviews, Hero911 or Rattlegram?

Rattlegram is rated higher. Hero911 averages 3.0 out of 5 from 50 ratings, while Rattlegram averages 4.5 from 23 ratings.

### Do Hero911 or Rattlegram have ads?

Neither Hero911 nor Rattlegram shows ads.

### Which is updated more often, Hero911 or Rattlegram?

Hero911 ships an update every 2 months, and Rattlegram every 9 months. Most recently, Hero911 was updated on July 24, 2026 and Rattlegram on September 8, 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.*