# Stealth Hydro Data vs Odessa Alerting

Stealth Hydro Data and Odessa Alerting are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Stealth Hydro Data ships an update every 41 months, Odessa Alerting every 20 months. The most recent releases landed on September 14, 2026 and June 9, 2026 respectively.

## The numbers

| Metric | Stealth Hydro Data | Odessa Alerting |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (3 ratings)](https://appshunter.io/ios/app/odessa-alerting/id1574220844/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 20 months** |
| Monetization | — | Free |
| Size | 8 MB | 67 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [JM Test Systems Inc.](https://appshunter.io/developer/1477078443) | [Mach Alert, Inc.](https://appshunter.io/developer/1472612618) |

## What reviewers say

### Stealth Hydro Data

[App page](https://appshunter.io/ios/app/stealth-hydro-data/id1492354898)

**Features:** macOS Compatibility

**In-app purchases:** none


### Odessa Alerting

[App page](https://appshunter.io/ios/app/odessa-alerting/id1574220844)

This application provides advanced fire station alerting functionality for public safety answering points and fire/EMS facilities. It aims to minimize dispatch time and maximize critical information delivery to first responders through tones, voice, and customizable options.

**Highlights:** State-of-the-art alerting functionality, Reliable dispatch for public safety, Maximizes critical information delivery, Tones and voice alerts, Robust add-ons and customization

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Stealth Hydro Data free?

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

### Is Odessa Alerting free?

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

### Do Stealth Hydro Data or Odessa Alerting have ads?

Neither Stealth Hydro Data nor Odessa Alerting shows ads.

### Which is updated more often, Stealth Hydro Data or Odessa Alerting?

Stealth Hydro Data ships an update every 41 months, and Odessa Alerting every 20 months. Most recently, Stealth Hydro Data was updated on September 14, 2026 and Odessa Alerting on June 9, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*