# HazMatIQ.app vs Reverse Flow

The clearest difference is update cadence: Reverse Flow at weekly against HazMatIQ.app's every 2 months. Reverse Flow also leads on ratings volume (5 vs 1). On price, rating, 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.

On the App Store both sit at effectively the same score — 5.0 for HazMatIQ.app against 5.0 for Reverse Flow. That said, the two scores are not equally well evidenced: Reverse Flow has 5 ratings behind it against 1, so its average is the more settled of the two.

HazMatIQ.app ships an update every 2 months, Reverse Flow weekly. The most recent releases landed on November 5, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | HazMatIQ.app | Reverse Flow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/hazmatiqapp/id6755795895/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/reverse-flow-fire-hydraulics/id6775030535/reviews) |
| Number of ratings | 1 | **5** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free | Free |
| Size | 6 MB | 8 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Drew Toma](https://appshunter.io/developer/6820180626) | [DEREK ANDREW MURDOCK](https://appshunter.io/developer/6775030537) |

## What reviewers say

### HazMatIQ.app

[App page](https://appshunter.io/ios/app/hazmatiqapp/id6755795895)

This offline companion app assists trained emergency responders in applying the HazMatIQ system during hazardous materials incidents. It offers rapid access to crucial decision-support information via a streamlined interface, ensuring reliability without internet connectivity.

**Highlights:** Offline functionality, Decision-support information, Streamlined interface, Real-world reliability, Companion resource for trained responders

**Features:** macOS Compatibility

**In-app purchases:** none


### Reverse Flow

[App page](https://appshunter.io/ios/app/reverse-flow-fire-hydraulics/id6775030535)

This professional fireground hydraulics platform assists firefighters and pump operators in calculating complex flow rates, pump discharge pressures, and relay pumping requirements. It supports various nozzle types and allows for custom hose coefficients and elevation adjustments for accurate operational planning and decision support.

**Highlights:** Reverse Flow calculations, Required PDP calculations, Relay Pumping calculations, Split Lay analysis, Pump Chart storage, Nozzle support, Custom hose coefficients

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

**In-app purchases:** none


## Frequently asked questions

### Is HazMatIQ.app free?

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

### Is Reverse Flow free?

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

### Which has better reviews, HazMatIQ.app or Reverse Flow?

HazMatIQ.app and Reverse Flow are both rated 5.0 out of 5 on the App Store, from 1 and 5 ratings respectively.

### Do HazMatIQ.app or Reverse Flow have ads?

Neither HazMatIQ.app nor Reverse Flow shows ads.

### Which is updated more often, HazMatIQ.app or Reverse Flow?

HazMatIQ.app ships an update every 2 months, and Reverse Flow weekly. Most recently, HazMatIQ.app was updated on November 5, 2026 and Reverse Flow on November 10, 2026.

---

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