# Ems Response Tracker 2 vs Reverse Flow

The clearest difference is in-app purchases: Ems Response Tracker 2 at none against Reverse Flow's 4. Ems Response Tracker 2 also leads on iOS requirement (13.0 vs 15.0). Reverse Flow's advantage is update cadence (weekly vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Reverse Flow sells 4 in-app purchases, starting at $2.99 per month. Ems Response Tracker 2 asks for nothing beyond the download.

Ems Response Tracker 2 ships an update monthly, Reverse Flow weekly. The most recent releases landed on September 16, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Ems Response Tracker 2 | Reverse Flow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/reverse-flow-fire-hydraulics/id6775030535/reviews)** |
| Number of ratings | — | **5** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | — | Free |
| Size | 25 MB | 8 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Francois Marais](https://appshunter.io/developer/1895170301) | [DEREK ANDREW MURDOCK](https://appshunter.io/developer/6775030537) |

## What reviewers say

### Ems Response Tracker 2

[App page](https://appshunter.io/ios/app/ems-response-tracker-2/id6763120971)

**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 (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reverse Flow Monthly Support $3 | $2.99 | per month |
| Reverse Flow Monthly Support $10 | $9.99 | per month |
| Reverse Flow One-Time Support $5 | $4.99 | one-time |
| Reverse Flow Pro | $4.99 | one-time |


## Frequently asked questions

### Is Ems Response Tracker 2 free?

Ems Response Tracker 2 is free to download, with no in-app purchases.

### Is Reverse Flow free?

Reverse Flow is free to download, with in-app purchases available.

### Do Ems Response Tracker 2 or Reverse Flow have ads?

Neither Ems Response Tracker 2 nor Reverse Flow shows ads.

### Which is updated more often, Ems Response Tracker 2 or Reverse Flow?

Ems Response Tracker 2 ships an update monthly, and Reverse Flow weekly. Most recently, Ems Response Tracker 2 was updated on September 16, 2026 and Reverse Flow on September 14, 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.*