# AM vs MachBackflow

The clearest difference is in-app purchases: AM at none against MachBackflow's 3. AM also leads on device support (3 vs 1) and iOS requirement (13.0 vs 16.6). MachBackflow's advantage is update cadence (every 2 months vs every 4 months). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. MachBackflow sells 3 one-off in-app purchases. AM asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for AM against 5.0 for MachBackflow. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

AM ships an update every 4 months, MachBackflow every 2 months. The most recent releases landed on October 8, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | AM | MachBackflow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/am-fog/id1593388074/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/machbackflow/id6448785820/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 9 MB | 18 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Water Analytics, Inc](https://appshunter.io/developer/1593388076) | [WTM Solutions, LLC](https://appshunter.io/developer/1673242880) |

## What reviewers say

### AM

[App page](https://appshunter.io/ios/app/am-fog/id1593388074)

This utility app connects to a specialized probe to measure fats, oils, and grease levels. It utilizes Bluetooth Low Energy for seamless communication with the probe, providing essential data for monitoring and analysis.

**Highlights:** FOG level measurement, BLE probe communication, Data monitoring, Water analytics support

**Features:** macOS Compatibility

**In-app purchases:** none


### MachBackflow

[App page](https://appshunter.io/ios/app/machbackflow/id6448785820)

This app streamlines backflow prevention assembly testing by capturing real-time pressure readings or allowing manual entry. It automatically generates accurate reports and manages all your tests efficiently from the field.

**Highlights:** Real-time pressure capture, Supports all assembly types and procedures, Autofill property and assembly information, Accurate, error-free PDF reports, Cloud synchronization, Powerful search and filters

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Credits 10 | $24.99 | one-time |
| Credits 100 | $174.99 | one-time |
| Credits 250 | $299.99 | one-time |


## Frequently asked questions

### Is AM free?

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

### Is MachBackflow free?

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

### Which has better reviews, AM or MachBackflow?

AM and MachBackflow are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.

### Do AM or MachBackflow have ads?

Neither AM nor MachBackflow shows ads.

### Which is updated more often, AM or MachBackflow?

AM ships an update every 4 months, and MachBackflow every 2 months. Most recently, AM was updated on October 8, 2026 and MachBackflow on September 18, 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.*