# TrailerWatchDog vs Pro

The clearest difference is iOS requirement: Pro at 12.0 against TrailerWatchDog's 16. On price, rating, ratings volume and update cadence 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 TrailerWatchDog against 5.0 for Pro. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 4, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | TrailerWatchDog | Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/trailerwatchdog/id6474664454/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/pro-guide-ev/id6648759979/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free | Free |
| Size | 5 MB | 69 MB |
| Requires iOS | 16 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TrailerWatchDog LLC](https://appshunter.io/developer/1722228703) | [Battery Outfitters, Inc](https://appshunter.io/developer/1643911275) |

## What reviewers say

### TrailerWatchDog

[App page](https://appshunter.io/ios/app/trailerwatchdog/id6474664454)

Monitor critical data for your trailers, including axle temperatures, tire pressure, and tire temperatures. This app works with specific monitoring systems from Trailerwatchdog.com.

**Highlights:** Axle temperature monitoring, Tire pressure monitoring, Tire temperature monitoring, Works with TWD monitoring systems, Real-time data

**Features:** macOS Compatibility

**In-app purchases:** none


### Pro

[App page](https://appshunter.io/ios/app/pro-guide-ev/id6648759979)

Monitor your battery's real-time status, including voltage, current, and internal resistance. Track historical data, compare cell performance, and receive alerts for temperature, short circuits, and voltage deviations. This system helps optimize lithium battery health and lifespan.

**Highlights:** Real-time voltage, current, power monitoring, Battery cell comparison and balance display, Cell temperature and fault warnings, Historical data charting, Bluetooth connectivity to equalizer, Alarm prompts for critical parameters

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is TrailerWatchDog free?

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

### Is Pro free?

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

### Which has better reviews, TrailerWatchDog or Pro?

TrailerWatchDog and Pro are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do TrailerWatchDog or Pro have ads?

Neither TrailerWatchDog nor Pro shows ads.

### Which is updated more often, TrailerWatchDog or Pro?

TrailerWatchDog ships an update every 2 weeks, and Pro every 2 weeks. Most recently, TrailerWatchDog was updated on October 4, 2026 and Pro on October 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.*