# SYSDO vs Trailer Sentry

The clearest difference is update cadence: SYSDO at every 2 months against Trailer Sentry's every 5 months. On price, ads, in-app purchases and device support there is nothing between them.

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

SYSDO ships an update every 2 months, Trailer Sentry every 5 months. The most recent releases landed on May 18, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | SYSDO | Trailer Sentry |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Size | 12 MB | 2 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [EuroSat CS spol.s r.o.](https://appshunter.io/developer/522371771) | [7PSolutions, LLC](https://appshunter.io/developer/977726086) |

## What reviewers say

### SYSDO

[App page](https://appshunter.io/ios/app/sysdo/id1149257322)

**In-app purchases:** none


### Trailer Sentry

[App page](https://appshunter.io/ios/app/trailer-sentry/id1221831418)

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

**In-app purchases:** none


## Frequently asked questions

### Is SYSDO free?

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

### Is Trailer Sentry free?

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

### Do SYSDO or Trailer Sentry have ads?

Neither SYSDO nor Trailer Sentry shows ads.

### Which is updated more often, SYSDO or Trailer Sentry?

SYSDO ships an update every 2 months, and Trailer Sentry every 5 months. Most recently, SYSDO was updated on May 18, 2026 and Trailer Sentry on September 16, 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.*