# C.Scope Relay vs Trailer Sentry

The clearest difference is iOS requirement: Trailer Sentry at 12.0 against C.Scope Relay's 14.0. On price, update cadence, 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.

C.Scope Relay ships an update every 3 months, Trailer Sentry every 5 months. The most recent releases landed on October 7, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | C.Scope Relay | Trailer Sentry |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 5 months |
| Size | 47 MB | 2 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [C.Scope International Limited](https://appshunter.io/developer/1308340732) | [7PSolutions, LLC](https://appshunter.io/developer/977726086) |

## What reviewers say

### C.Scope Relay

[App page](https://appshunter.io/ios/app/cscope-relay/id1073352646)

**Features:** Vision Pro support

**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 C.Scope Relay free?

C.Scope Relay 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 C.Scope Relay or Trailer Sentry have ads?

Neither C.Scope Relay nor Trailer Sentry shows ads.

### Which is updated more often, C.Scope Relay or Trailer Sentry?

C.Scope Relay ships an update every 3 months, and Trailer Sentry every 5 months. Most recently, C.Scope Relay was updated on October 7, 2026 and Trailer Sentry on October 3, 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.*