# Diagnosis vs TRL TPMS

The clearest difference is update cadence: TRL TPMS at weekly against Diagnosis's monthly. Diagnosis's advantage is iOS requirement (8.0 vs 12.2). 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.

Diagnosis ships an update monthly, TRL TPMS weekly. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Diagnosis | TRL TPMS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Size | 550 MB | 60 MB |
| Requires iOS | **8.0** | 12.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [翔宇 金](https://appshunter.io/developer/528881861) | [TRAILER RESOURCES LIMITED](https://appshunter.io/developer/1727339326) |

## What reviewers say

### Diagnosis

[App page](https://appshunter.io/ios/app/diagnosis/id1517729194)

**Features:** macOS Compatibility

**In-app purchases:** none


### TRL TPMS

[App page](https://appshunter.io/ios/app/trl-tpms/id6476616680)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Diagnosis free?

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

### Is TRL TPMS free?

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

### Do Diagnosis or TRL TPMS have ads?

Neither Diagnosis nor TRL TPMS shows ads.

### Which is updated more often, Diagnosis or TRL TPMS?

Diagnosis ships an update monthly, and TRL TPMS weekly. Most recently, Diagnosis was updated on October 29, 2026 and TRL TPMS on October 25, 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.*