# Doc Reader I vs WABCO OptiLink™

The clearest difference is price: WABCO OptiLink™ at Free against Doc Reader I's $2.99. WABCO OptiLink™ also leads on review sentiment (33% vs 7%) and iOS requirement (8.0 vs 15.6). Doc Reader I's advantage is update cadence (every 2 months vs every 47 months). On ads, in-app purchases and device support there is nothing between them.

WABCO OptiLink™ is free to download; Doc Reader I costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Doc Reader I ships an update every 2 months, WABCO OptiLink™ every 47 months. The most recent releases landed on October 5, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Doc Reader I | WABCO OptiLink™ |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/doc-reader-i/id408149544/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 7.4% of reviews | **33.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 47 months |
| Monetization | Paid | **Free** |
| Size | 3 MB | 130 MB |
| Requires iOS | 15.6 | **8.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [UMateY](https://appshunter.io/developer/327433577) | [ZF Friedrichshafen AG](https://appshunter.io/developer/993099508) |

## What reviewers say

### Doc Reader I

[App page](https://appshunter.io/ios/app/doc-reader-i/id408149544)

This app allows you to manage and read various document types directly on your iPhone, iPad, or iPod Touch. It supports downloading files from email and the web, editing, and emailing them as attachments. You can also print documents and transfer files to your desktop via iTunes.

**Highlights:** Download files from email and web, Read PDF, Word, Excel, PowerPoint, iWork, Open Office, RTF, HTML, TXT, and image files, Delete and email files, Print documents, Transfer files via iTunes

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

**In-app purchases:** none


### WABCO OptiLink™

[App page](https://appshunter.io/ios/app/wabco-optilink/id1488315281)

This app provides wireless control and monitoring of trailer functions for truck drivers and fleet operators. It offers real-time data on axle load, tire pressure, and vehicle inclination, enhancing safety and operational efficiency.

**Highlights:** Wireless trailer function control, Real-time condition monitoring, Axle load and tire pressure monitoring, Vehicle inclination alerts, Brake pad and tire temperature monitoring, Trailer suspension control, Immobilizer function

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Doc Reader I free?

Doc Reader I costs $2.99, with no in-app purchases.

### Is WABCO OptiLink™ free?

WABCO OptiLink™ is free to download, with no in-app purchases.

### Do Doc Reader I or WABCO OptiLink™ have ads?

Neither Doc Reader I nor WABCO OptiLink™ shows ads.

### Which is updated more often, Doc Reader I or WABCO OptiLink™?

Doc Reader I ships an update every 2 months, and WABCO OptiLink™ every 47 months. Most recently, Doc Reader I was updated on October 5, 2026 and WABCO OptiLink™ on October 4, 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.*