# ePerf vs DocuNet Viewer

The clearest difference is rating: ePerf at 3.0 against DocuNet Viewer's 1.0. DocuNet Viewer's advantage is device support (3 vs 1). On price, ratings volume, update cadence and ads there is nothing between them.

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

ePerf holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

ePerf ships an update every 2 months, DocuNet Viewer every 6 weeks. The most recent releases landed on July 17, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | ePerf | DocuNet Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/eperf/id586166665/reviews)** | [1.0 (4 ratings)](https://appshunter.io/ios/app/docunet-viewer/id857810655/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | — | 7.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 53 MB | 166 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [EMBRAER S.A.](https://appshunter.io/developer/507436833) | [Vistair Systems Ltd](https://appshunter.io/developer/478879616) |

## What reviewers say

### ePerf

[App page](https://appshunter.io/ios/app/eperf/id586166665)

This application provides pilots with real-time aircraft performance calculations for any flight phase, offline. It aims to reduce cockpit workload, save fuel through takeoff thrust optimization, and eliminate paper-based materials for a more economical and efficient flight operation.

**Highlights:** Offline flight performance calculations, Takeoff and landing performance, Reduced paper cockpit materials, Engine savings through thrust optimization, Quick performance calculations, Support for Embraer Commercial aircraft

**In-app purchases:** none


### DocuNet Viewer

[App page](https://appshunter.io/ios/app/docunet-viewer/id857810655)

Access flight operations manuals offline on your iPad. This app provides fast, intelligent searching, bookmarking, and filtering for your entire manual library, ensuring you always have the latest information from all manufacturers.

**Highlights:** Offline manual access, Tabbed multi-document viewing, Fast intelligent searching, Bookmarking, MSN/audience filtering, Layered manuals, Automatic updates

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

**In-app purchases:** none


## Frequently asked questions

### Is ePerf free?

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

### Is DocuNet Viewer free?

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

### Which has better reviews, ePerf or DocuNet Viewer?

ePerf is rated higher. ePerf averages 3.0 out of 5 from 2 ratings, while DocuNet Viewer averages 1.0 from 4 ratings.

### Do ePerf or DocuNet Viewer have ads?

Neither ePerf nor DocuNet Viewer shows ads.

### Which is updated more often, ePerf or DocuNet Viewer?

ePerf ships an update every 2 months, and DocuNet Viewer every 6 weeks. Most recently, ePerf was updated on July 17, 2026 and DocuNet Viewer on September 8, 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.*