# Field Guide Wilderness Med. 4E vs Dyop Controller

The clearest difference is price: Dyop Controller at Free against Field Guide Wilderness Med. 4E's $39.99. Field Guide Wilderness Med. 4E's advantage is iOS requirement (10.0 vs 13.0). On rating, ratings volume, update cadence and ads there is nothing between them.

Dyop Controller is free to download; Field Guide Wilderness Med. 4E costs $39.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Field Guide Wilderness Med. 4E against 5.0 for Dyop Controller. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Field Guide Wilderness Med. 4E ships an update every 17 months, Dyop Controller every 16 months. The most recent releases landed on October 19, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Field Guide Wilderness Med. 4E | Dyop Controller |
| --- | --- | --- |
| Price | $39.99 | **Free** |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/field-guide-wilderness-med-4e/id713382694/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/dyop-controller/id1314361464/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 16 months** |
| Monetization | Paid | **Free** |
| Size | 286 MB | 2 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Usatine & Erickson Media LLC](https://appshunter.io/developer/1466894388) | [Shemesh Health Solutions PTY Ltd](https://appshunter.io/developer/578849338) |

## What reviewers say

### Field Guide Wilderness Med. 4E

[App page](https://appshunter.io/ios/app/field-guide-wilderness-med-4e/id713382694)

This medical guide provides fast-access solutions for wilderness emergencies, drawing from a renowned text. It offers detailed clinical information, identification aids for flora and fauna, and an intuitive interface with powerful search capabilities. All content is available offline.

**Highlights:** Wilderness emergency solutions, Identification of plants, animals, and insects, Fast-access format with signs/symptoms and treatment, Offline content access, Powerful search with word suggestions, Customizable text size, Note and bookmark creation

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

**In-app purchases:** none


### Dyop Controller

[App page](https://appshunter.io/ios/app/dyop-controller/id1314361464)

This application acts as a remote control for a vision testing application on an iPad. It enables users to manage the entire vision test, including audio feedback, from a distance.

**Highlights:** Remote control for vision test, Adjust audio feedback, Control full test remotely, Connects to iPad app, Distance control

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Field Guide Wilderness Med. 4E free?

Field Guide Wilderness Med. 4E costs $39.99, with no in-app purchases.

### Is Dyop Controller free?

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

### Which has better reviews, Field Guide Wilderness Med. 4E or Dyop Controller?

Field Guide Wilderness Med. 4E and Dyop Controller are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Field Guide Wilderness Med. 4E or Dyop Controller have ads?

Neither Field Guide Wilderness Med. 4E nor Dyop Controller shows ads.

### Which is updated more often, Field Guide Wilderness Med. 4E or Dyop Controller?

Field Guide Wilderness Med. 4E ships an update every 17 months, and Dyop Controller every 16 months. Most recently, Field Guide Wilderness Med. 4E was updated on October 19, 2026 and Dyop Controller on October 20, 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.*