# DoD Systems Engineering vs ESF#3 Field Guide

The clearest difference is update cadence: ESF#3 Field Guide at every 2 weeks against DoD Systems Engineering's every 5 months. ESF#3 Field Guide also leads on iOS requirement (16.4 vs 26.0). 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.

DoD Systems Engineering ships an update every 5 months, ESF#3 Field Guide every 2 weeks. The most recent releases landed on November 1, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | DoD Systems Engineering | ESF#3 Field Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (4 ratings)](https://appshunter.io/ios/app/dod-systems-engineering/id505317207/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 10 MB | 98 MB |
| Requires iOS | 26.0 | **16.4** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Russell Shannon](https://appshunter.io/developer/505317310) | [Donald Schlack](https://appshunter.io/developer/1403171629) |

## What reviewers say

### DoD Systems Engineering

[App page](https://appshunter.io/ios/app/dod-systems-engineering/id505317207)

This app serves as a pocket reference for the Department of Defense Systems Engineering Technical Review process. It offers definitions for nearly 250 acronyms, details on Technology Readiness Levels, and in-depth information on review phases and technical processes.

**Highlights:** Acronym lookup (250+ definitions), Technology Readiness Level definitions, Review information by phase, Phase details (Materiel Solutions Analysis to Operations & Support), Technical and technical management processes

**Features:** Vision Pro support

**In-app purchases:** none


### ESF#3 Field Guide

[App page](https://appshunter.io/ios/app/esf3-field-guide/id1632993581)

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

**In-app purchases:** none


## Frequently asked questions

### Is DoD Systems Engineering free?

DoD Systems Engineering is free to download, with no in-app purchases.

### Is ESF#3 Field Guide free?

ESF#3 Field Guide is free to download, with no in-app purchases.

### Do DoD Systems Engineering or ESF#3 Field Guide have ads?

Neither DoD Systems Engineering nor ESF#3 Field Guide shows ads.

### Which is updated more often, DoD Systems Engineering or ESF#3 Field Guide?

DoD Systems Engineering ships an update every 5 months, and ESF#3 Field Guide every 2 weeks. Most recently, DoD Systems Engineering was updated on November 1, 2026 and ESF#3 Field Guide on October 27, 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.*