# DoD Systems Engineering vs ETS RF Quick Reference

The clearest difference is iOS requirement: ETS RF Quick Reference at 14.0 against DoD Systems Engineering's 26.0. On price, update cadence, ads and in-app purchases 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, ETS RF Quick Reference every 7 months. The most recent releases landed on June 5, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | DoD Systems Engineering | ETS RF Quick Reference |
| --- | --- | --- |
| 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 7 months |
| Monetization | Free | — |
| Size | 10 MB | 10 MB |
| Requires iOS | 26.0 | **14.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Russell Shannon](https://appshunter.io/developer/505317310) | [Emerging Technology Support, LLC](https://appshunter.io/developer/1570653621) |

## 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


### ETS RF Quick Reference

[App page](https://appshunter.io/ios/app/ets-rf-quick-reference/id1570653619)

**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 ETS RF Quick Reference free?

ETS RF Quick Reference is free to download, with no in-app purchases.

### Do DoD Systems Engineering or ETS RF Quick Reference have ads?

Neither DoD Systems Engineering nor ETS RF Quick Reference shows ads.

### Which is updated more often, DoD Systems Engineering or ETS RF Quick Reference?

DoD Systems Engineering ships an update every 5 months, and ETS RF Quick Reference every 7 months. Most recently, DoD Systems Engineering was updated on June 5, 2026 and ETS RF Quick Reference on September 9, 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.*