# RF Link Calc vs DoD Systems Engineering

The clearest difference is price: DoD Systems Engineering at Free against RF Link Calc's $2.99. DoD Systems Engineering also leads on rating (3.8 vs 2.3) and review sentiment (50% vs 20%). RF Link Calc's advantage is device support (3 vs 1) and iOS requirement (9.0 vs 26.0). On ratings volume, ads and in-app purchases there is nothing between them.

DoD Systems Engineering is free to download; RF Link Calc costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DoD Systems Engineering holds the better App Store score, 3.8 against 2.3. Both are backed by a comparable volume of ratings — 3 and 4 respectively. Written reviews point the same way: 20% of RF Link Calc's written reviews are positive against 50% of DoD Systems Engineering's.

RF Link Calc ships an update every 40 months, DoD Systems Engineering every 5 months. The most recent releases landed on August 12, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | RF Link Calc | DoD Systems Engineering |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/rf-link-calc/id303034300/reviews) | **[3.8 (4 ratings)](https://appshunter.io/ios/app/dod-systems-engineering/id505317207/reviews)** |
| Number of ratings | 3 | **4** |
| Positive reviews | 20.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 40 months | **Every 5 months** |
| Monetization | Paid | **Free** |
| Size | 4 MB | 10 MB |
| Requires iOS | **9.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Black Cat Systems](https://appshunter.io/developer/301047032) | [Russell Shannon](https://appshunter.io/developer/505317310) |

## What reviewers say

### RF Link Calc

[App page](https://appshunter.io/ios/app/rf-link-calc/id303034300)

This tool helps radio engineers calculate RF link characteristics, including wireless internet links. It computes maximum distance, required transmitter power, or gain margin by inputting various parameters. It also calculates EIRP, ERP, and field strength in multiple units.

**Highlights:** RF link modeling, Wireless internet link calculations, Maximum distance computation, Transmitter power calculation, Gain margin calculation, EIRP/ERP calculator, Field strength calculator

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is RF Link Calc free?

RF Link Calc costs $2.99, with no in-app purchases.

### Is DoD Systems Engineering free?

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

### Which has better reviews, RF Link Calc or DoD Systems Engineering?

DoD Systems Engineering is rated higher. RF Link Calc averages 2.3 out of 5 from 3 ratings, while DoD Systems Engineering averages 3.8 from 4 ratings.

### Do RF Link Calc or DoD Systems Engineering have ads?

Neither RF Link Calc nor DoD Systems Engineering shows ads.

### Which is updated more often, RF Link Calc or DoD Systems Engineering?

RF Link Calc ships an update every 40 months, and DoD Systems Engineering every 5 months. Most recently, RF Link Calc was updated on August 12, 2026 and DoD Systems Engineering on June 5, 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.*