# Smart Radon vs US Civics Prep Flashcards

The clearest difference is in-app purchases: Smart Radon at none against US Civics Prep Flashcards's 1. Smart Radon also leads on ads (none vs shown) and update cadence (fortnightly vs every 29 months). On price and device support there is nothing between them.

Both are free to download. US Civics Prep Flashcards sells 1 one-off in-app purchase. Smart Radon asks for nothing beyond the download.

Smart Radon ships an update fortnightly, US Civics Prep Flashcards every 29 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Smart Radon | US Civics Prep Flashcards |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (9 ratings)](https://appshunter.io/ios/app/us-civics-prep-flashcards/id1480081832/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 29 months |
| Monetization | — | Free with in-app purchases |
| Size | 38 MB | 36 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Elysian Software](https://appshunter.io/developer/1361575836) | [Junel Corales](https://appshunter.io/developer/694553272) |

## What reviewers say

### Smart Radon

[App page](https://appshunter.io/ios/app/smart-radon/id1361575838)

**Features:** macOS Compatibility

**In-app purchases:** none


### US Civics Prep Flashcards

[App page](https://appshunter.io/ios/app/us-civics-prep-flashcards/id1480081832)

Prepare for the U.S. civics test for citizenship with this study tool. It offers all official questions and answers to help you learn anytime, anywhere. Master the material for your naturalization interview.

**Highlights:** Civics test questions and answers, Study anytime, anywhere, Naturalization interview preparation, Official test material

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


## Frequently asked questions

### Is Smart Radon free?

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

### Is US Civics Prep Flashcards free?

US Civics Prep Flashcards is free to download, with in-app purchases available.

### Do Smart Radon or US Civics Prep Flashcards have ads?

US Civics Prep Flashcards shows ads; Smart Radon does not.

### Which is updated more often, Smart Radon or US Civics Prep Flashcards?

Smart Radon ships an update fortnightly, and US Civics Prep Flashcards every 29 months. Most recently, Smart Radon was updated on November 2, 2026 and US Civics Prep Flashcards on November 3, 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.*