# US FLAGS QUIZ vs Trio Math

The clearest difference is in-app purchases: US FLAGS QUIZ at none against Trio Math's 2. Trio Math's advantage is ads (none vs shown) and update cadence (every 4 days vs every 5 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Trio Math sells 2 one-off in-app purchases. US FLAGS QUIZ asks for nothing beyond the download.

US FLAGS QUIZ ships an update every 5 months, Trio Math every 4 days. The most recent releases landed on September 19, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | US FLAGS QUIZ | Trio Math |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 91 MB | 123 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Alon Veig](https://appshunter.io/developer/1660116634) | [CHRISTIAN KNOLL](https://appshunter.io/developer/1796167358) |

## What reviewers say

### US FLAGS QUIZ

[App page](https://appshunter.io/ios/app/us-flags-quiz/id6475587828)

**In-app purchases:** none


### Trio Math

[App page](https://appshunter.io/ios/app/trio-math/id6741913788)

Sharpen your mental math skills by finding number combinations that equal a target number. Each combination must use one multiplication and one addition or subtraction. Compete globally and enjoy a privacy-friendly, ad-free experience.

**Highlights:** Number grid puzzles, Multiplication and addition/subtraction required, Daily Challenge Mode, Global Leaderboard, Jokers for hints, Ad-free and privacy-friendly

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MinusTrio - Espresso | $1.99 | one-time |
| MinusTrio - Cappuccino | $2.99 | one-time |


## Frequently asked questions

### Is US FLAGS QUIZ free?

US FLAGS QUIZ is free to download, with no in-app purchases.

### Is Trio Math free?

Trio Math is free to download, with in-app purchases available.

### Do US FLAGS QUIZ or Trio Math have ads?

US FLAGS QUIZ shows ads; Trio Math does not.

### Which is updated more often, US FLAGS QUIZ or Trio Math?

US FLAGS QUIZ ships an update every 5 months, and Trio Math every 4 days. Most recently, US FLAGS QUIZ was updated on September 19, 2026 and Trio Math on September 14, 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.*