# Trigonometry Portal AR vs Learn Vietnamese

The clearest difference is review sentiment: Learn Vietnamese at 100% against Trigonometry Portal AR's 0%. Learn Vietnamese also leads on price (Free vs $1.99) and rating (4.4 vs 1.0). Trigonometry Portal AR's advantage is ads (none vs shown). On in-app purchases and iOS requirement there is nothing between them.

Learn Vietnamese is free to download; Trigonometry Portal AR costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Learn Vietnamese holds the better App Store score, 4.4 against 1.0. That said, the two scores are not equally well evidenced: Learn Vietnamese has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Trigonometry Portal AR's written reviews are positive against 100% of Learn Vietnamese's.

Trigonometry Portal AR ships an update every 37 months, Learn Vietnamese fortnightly. The most recent releases landed on June 1, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Trigonometry Portal AR | Learn Vietnamese |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/trigonometry-portal-ar/id1358343863/reviews) | **[4.4 (5 ratings)](https://appshunter.io/ios/app/learn-vietnamese-beginner-3/id6450500081/reviews)** |
| Number of ratings | 1 | **5** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 37 months | **Fortnightly** |
| Monetization | Paid | **Ad-supported** |
| Size | 33 MB | 148 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [nguyen thanh](https://appshunter.io/developer/1481436893) |

## What reviewers say

### Trigonometry Portal AR

[App page](https://appshunter.io/ios/app/trigonometry-portal-ar/id1358343863)

Explore trigonometry concepts in an augmented reality environment. This app creates virtual rooms where you can interact with information about key terms and ideas from the high school curriculum. Walk around, tap on objects, and hear definitions read aloud.

**Highlights:** Augmented reality exploration, Virtual trigonometry rooms, Interactive information access, Siri-read aloud definitions, Scrollable term lists

**Features:** macOS Compatibility

**In-app purchases:** none


### Learn Vietnamese

[App page](https://appshunter.io/ios/app/learn-vietnamese-beginner-3/id6450500081)

This educational app helps third graders learn Vietnamese through reading, writing, listening, and speaking. It uses stories, poems, and vivid pictures to introduce characters and useful lessons. The app also includes games, progress tracking, and exams.

**Highlights:** Read, write, listen, and speak Vietnamese, Stories, poems, and essays, Entertaining games, Learning history and progress tracking, Term exams and practice exercises, Vivid pictures and friendly characters

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Trigonometry Portal AR free?

Trigonometry Portal AR costs $1.99, with no in-app purchases.

### Is Learn Vietnamese free?

Learn Vietnamese is free to download, with no in-app purchases.

### Which has better reviews, Trigonometry Portal AR or Learn Vietnamese?

Learn Vietnamese is rated higher. Trigonometry Portal AR averages 1.0 out of 5 from 1 ratings, while Learn Vietnamese averages 4.4 from 5 ratings.

### Do Trigonometry Portal AR or Learn Vietnamese have ads?

Learn Vietnamese shows ads; Trigonometry Portal AR does not.

### Which is updated more often, Trigonometry Portal AR or Learn Vietnamese?

Trigonometry Portal AR ships an update every 37 months, and Learn Vietnamese fortnightly. Most recently, Trigonometry Portal AR was updated on June 1, 2026 and Learn Vietnamese on October 24, 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.*