# Dunno vs STEM Teller

The clearest difference is in-app purchases: STEM Teller at none against Dunno's 10. Dunno's advantage is device support. On price and iOS requirement there is nothing between them.

Both are free to download. Dunno sells 10 in-app purchases, starting at $6.49 per 3 months. STEM Teller asks for nothing beyond the download.

## The numbers

| Metric | Dunno | STEM Teller |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (31 ratings)](https://appshunter.io/ios/app/dunno-english-dictionary/id1564720498/reviews)** | — |
| Number of ratings | **31** | — |
| Positive reviews | 90.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | — |
| Update frequency | Every 2 weeks | — |
| Monetization | Free with in-app purchases | — |
| Size | 155 MB | 255 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [Linh Nguyen](https://appshunter.io/developer/1435435840) | [DIA-HAEBO CO. LTD](https://appshunter.io/developer/1688514343) |

## What reviewers say

### Dunno

[App page](https://appshunter.io/ios/app/dunno-english-dictionary/id1564720498)

This comprehensive English learning tool offers offline dictionary access, camera and voice translation, pronunciation scoring, and grammar lessons. It includes a vocabulary notebook with flashcards and quizzes, plus practice tests for standardized exams.

**Highlights:** Offline dictionary and grammar, Camera and voice translation, Pronunciation scoring, Vocabulary notebook with flashcards, Grammar lessons by CEFR level, TOEIC mock tests

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic version  -50% | $6.49 | per 3 months |
| Basic version  -40% | $7.49 | per 3 months |
| Standard version  -50% | $8.49 | per year |
| Basic version  -30% | $8.99 | per 3 months |
| Standard version  -40% | $10.49 | per year |
| Standard version  -30% | $11.99 | per year |
| Premium version  -50% | $9.99 | one-time |
| Premium version  -40% | $11.99 | one-time |
| Premium version  -30% | $13.99 | one-time |
| Premium version | $19.99 | one-time |


### STEM Teller

[App page](https://appshunter.io/ios/app/stem-teller/id6449413620)

**In-app purchases:** none


## Frequently asked questions

### Is Dunno free?

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

### Is STEM Teller free?

STEM Teller is free to download, with no in-app purchases.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*