# A単 vs Dunno

The clearest difference is in-app purchases: A単 at none against Dunno's 10. A単 also leads on ads (none vs shown). Dunno's advantage is update cadence (fortnightly vs every 12 months). On price, device support 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. A単 asks for nothing beyond the download.

A単 ships an update every 12 months, Dunno fortnightly. The most recent releases landed on October 25, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | A単 | Dunno |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (30 ratings)](https://appshunter.io/ios/app/dunno-english-dictionary/id1564720498/reviews)** |
| Number of ratings | — | **30** |
| Positive reviews | — | 90.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 12 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 18 MB | 196 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jazz Soft, Inc.](https://appshunter.io/developer/1439040352) | [Linh Nguyen](https://appshunter.io/developer/1435435840) |

## What reviewers say

### A単

[App page](https://appshunter.io/ios/app/a/id1493717408)

**Features:** macOS Compatibility

**In-app purchases:** none


### Dunno

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

This app serves as an intelligent English learning assistant, offering comprehensive dictionary functions, translation capabilities, and tools to improve vocabulary and grammar. It features offline access, voice and image lookup, pronunciation guides, and error checking to enhance English proficiency.

**Highlights:** Offline English dictionary, English to 89 languages translation, Grammar lookup by levels, Voice and image word lookup, Audio pronunciations (British/American), Grammar error checking, Vocabulary notebook with flashcards and quizzes

**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 |


## Frequently asked questions

### Is A単 free?

A単 is free to download, with no in-app purchases.

### Is Dunno free?

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

### Do A単 or Dunno have ads?

Dunno shows ads; A単 does not.

### Which is updated more often, A単 or Dunno?

A単 ships an update every 12 months, and Dunno fortnightly. Most recently, A単 was updated on October 25, 2026 and Dunno on October 27, 2026.

---

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