# Duo ABC vs K

The clearest difference is ads: Duo ABC at none against K's shown. K's advantage is ratings volume (142 vs 21). On price, rating, update cadence and in-app purchases there is nothing between them.

Both are free to download. Duo ABC sells 8 in-app purchases, starting at $1.49 per 3 months and K sells 8 in-app purchases, starting at $1.99 per 3 months. Whichever you choose, the download price is not the number that matters.

Duo ABC holds the better App Store score, 4.6 against 4.4. That said, the two scores are not equally well evidenced: K has 142 ratings behind it against 21, so its average is the more settled of the two.

Duo ABC ships an update every 3 weeks, K every 2 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Duo ABC | K |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (21 ratings)](https://appshunter.io/ios/app/duo-abc/id1594001123/reviews)** | [4.4 (142 ratings)](https://appshunter.io/ios/app/k-12-math-learning-and-practice/id6446872948/reviews) |
| Number of ratings | 21 | **142** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 158 MB | 202 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [nguyen thanh](https://appshunter.io/developer/1481436893) | [DEVWORLD VIETAM COMPANY LIMITED](https://appshunter.io/developer/1867412933) |

## What reviewers say

### Duo ABC

[App page](https://appshunter.io/ios/app/duo-abc/id1594001123)

This app helps 10th-grade students master English with interactive tests and lessons. It offers offline access and allows for self-paced learning, making it a convenient tool for academic success.

**Highlights:** Offline Access, Interactive Tests, Self-paced Learning, Teacher-Friendly Interface, Grade 10 English Mastery

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Three Months VIP | $1.49 | per 3 months |
| Learning Premium Monthly Plan | $1.99 | per month |
| One Month VIP | $4.99 | per month |
| Learning Premium HalfYear Plan | $5.99 | per 6 months |
| Learning Premium Annual Plan | $9.99 | per year |
| 1 Year VIP | $24.99 | per year |
| Six Months VIP | $24.99 | per 6 months |
| No ads Pack | $14.99 | one-time |


### K

[App page](https://appshunter.io/ios/app/k-12-math-learning-and-practice/id6446872948)

Master K-12 math with interactive games and practice covering algebra, calculus, and more. Features AI-powered explanations, quizzes, and a graphing calculator for on-the-go learning.

**Highlights:** Comprehensive math topics, AI-powered solver with explanations, Interactive quizzes, Smart graphing calculator, Video lessons and tips, Offline practice

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Three Months VIP | $1.99 | per 3 months |
| Learning Premium Monthly Plan | $1.99 | per month |
| One Month VIP | $4.99 | per month |
| Learning Premium HalfYear Plan | $5.99 | per 6 months |
| Learning Premium Annual Plan | $9.99 | per year |
| Six Months VIP | $24.99 | per 6 months |
| 1 Year VIP | $49.99 | per year |
| No ads Pack | $14.99 | one-time |


## Frequently asked questions

### Is Duo ABC free?

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

### Is K free?

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

### Which has better reviews, Duo ABC or K?

Duo ABC is rated higher. Duo ABC averages 4.6 out of 5 from 21 ratings, while K averages 4.4 from 142 ratings.

### Do Duo ABC or K have ads?

K shows ads; Duo ABC does not.

### Which is updated more often, Duo ABC or K?

Duo ABC ships an update every 3 weeks, and K every 2 weeks. Most recently, Duo ABC was updated on October 25, 2026 and K on October 24, 2026.

---

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