# Duo ABC vs Codos Pro

The clearest difference is price: Duo ABC at Free against Codos Pro's $1.99. Duo ABC also leads on update cadence (every 3 weeks vs every 40 months). Codos Pro's advantage is in-app purchases (none vs 8) and iOS requirement (13.0 vs 15.0). On ads and device support there is nothing between them.

Duo ABC is free to download; Codos Pro costs $1.99 up front. Duo ABC sells 8 in-app purchases, starting at $1.49 per 3 months. Codos Pro asks for nothing beyond the download.

Duo ABC ships an update every 3 weeks, Codos Pro every 40 months. The most recent releases landed on September 1, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Duo ABC | Codos Pro |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.6 (20 ratings)](https://appshunter.io/ios/app/duo-abc/id1594001123/reviews)** | — |
| Number of ratings | **20** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 40 months |
| Monetization | Free with in-app purchases | — |
| Size | 262 MB | 194 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [nguyen thanh](https://appshunter.io/developer/1481436893) | [Lukasz Rodewald](https://appshunter.io/developer/1439781277) |

## 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 |


### Codos Pro

[App page](https://appshunter.io/ios/app/codos-pro/id6443895782)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Duo ABC free?

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

### Is Codos Pro free?

Codos Pro costs $1.99, with no in-app purchases.

### Do Duo ABC or Codos Pro have ads?

Neither Duo ABC nor Codos Pro shows ads.

### Which is updated more often, Duo ABC or Codos Pro?

Duo ABC ships an update every 3 weeks, and Codos Pro every 40 months. Most recently, Duo ABC was updated on September 1, 2026 and Codos Pro on September 22, 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.*