# One1 vs Dia

The clearest difference is rating: Dia at 5.0 against One1's 3.0. Dia also leads on update cadence (every 9 days vs monthly) and ratings volume (4 vs 1). One1's advantage is in-app purchases (none vs 7). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Dia sells 7 in-app purchases, starting at $6.99 per month. One1 asks for nothing beyond the download.

Dia holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

One1 ships an update monthly, Dia every 9 days. The most recent releases landed on October 15, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | One1 | Dia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/one1/id1669930372/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/dia-learn-languages-with-ai/id6751267816/reviews)** |
| Number of ratings | 1 | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 9 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 66 MB | 29 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [Moustafa Sewedan](https://appshunter.io/developer/1661073019) | [Alu Creative LLC](https://appshunter.io/developer/1693219037) |

## What reviewers say

### One1

[App page](https://appshunter.io/ios/app/one1/id1669930372)

This e-learning app provides students with a digital platform to study and learn directly from their smart devices. It aims to make educational content accessible and convenient for users on the go.

**Highlights:** E-learning platform, Study on smart devices, Accessible educational content, Convenient learning

**In-app purchases:** none


### Dia

[App page](https://appshunter.io/ios/app/dia-learn-languages-with-ai/id6751267816)

Practice speaking a new language with an AI tutor that offers personalized feedback on pronunciation and grammar. Choose from over 40 languages and specific dialects, and customize your AI teacher's personality and voice for a realistic conversation experience.

**Highlights:** 40+ languages and dialects, Customizable AI teacher personality, Real-time grammar and pronunciation feedback, Voice-first conversational practice, Adaptive difficulty levels, Fluency tracking and analytics

**Features:** macOS Compatibility, Apple Watch app, iMessage stickers, Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Premium | $6.99 | per month |
| Weekly Premium | $6.99 | per 7 days |
| Premium Access to TalkToDia | $7.99 | per month |
| TalkToDia 10 Diamond Pack | $4.99 | one-time |
| 30-Day Challenge | $13.99 | one-time |
| 3 Month Fluency Challenge | $13.99 | one-time |
| TalkToDia 90-Day Challenge | $23.00 | one-time |


## Frequently asked questions

### Is One1 free?

One1 is free to download, with no in-app purchases.

### Is Dia free?

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

### Which has better reviews, One1 or Dia?

Dia is rated higher. One1 averages 3.0 out of 5 from 1 ratings, while Dia averages 5.0 from 4 ratings.

### Do One1 or Dia have ads?

Neither One1 nor Dia shows ads.

### Which is updated more often, One1 or Dia?

One1 ships an update monthly, and Dia every 9 days. Most recently, One1 was updated on October 15, 2026 and Dia on October 26, 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.*