# RAIO App vs Opción Sigma Educación

The clearest difference is review sentiment: Opción Sigma Educación at 100% against RAIO App's 20%. Opción Sigma Educación also leads on rating (5.0 vs 2.7) and in-app purchases (none vs 2). RAIO App's advantage is ratings volume (43 vs 13). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. RAIO App sells 2 in-app purchases, starting at $19.99 per month. Opción Sigma Educación asks for nothing beyond the download.

Opción Sigma Educación holds the better App Store score, 5.0 against 2.7. Both are backed by a comparable volume of ratings — 43 and 13 respectively. Written reviews point the same way: 20% of RAIO App's written reviews are positive against 100% of Opción Sigma Educación's.

RAIO App ships an update every 6 weeks, Opción Sigma Educación fortnightly. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | RAIO App | Opción Sigma Educación |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (43 ratings)](https://appshunter.io/ios/app/raio-app/id6446694876/reviews) | **[5.0 (13 ratings)](https://appshunter.io/ios/app/opcion-sigma-educacion/id6463662845/reviews)** |
| Number of ratings | **43** | 13 |
| Positive reviews | 20.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 88 MB | 49 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kale Anders](https://appshunter.io/developer/1678765749) | [Sigma Option LLC](https://appshunter.io/developer/1704734593) |

## What reviewers say

### RAIO App

[App page](https://appshunter.io/ios/app/raio-app/id6446694876)

This app uses spaced repetition technology and real-life sentences to help you learn grammar and vocabulary in context. It aims to improve retention, reduce translation in your head, and help you start thinking in the language you're learning.

**Highlights:** Spaced repetition technology, Sentence-based learning, Learn grammar and vocabulary in context, Reduce translation in your head, Think in the target language, Personalized progress reports, Gamification features

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly - Standard Plan | $19.99 | per month |
| Annual - SAVE 20%! | $179.99 | per year |


### Opción Sigma Educación

[App page](https://appshunter.io/ios/app/opcion-sigma-educacion/id6463662845)

Learn about financial options and their associated risks through accessible courses, classes, and videos. This platform offers a user-friendly experience with features like push notifications and saved content.

**Highlights:** Access courses, classes, and videos, Push notifications for updates, Password-free access to classes, Save favorite content, User-friendly interface

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is RAIO App free?

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

### Is Opción Sigma Educación free?

Opción Sigma Educación is free to download, with no in-app purchases.

### Which has better reviews, RAIO App or Opción Sigma Educación?

Opción Sigma Educación is rated higher. RAIO App averages 2.7 out of 5 from 43 ratings, while Opción Sigma Educación averages 5.0 from 13 ratings.

### Do RAIO App or Opción Sigma Educación have ads?

Neither RAIO App nor Opción Sigma Educación shows ads.

### Which is updated more often, RAIO App or Opción Sigma Educación?

RAIO App ships an update every 6 weeks, and Opción Sigma Educación fortnightly. Most recently, RAIO App was updated on October 24, 2026 and Opción Sigma Educación on October 9, 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.*