RAIO App
by Kale Anders
- Education
- Free
- Small & simple · 93
- Rating
- 2.6
- 15 ratings · Mexico storefront
- Top 66%among 29 Education apps
- Last update
- Feb 19, 2026
- Version 1.16.8
- Size
- 92 MB
- Category
- Education
- Tracked since
- Oct 9, 2026
Estimated revenue
A model estimate with a likely range, not a reported figure.
No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.
How this estimate is made
Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.
Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.
Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.
Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.
Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.
Full methodScreenshots
As shown on the App Store listing.
About this app
Text from the App Store listing.
RAIO is a language learning mobile app that allows language learners to review sentences using the power of spaced repetition technology. With RAIO, learners can effortlessly learn grammar and vocabulary at the same time, without having to study complex grammar rules or do boring grammar drills. The app is designed to help learners stop forgetting and getting stuck in conversations having to translate in their as much as they would when learning with traditional method.
The app’s sentence-based approach is another key feature that sets RAIO apart from traditional language learning methods. Rather than teaching using isolated vocabulary words or abstract grammar rules, RAIO uses real-life sentences that are commonly used in everyday conversations. This approach allows learners to acquire vocabulary and grammar in context, which enhances their understanding of the language and improves their ability to communicate effectively.
Spaced repetition, the underlying technology of RAIO’s language learning app, is a technique used by professional language learners and polyglots to acquire languages faster and with less effort. This method of learning is based on the principle of spacing out the review of previously learned material to optimize long-term retention. By scheduling review sessions based on the user’s progress and difficulty level, RAIO’s spaced repetition technology allows learners to remember words and grammar structures better and for longer periods of time, leading to a faster and more effective language learning experience, regardless of which proficiency level they start with.
Another benefit of using RAIO is that learners can slowly start to think in the language. By reviewing sentences in context and focusing on the meaning rather than the individual words or rules, learners can internalize the language and start to think in it. This improves their ability to communicate effectively and increases their fluency in the language.
In summary, RAIO is an innovative mobile app that revolutionizes language learning with its spaced repetition technology and sentence-based approach. The app’s features, such as its review system, audio recordings, translations in multiple languages, personalized progress reports, and gamification features, enhance the learning experience and provide learners with motivation and a sense of accomplishment. By using RAIO, learners can effortlessly learn grammar and vocabulary, stop forgetting as much, stop getting stuck in conversations having to translate in their head as much, and slowly start to think in the language.
Terms of Use: https://kaleanders.com/raio-app-terms
What’s new
Release notes for the latest version, as written by the developer.
-Mejoras de rendimiento
-Se ha mejorado la animación que muestra en el nivel actual
-Se ha solucionado el problema de inicio de sesión con Facebook en iOS
Rank history
Daily position in the Ecuador charts. #1 is at the top.
- Best rank
- #6
- Current rank
- #6
- Days charting
- 4 of 7
On the charts today
Small & simple score
How realistic it is for a small team to build something like this.
93/100
Small & simple
- Developer size100% · 25
Developer: 1 app on the charts
- Audience size100% · 20
Ratings: 15
- App size60% · 10
Size: 92 MB
- Price model80% · 15
Price model: free with in-app purchases
- Demand proof100% · 30
Best rank #3, 19 countries
An indicator, not a fact. We can't see team size. Calculated Oct 25, 2026 · method i2
How the score worksVersion history
- 1.16.8LatestReleased Feb 19, 2026