José Luis Arias
Development and machine learning
Physics graduate specialising in machine learning. He builds the apps and makes sure they run smoothly on iPhone, iPad, Mac and Apple Watch.
- Degree in Physics
- Specialised in machine learning
In short
The Natural Apps team: José Luis Arias (development and machine learning; physics graduate), Victoria Rodríguez (marketing and App Store; business graduate and computer engineer) and Sara Arias (English adviser, ideas and testing).
They make four apps, Tides Pro, MD Reader, Natural English and Precio Luz, published on the App Store under the name Victoria Rodriguez Diaz, plus the tides website tablamareas.es (in Spanish). Contact: natural.learning.apps@gmail.com.
The team
The same team is behind every app. If you write to support, someone from the team answers.
Victoria Rodríguez
Marketing and App Store
Business graduate and computer engineer. She gets the word out and looks after how the apps are presented on the App Store, where they are published under her name.
- Degree in Business Administration
- Computer engineer
Sara Arias
English adviser, ideas and testing
English adviser for Natural English. She comes up with ideas for new features and tests every version before it reaches the App Store.
What we do
We cover the whole journey of an app as a team: from design and code to its App Store page, the website that goes with it and measuring how it all works.
- Native Apple appsDesign and development of apps for iPhone, iPhone Duo, iPad, Mac and Apple Watch with SwiftUI, widgets and Live Activities.
- Machine learningTraining and hands-on experience in the team for working with models and data inside the apps.
- DistributionWe build with Xcode Cloud, test every version with TestFlight and ship it through App Store Connect.
- ASOApp Store optimisation: keywords, screenshots and copy in several languages, Custom Product Pages and Product Page Optimization (A/B tests of the App Store page).
- SEO, GEO and AEOOur websites, built for search engines (SEO), for AI assistants (GEO) and for direct answers and featured snippets (AEO).
- Analytics and our own websitesGoogle Analytics 4 and Search Console, with prior consent and in line with the GDPR; and our own websites, such as tablamareas.es.
Our apps at a glance
App Store data as of 26 October 2026. In-app purchase prices are those shown in the App Store in each country.
| App | App Store name | Devices | Price | App languages | Link |
|---|---|---|---|---|---|
| Tides Pro | “Tides Pro: Weather & Coast” (Spain: “Mareas Pro: Clima y Costa”; France: “Tides Pro : Marées et Météo”; Portugal: “Marés Pro: Clima e Costa”) | iPhone, iPhone Duo and Apple Watch (iOS 26.2 or later) | Free and ad-free; Premium subscription, yearly, quarterly or monthly (1-week trial on yearly) | English, Spanish, French and Portuguese | View on the App Store |
| MD Reader | “Markdown Reader & Editor: MD” (Spain: “Markdown: Lector y Editor MD”) | iPhone, iPhone Duo, iPad (iOS 18 or later) and Mac | Reading is free; Pro is a one-time purchase, no subscription, 7-day trial | 14 languages, including English and Spanish | View on the App Store |
| Natural English | “English Vocabulary B1-B2-C1-C2” (Spain: “Vocabulario Inglés B1-B2-C1-C2”) | iPhone, iPhone Duo and iPad (iOS 26 or later) | Free to start (500 words, no account); paid Premium unlocks all 10,000 | Content in English; interface in 9 languages | View on the App Store |
| Precio Luz | “Precio Luz España PVPC” (Spanish App Store only) | iPhone and iPhone Duo (iOS 26 or later) | Free, no ads, no sign-up | Spanish | View on the App Store |
For Tides Pro, how we compute the tides and how we check them against official predictions is explained in the tablamareas.es methodology (in Spanish).
Contact
Email us at natural.learning.apps@gmail.com. Each app also has its own support page, linked from its card on the home page.