Not a language learning game

AI platform to boost your English

Don’t waste time on apps for beginners
Get AI lessons with your  content
Get startedI have an account

It’s like if ChatGPT and Duolingo had a baby

Leven, Developer of Subtlex
Author's avatar

1. Choose your goal and bring content

It’s easy, just like ChatGPT – copy and paste any content into Subtlex AI and learn English you need in real life
Choose your goal
Everyday ConversationsTech & IT EnglishMovies, Music & GamesBusiness EnglishTOEFL/IELTSTravel EnglishStudy Abroad
Speak naturally in real-life situations
Here’s what you can upload to reach your goal
Casual Conversations
Upload conversations from online forums or articles (e.g., Reddit’s r/conversation, Quora).
TV Shows & Sitcoms
Upload transcripts or subtitles from popular TV shows (e.g., Subscene, OpenSubtitles).
Podcasts & Interviews
Upload transcripts from conversational podcasts (e.g., NPR, The Guardian’s "Podcasts").
YouTube Channels
Upload vlogs or casual YouTube content (e.g., Casey Neistat, The Financial Diet).
Paste any content to get a Duolingo-like lessons

2. Get AI lessons and learn English effectively

Get Duolingo-like lessons, but with your content and the AI-powered features
Choose words and phrases you don't know
Subtlex analyzes your content and finds the most useful words and phrases

AI teaches you based on your level
The most common words learning process
Do exercises
Easy, medium, and hard exercises – complete them all to remember better

Subtlex reminds you when it's time to review words and phrases
Reviewing words with spaced repetition
Read any content like a book
Tap on words to see meanings, translations, pronunciations, and more

AI marks new and learned words in texts
AI-powered reading process

Who am I?

Developer phoneX (Twitter)TikTok
I'm Leven, a former corporate full-stack engineer, team lead, and now a solo developer of Subtlex

I love learning languages, and I was frustrated by all the language learning apps that are mainly aimed at beginners, where it's very difficult to reach any level above B1

They never let you explore vocabulary from a newly released movie like "Oppenheimer" (where you only understood about 10%, but want to improve that). They don't let you read your newly bought book in its original language and limit you to a restricted, copyright-bound catalog. They don't allow you to learn vocabulary from your favorite game, which I wanted to learn and then practice while playing "The Last of Us"

These frustrations led me to create Subtlex :)

I hope you'll enjoy my app, and I'd be happy to get any feedback, suggestions, or questions you might have