Master English Naturally with Comprehensible Input
Stop memorizing grammar. Start understanding. The fastest way to fluency through curated real-world content.
Where would you like to start?
I'm a Beginner
Start from A1 and build a solid foundation with structured learning paths.
View paths →Professional English
150+ specialist vocabulary guides — medicine, law, finance, engineering, and more.
Explore guides →Check My Level
Not sure where you are? Take the interactive CEFR self-assessment.
Find my level →First time here? See how to use the site →
Explore the Library
Curated entry points
These are standalone library paths, separate from the live filters above.
Explore All English Topics
From beginner basics to professional vocabulary — every skill, grammar rule, and specialist field covered.
The Science Behind Input
According to Dr. Stephen Krashen, we acquire language in only one way: when we understand messages. This is called Comprehensible Input (CI).
The i+1 Principle
We provide content that is just one step above your current level, making acquisition effortless.
No Grammar Drills
Your brain naturally builds grammar structures through meaningful exposure, not rote memorization.
Transparency & Sources
We curate educational videos from open sources and always credit the original authors. Our mission is to organize the internet's best learning materials.
Why is it paid?
Costs cover AI analysis, interactive transcripts, and expert curation.
Free Access
Core search and viewing features remain free. We believe in making quality education accessible.
Frequently Asked Questions
What is Comprehensible Input?
It's language input that can be understood by listeners despite them not understanding all the words. It is the core of natural language acquisition.
Where do these videos come from?
These are hand-picked lessons from YouTube. We do not claim ownership and always provide direct attribution to the original creators.
Is this better than Duolingo?
While apps focus on gamified vocabulary, CI Method English focuses on real-world listening fluency—the most critical skill.
Can I use it for free?
Yes! The main library and player are free. We believe in making quality education accessible to everyone.