Learn Spanish by reading the web.
Contexto quietly swaps a few English words on any page for their Spanish — so you absorb the language in context, as you read.
Try it on this page.
Slide toward Spanish. Watch the paragraph below change under your hand — then hover any underlined word.
Live Spanish density demo
You did not learn your first language from flashcards. You learned it by living inside it, meeting each new word wrapped in a sentence you already understood, and guessing the rest. That quiet inference, repeated a thousand times, is how fluency is built. Contexto brings the same immersion to the pages you already read, a few words at a time, in Spanish, in context.
This is the actual extension behavior — a dial from your reading to gentle immersion.
The idea
How people actually learn a language
Drills teach you about a language.
Classes, flashcards, and quizzes build knowledge of rules. Fluency is acquired differently — by meeting words in context you mostly already understand and inferring the rest. Krashen called this comprehensible input.
You already do this.
You learned your first language this way, and you still guess unfamiliar English words from their surroundings every day. Contexto simply points that same instinct at Spanish.
Immersion, without moving abroad.
You cannot always live in Madrid, but you already read for hours a day. Contexto turns that ordinary reading into gentle, dosed immersion — a few words at a time.
How it works
Four steps, then it fades into your reading
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1
Add Contexto to Chrome.
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2
Read any page as usual.
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3
A few words appear in Spanish, in context — like casa.
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4
Hover to see the original; click to save it — like palabra — and review later.
Everything runs fully offline, on your device. Nothing you read leaves your browser.
Questions
Frequently asked
Is it free?
Yes — free and open source under the MIT license.
Does my reading leave my device?
No. Contexto runs entirely offline; it never sends page text, browsing history, or translations to any server. See the privacy page.
Which languages?
English to Spanish today; the engine is language-agnostic.
How is this different from flashcards?
Flashcards quiz you out of context; Contexto teaches in context, the way immersion does, with no quizzes required (an optional review exists).
Get it
Read the web. Pick up Spanish on the way.
Star the repo to hear when it launches.