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Free to start on Chrome & Edge · 30 languages · AI-powered
AI language learning,
built into every page you read
NeonLingo is an AI language learning extension for Chrome and Edge. As you read any webpage, select any word you don't know and NeonLingo translates it on the spot, saves it to your wordbook automatically, and shows it again on the next pages you read, so vocabulary sticks without a separate study app. Premium adds AI translation that reads the whole sentence. Free to start, in 30 languages.
4.7★ on the Chrome Web Store · 30 languages · Free to start
neonlingo.com
Hoy hace muy buen tiempo. Quiero pasear por el parque
How NeonLingo works
NeonLingo works on the pages you already read — news, blogs, documentation, and forums.
01
Read what you already read
You browse normally. NeonLingo runs quietly in the background on any webpage.
02
Translate any word, instantly
You select a word you don't know, and NeonLingo shows its translation right on the page, in 30 languages. No copy-paste, no separate tab.
03
Words save themselves, then come back
NeonLingo saves every word you look up to your wordbook automatically, then highlights it wherever it appears next — so you meet it again in real context until it sticks.
Bilingual Reading
Meet new words on the native-language pages you already read
NeonLingo swaps select words on the native-language pages you already read into your target language, choosing words one step above your level (the comprehensible-input idea from linguist Stephen Krashen). New vocabulary sinks in through real reading, not separate study sessions.
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Smart targeting
NeonLingo picks words based on your level, so each swapped word sits one step above what you already know.
Context-based memory
NeonLingo keeps the rest of the sentence in your native language, so you infer each new word from context instead of memorizing a definition.
Frictionless learning
NeonLingo needs no separate vocabulary app — reading the news or any webpage becomes language practice inside the browser you already use.
AI language learning, as you read
NeonLingo turns the foreign-language pages you already read into AI language learning. Select any word to see its translation on the spot; NeonLingo saves it to your wordbook, then highlights it again wherever it reappears. Sign in to use FSRS flashcards across devices. Free to start, in 30 languages.
Reading mode · free · any webpage
Reading mode (free), Translate, auto-save, and re-highlight every word you read
NeonLingo's Reading mode lets you select any word on a foreign-language page and see its translation instantly. NeonLingo saves every word you look up to your wordbook automatically and highlights it again on any page where it reappears, so repeated exposure does the remembering for you. Reading mode is free and works on any webpage in 30 languages.
Instant selection translation
NeonLingo translates any word the moment you select it, right on the page you are reading.
Automatic wordbook
NeonLingo saves every word you look up to your wordbook automatically — up to 200 words free and 500 on Premium.
Review with highlights across the web
NeonLingo highlights every saved word whenever it reappears on any page, so you review through repeated exposure instead of flashcard sessions.
Muchos investigadores creen que el input es una de las claves para aprender un idioma de forma natural
Los estudiantes suelen avanzar cuando reciben input apenas por encima de su nivel actual de
Why it works: exposure isn't enough
Most vocabulary tools stop at the lookup. You translate a word, feel good, and forget it a week later.
NeonLingo is built around retention, not just exposure. Research on vocabulary acquisition is consistent: words stick through spaced repetition — meeting them again at increasing intervals. NeonLingo creates that repetition for you by highlighting your saved words across every site you visit.
No flashcard app to open. No forced study. The web you already read becomes the review.
The only way humans acquire language
is by receivingcomprehensible input
Stephen Krashen
Professor Emeritus at the University of Southern California and renowned language educator
Krashen's i + 1 theory and NeonLingo
Professor Krashen argues that true acquisition happens only when learners receive language input slightly above their current level (i+1).
NeonLingo is designed around exactly this principle.
A dual-engine learning model
Native-language pages
Familiar context in your native language (i) + substituted foreign words (+1) = natural vocabulary growth
Foreign-language pages
Unfamiliar foreign content (i+1) + on-demand translation support = input you can understand (i)
User feedback
Reviews of NeonLingo
Driving a revolution in language learning through technological innovation, helping every user understand and learn foreign languages more easily with our extension.
Developer
As a developer, I read a huge amount of English documentation every day. NeonLingo makes unfamiliar words feel much less intimidating. The selection translation is smooth, and automatic saving removes a lot of manual organization.
AOKO
Test prep student
I'm preparing for IELTS, and the review feature is excellent. Words I've looked up before get highlighted when they appear again on other pages. Seeing them repeatedly in different contexts is far more effective than rote memorization.
Olivia
ADHD learner
As someone with ADHD, repetitive word memorization feels exhausting. NeonLingo surfaces English words in a natural, repeated way, which helps me stay focused and keep learning without feeling drained.
Anonymous user
Fiction reader
I can pick up English vocabulary while reading web novels because the translations stay natural and fit the context. Best of all, the atmosphere of the story stays intact while I am still learning.
Niko, fiction reader
International student
Bilingual Reading feels almost magical. I usually read tech blogs in my native language, and NeonLingo swaps technical terms into English automatically. I end up picking up natural expressions without feeling like I'm studying.
Sarah
Frequently asked questions
Is NeonLingo really free?
Yes. NeonLingo's free plan includes selection translation, a 200-word auto-wordbook, cross-site highlighting, and up to 200 interpretations a month, with no credit card required.
What is NeonLingo?
NeonLingo is an AI language learning Chrome extension that translates the words you select as you browse and saves them automatically. NeonLingo then highlights those words across every site so you review them in real context.
Does NeonLingo work on Chrome and Edge?
Yes. NeonLingo runs on both Google Chrome and Microsoft Edge.
How many languages does NeonLingo support?
NeonLingo supports 30 languages, covering major European and Asian languages.
How is NeonLingo different from Toucan?
Toucan swaps words on the page but doesn't save them. NeonLingo saves every word you look up, highlights it everywhere it reappears, and schedules spaced-repetition review.
Start learning while you
browse, free to start
NeonLingo is a free browser extension for Chrome and Edge that learners use to pick up words from the pages they already read. NeonLingo installs in one click, works on any webpage in 30 languages, and includes a 200-word wordbook on the free plan. New users get 7 days of Premium free.