NeonLingo

Looking a word up is easy. Remembering it a week later is the hard part. NeonLingo's answer is to bring words back through what you already read. Select an unknown word on a Spanish news site, say, and the translation appears on the page. The word goes into your wordbook without an extra step, and the next time it turns up on another page, NeonLingo highlights it. The repetition happens while you're reading something you chose.

Signing in adds FSRS spaced-repetition flashcards that sync between devices, if you want a more deliberate review as well.

The second mode suits learners earlier on. On pages in your native language, NeonLingo swaps selected words into the language you're learning and leaves the rest of the sentence alone, so you work out the new word from context. The site ties this to Stephen Krashen's idea of comprehensible input and says it picks words one step above your level. The public pages don't show how well that level targeting works, but the mechanism is easy to follow.

The free plan includes automatic highlighting, a 200-word wordbook, 200 interpretations a month and word translation in documents. Premium raises the wordbook to 500 words and adds DeepL and AI translation with phonetic transcription, and Premium+ lifts the interpretation limits further. The pricing page lists both paid tiers with monthly and yearly options.

The privacy policy, updated October 27, 2026, names Taaakooo Tech LLC as the operator. It says selected text and nearby context go to translation providers such as OpenAI, with Cloudflare AI Gateway, Qwen or DeepSeek used when configured, and that account data is stored in the United States. The extension needs permission to read and change page content for its features. One detail worth knowing before you sign up: the policy says new accounts with a verified email are subscribed to its emails by default.