NativeLingo

NativeLingo works the opposite way to most language apps. You don't open it to study. You install the Chrome extension, pick a language and keep reading the sites you normally read. On each page it swaps a handful of words into the language you're learning, chosen for your level, and you can hover any of them to see the original and how it's pronounced. A level test takes about three minutes; skip it and you start at B1.

The detail that sets it apart is grammar. Many word-swap tools drop in the dictionary form, so you get sentences like I bought two libro. NativeLingo matches plurals and verb tenses to the sentence, and when it isn't sure of the right form it shows the plain word instead of guessing. The site lists Spanish, French, German, Italian, Portuguese, Dutch, Swedish and English as learning languages.

The words you meet go into a review that asks you to type each one back, not just tap a button saying you knew it. Reviews are spaced out, so a word you get right comes back in a few days. That review, along with your word list, streaks, awards and goal tracking, is part of Pro, which the pricing table lists at $6.99 a month billed $83.88 a year, with weekly and monthly options too. The free plan keeps word swaps on every site, swaps in YouTube and Netflix subtitles, one language, a news feed with three articles a day, and one book of your own plus a shelf of free classics.

A browser extension that rewrites every page you read raises an obvious question, and the privacy policy answers it in detail. The extension analyzes pages inside your browser, and translations come from a dictionary downloaded to your browser, not from an AI model or translation service. It skips email, banking and sign-in pages, and you can pause it on any site. What it sends to the server is the word you were shown, its form, its translation and the time, plus a broad site category like News or Recipes for awards. Page text, titles and addresses aren't sent. Sign-in is through Google, payments go through Lemon Squeezy, and the website uses Google Analytics and Google Ads measurement. Account deletion is in Settings, with a seven-day window before it's final. The policy names the operator only as NativeLingo, with a support email.

It fits intermediate learners who read a lot online and want steady vocabulary exposure without setting aside study time. Complete beginners or anyone who needs speaking practice will want something else alongside it.