Find your English blind spots

The mistakes you keep making in English —
Blindspot finds the mistakes you don't notice anymore, explains why they happen, and turns them into practice. Free AI English checker built for ESL writers.

Free. No sign-up needed.

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How Blindspot finds your blind spots

Your text

Yesterday I didn't saw my friend at the university. I was waiting for him near the library but he came only in the evening. He said he was busy because he готовился for the exam all day.

1 error
1 word to learn

Feedback

Base form after "didn't"

Your version

I didn't saw him yesterday

Corrected

I didn't see him yesterday

готовилсяRU

was preparing / was studying

Added to vocabulary
Why English doesn't stick

You can't fix mistakes you don't notice

  • You google a rule, fix one sentence, then make the same mistake next week
  • You "know" articles and prepositions — but still get them wrong every time
  • Generic exercises drill grammar you already use correctly
  • No one tells you which mistakes you actually keep repeating
How Blindspot works

Blind spots become lessons

  • 1
    Write anything — your blind spots get caught automatically
  • 2
    Rules and vocabulary come from your real mistakes, not a textbook
  • 3
    Practice targets the patterns you keep repeating
  • 4
    Everything in one place — your blind spots, your progress, your dictionary
Chrome Extension

Your blind spots show up everywhere

Save words

See an unfamiliar word on any website? Select it, click the + button, and it's instantly translated and added to your vocabulary. No copy-pasting, no switching tabs.

  • Works on any website
  • Auto-translates to your native language
  • Syncs with your Blindspot vocabulary
Add to Chrome — it's free

Preview

endeavour

Blindspot

endeavour

стараться, попытка

Saved!
AI assistants

Practice your English in ChatGPT, Claude — anywhere

Connect Blindspot to your AI

Chat with ChatGPT or Claude as usual — and Blindspot quietly saves every new word you stumble on and every mistake you make. Next time you open Blindspot, your vocabulary and grammar profile already have everything you learned in the chat.

  • ChatGPT, Claude, Cursor — connect in two clicks
  • Words and grammar rules saved as full cards, not flat notes
  • No new chat window — keep using the tools you already love
Connect to ChatGPT

Works with ChatGPT via OAuth. Claude Desktop, Cursor and other MCP clients connect with a personal token.

Preview

ChatGPT · Blindspot connected

I want учить новые слова about путешествия. Yesterday I go to airport but I забыл мой паспорт.

add_word × 3 → topic "Travel"

Saved 3 words to your "Travel" topic in Blindspot:

паспорт— passport
путешествие— trip / journey
забыл— forgot

Also fixed: "I went" instead of "I go" (past simple). Saved as a grammar rule.

What's inside

Most tools polish your English. Blindspot teaches you.

Grammarly fixes one sentence. Blindspot fixes the pattern.

Writing

Write about anything

Pick any topic. Your text gets checked for grammar and vocabulary in one go.

Mix languages freely

Don't know a word? Write it in your language. We'll translate it and add it to your vocabulary.

Vocabulary

Words saved automatically

Unknown words from your text go straight into your personal dictionary. No manual work.

Vocabulary by topic

Generate word packs on any subject — travel, work, exams — and learn what you actually need.

Grammar

Exercises that adapt

Grammar practice adjusts to your level. Get harder tasks as you improve, easier when you struggle.

Think, don't guess

No multiple choice. You analyze sentences, spot errors, and explain why — the way real understanding works.

Find your blind spots

Paste any English text. See what you keep missing.

Free. No sign-up needed.

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blind spot patterns covered

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learners getting unstuck

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free to start