Learn English through writing
Write in English. Stop repeating the same mistakes.
Emails, chat messages, notes. Blindspot explains every mistake, notices the ones you keep making, and turns them into short practice.
- Free to start
- An explanation for every mistake
- Practice built from your mistakes
Not sure where to start? Take the free English level test
Your blind spot
One mistake is a slip. Three is your pattern.
A regular checker fixes the text and forgets. Blindspot remembers every mistake and notices when you make it again — in different texts, weeks apart.
Email to a colleague · Week 1
Sorry, I
didn’t sawdidn’t see your message yesterday.Chat message · Week 2
She
didn’t wentdidn’t go to the meeting.Diary entry · Week 3
We
didn’t camedidn’t come back early.
Pattern found · 3 times in 3 weeks
Base form after “didn’t”
After didn’t / doesn’t / don’t, use the base form of the verb: see, go, come — not saw, went, came.
Practice made for you
She didn’t ___ the email yesterday.
You practise the rule until the mistake stops showing up in your writing.
How it works
Write as you normally do
An email to a colleague, a chat message, a few lines about your day. Your words, your level.
See what’s wrong and why
Every correction comes with a short explanation of the rule. Save the new words to your personal dictionary.
Train your weak spots
Blindspot collects the mistakes you repeat and turns them into short exercises — only what you actually need.
Sound familiar?
Some of the most common mistakes non-native speakers make in work emails and messages. Blindspot catches them in your texts and shows which ones you keep repeating.
Articles
✗ I have meeting with client at noon.
✓ I have a meeting with the client at noon.
Prepositions
✗ It depends from the budget.
✓ It depends on the budget.
Present Perfect
✗ Did you see the new policy yet?
✓ Have you seen the new policy yet?
Future after “when”
✗ When I will finish, I will send it.
✓ When I finish, I will send it.
Extra preposition
✗ Let’s discuss about it tomorrow.
✓ Let’s discuss it tomorrow.
Polite tone
✗ Send me the report.
✓ Could you send me the report, please?
Why corrections alone don’t stick
Automatic checkers
They fix the text, you click “accept” — and tomorrow you make the same mistake.
Rewriting with AI
The text gets smooth, but it stops sounding like you, and your skills don’t grow.
Lessons with a tutor
They help, but they’re expensive and don’t always fit your schedule.
Blindspot
Keeps your text yours, explains every correction, and remembers which mistakes you repeat.
Inside the app
Writing, vocabulary and grammar in one place
Your text
Yesterday I didn't saw my friend at the university. I was waiting for him near the library, but he only came in the evening. He said he was busy because he готовился for the exam all day.
Free example · Your account stays unchanged
Feedback
Correction
didn't sawdidn't see
Why it changes
Didn’t already marks the past tense. The following verb stays in its base form, see.
A word you could save
готовилсяwas preparing / was studying
You choose whether to save a suggested word to your vocabulary.
Save words and check writing as you browse
Select a word and click + to save it to your vocabulary.
More detailsBlindspot
endeavour
стараться, попытка
Questions
Is Blindspot free to start?
Yes. When you sign up, you get free text checks and practice. No credit card required.
Will it work if my English isn’t great?
Yes, as long as you can write a couple of simple sentences. If you don’t know how to say something, write that part in your own language — Blindspot will show you the English. Not sure about your level? Take the free test.
Will Blindspot rewrite my text?
No. It fixes mistakes, not your style — the text stays yours. Every correction comes with a short explanation of the rule.
What if the AI gets it wrong?
It can happen. That’s why Blindspot doesn’t just swap words — it explains why something is correct, so you can see the logic and decide for yourself.
How is this different from a regular AI chat?
A chat fixes one text and forgets it. Blindspot keeps a history of your mistakes, words, and rules, notices what you repeat, and builds practice from exactly that.
What happens to my text?
The draft is kept in this browser tab. When submitted for checking, the text is sent to OpenAI for analysis, and your text and result are stored in your account. Learn more in our Privacy Policy
Find your blind spots
Write a few lines in English and see which mistakes you keep making without noticing.
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