Blindspot

What is Blindspot?

Blindspot is an AI powered English writing checker that identifies grammar and vocabulary mistakes, explains the logic behind every correction, and converts recurring errors into personalized practice. The product targets a specific frustration among intermediate and advanced learners: familiar rules that keep breaking in real sentences, the exact pattern the company labels a blind spot. Rather than rewriting a paragraph into cleaner English and stopping there, Blindspot treats each submitted text as diagnostic material. Shared mistakes are clustered into grammar topics, and those topics become drills. The platform suits learners who write emails, messages and work notes in English every day and want feedback that teaches rather than merely polishes, supported by a built in vocabulary system and a bilingual English and Russian interface.

Key Features

• Writing checker with plain language explanations. Every submitted text returns a correction alongside a short note describing why the change is required. A sample on the site shows the phrase "didn't saw" being replaced with "didn't see", with the reasoning that "didn't" already marks past tense, so the following verb must stay in its base form.
• Automatic vocabulary suggestions. The checker surfaces words worth learning from the learner's own text and offers meaning plus translation. In one demo the Russian word "готовился" is mapped to "was preparing" and "was studying", and the learner decides whether to store it in a personal dictionary.
• Rich vocabulary entries. Saved words come with parts of speech, definitions, example sentences, common collocations such as "creative endeavour", and synonym sets split by noun and verb sense, followed by a flashcard prompt for later review.
• Grammar practice generated from real mistakes. When several sentences exhibit the same failure, Blindspot promotes the shared pattern into a grammar topic. The demo groups three flawed negative Past Simple sentences into a single lesson titled Past Simple: negative sentences.
• Chrome extension for daily browsing. A browser extension allows a word to be selected on any page and added to the vocabulary list with one click, or an entire piece of writing to be checked without leaving the current tab.
• Free English level test. A short placement test on the site helps visitors decide where to begin before entering the check flow, and it is positioned as a starting point for newcomers unsure about their current level.

How It Works

The entry point is the landing page checker. A visitor pastes between 30 and 300 characters of English, typically an email draft, a chat message or a few sentences about the day, then presses the check button. If the session is not signed in, a Google sign in window appears, and the draft remains in the browser tab until the account is connected. After signing in and selecting a native language, Blindspot analyzes the text and opens the result view.

From there the workflow splits into three tracks. Corrections arrive with explanations. Suggested words can be added to the personal dictionary. Grammar topics collect the patterns behind the mistakes, and each topic links to practice questions. Registered users work inside the full text checker, which accepts up to 5,000 characters per submission, and move freely between the Grammar, Vocabulary and Writing areas from the main navigation. The Chrome extension extends the same vocabulary list into everyday browsing. The site notes that texts are sent to OpenAI for analysis and that both the text and the result are stored in the account.

Use Cases

• A product manager drafting daily English emails. After running a message through the checker, she receives corrections with brief rule notes and adds two suggested words to the dictionary. Over several weeks, the grammar area reveals which structures keep reappearing, and the drills target those instead of following a generic syllabus.
• A university student writing academic English. A paragraph with mixed tense errors is submitted, and Blindspot clusters three negative Past Simple mistakes into one topic. The student answers generated quiz questions until the base form after "didn't" becomes automatic, converting a repeated slip into a resolved rule.
• A developer reading English documentation all day. The Chrome extension lets him highlight unfamiliar terms such as "endeavour" and save them with definitions, collocations and synonyms. Flashcards generated from the saved list cover the same items later, without interrupting the reading session.

Frequently Asked Questions

Is Blindspot free to start? Yes. An account can be created without a card, and text checks plus personalized practice are available on the free tier. Additional practice can be purchased later.

How much text can be checked at once? The public landing form accepts 30 to 300 characters, while the checker inside an account handles texts up to 5,000 characters.

Is there a Chrome extension? Yes. A Chrome extension saves selected words to the vocabulary list and can check writing while browsing, so the workflow is not confined to the web app.

Which languages does Blindspot support? The interface is available in English and Russian, and suggested vocabulary is translated for Russian speaking learners.

What happens to submitted text? Drafts stay in the browser tab until submission, then the text is sent to OpenAI for analysis and both the text and result are stored in the account, as described in the privacy policy.