Blindspot is an AI-powered English writing checker built around a specific observation: learners often know the rules yet repeat the same mistakes. Hosted at blindspot.study, the platform invites users to paste a short English text, such as an email, a message, or a work note, and returns corrections paired with explanations. Rather than acting as a passive proofreading tool, Blindspot gathers the errors a learner repeatedly makes and converts them into personalized practice across grammar, vocabulary, and writing.
The product serves individual English learners, including students and professionals who write in English regularly, and targets a consumer audience rather than enterprises. Its public interface appears in both English and Russian, with a dedicated Russian-language version and inline Russian translations for suggested vocabulary. The service is free to start with no card required, and an optional paid tier unlocks additional practice. The brand operates as a small, product-focused team and positions itself as an early-stage language learning tool.
Services & Expertise
Blindspot combines automated text correction with study tools that reinforce the rules behind each change. The website presents the following capabilities.
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AI Writing Check: The central tool accepts a block of English text and returns a corrected version. A demonstration on the landing page shows the phrase "didn't saw" being replaced with "didn't see", with the correction displayed inline so the learner sees exactly what changed.
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Rule Explanations: Each correction is accompanied by a short rationale. In the example, Blindspot explains that "didn't" already marks the past tense, so the verb that follows must remain in its base form. This explanation layer distinguishes the product from grammar checkers that flag errors without teaching the underlying rule.
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Personalized Grammar Practice: When the same error appears across several texts, Blindspot groups the instances under a shared grammar topic. Three sample sentences, "didn't saw", "didn't went", and "didn't understood", are aggregated under "Past Simple: negative sentences", followed by a multiple-choice question that asks the learner to select the correct verb form.
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Vocabulary Saving: Suggestions drawn from the learner's own writing can be added to a personal dictionary. Each entry includes the word, a plain-language meaning, part-of-speech labels for noun and verb forms, a contextual example sentence, collocations such as "make every endeavour" and "creative endeavour", and synonyms grouped by part of speech.
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Flashcard Review: Saved vocabulary feeds a flashcard routine, allowing words to be reviewed and retained over time. The site frames this as a next step after adding a word to the dictionary.
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Free English Level Test: A standalone level test offers learners a way to establish a starting point before beginning structured practice, and is linked directly from the homepage as guidance for those unsure where to begin.
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Chrome Extension: A browser extension brings two functions into everyday browsing. Selecting a word on any page and clicking an add button saves it to the vocabulary list, while a separate check mode returns corrected text and grammar notes in an on-page popup.
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Bilingual Support: Russian translations are shown alongside English suggestions, for instance mapping "готовился" to "was preparing" or "was studying". A Russian-language version of the site mirrors the English experience.
How They Work
The journey begins on the homepage, where a hero form accepts between 30 and 300 characters. A learner pastes a passage, such as an email in progress or a few sentences about the day, and clicks the check button. Visitors who are not signed in see a window that lets them continue with Google, after which they confirm their native language. The text is then analysed and the result opens in the account, with the draft held in the browser tab until submission. Inside the app, the same checker accepts texts of up to 5,000 characters.
The output is structured in layers. The first layer shows a corrected version of the text with changes marked. The second explains why each change was made, tying the fix to a rule. The third collects recurring problems into grammar topics and offers a short practice question. A fourth optional step surfaces vocabulary from the text that the learner may wish to save, and saving remains a manual choice so the personal dictionary stays curated. Submitted text is sent to OpenAI for analysis, and both the text and the result are stored in the learner's account, a detail disclosed in the FAQ and privacy documentation.
Ideal Client Profile
Several learner profiles map naturally onto the product.
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Adult professionals writing workplace English: Someone who drafts emails, meeting notes, or messages each day and wants corrections that explain workplace grammar conventions rather than merely rewriting the sentence.
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Intermediate learners with persistent errors: A learner who already knows the rules but keeps producing the same construction, such as a past-tense negative, needs the pattern aggregated across texts and turned into targeted drills.
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Students preparing for exams: Learners revising for language assessments benefit from the level test, structured grammar topics, and a vocabulary list built from their own writing rather than a generic word bank.
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Russian-speaking English learners: Because the interface and translations support Russian, learners whose first language is Russian can see native-language glosses beside English suggestions, reducing friction when encountering unfamiliar words.
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Self-directed vocabulary builders: Anyone who reads English during the day and wants to capture words on the spot can use the Chrome extension to save terms while browsing, then review them as flashcards later.
Pricing & Engagement Models
Blindspot follows a freemium structure. Creating an account allows learners to try text checks and personalized practice at no cost, and no card is required to begin. The site states plainly that payment for additional practice is optional and can be chosen later, which implies a subscription or usage-based upgrade rather than a single one-off purchase. The public demo form on the homepage is limited to 30 to 300 characters, while the in-account checker extends to 5,000 characters, so the broader allowance is tied to registration. Specific price points are not published on the landing page, and prospective users would need to sign in to view current plan details.
Why Consider Them
Blindspot differentiates itself through explanation rather than correction alone. Many grammar tools return a clean sentence, but this product ties each change to the rule behind it and aggregates repeated errors into focused drills, treating the learner's own mistakes as the syllabus. The vocabulary workflow keeps the learner in control, since suggested words are added only by explicit choice, and entries include collocations, synonyms, and part-of-speech detail rather than a bare definition. The Chrome extension extends checking and word capture into ordinary browsing, lowering the effort of building a personal dictionary. Bilingual English and Russian support broadens accessibility, and the free starting point removes the initial cost barrier. The trade-offs are those of an early-stage product: a narrow language focus, unpublished pricing, and reliance on a third-party AI provider to process submitted text.
