English writing checker Blindspot uses AI to flag grammar mistakes, explain the rules behind each error and turn weak spots into personalized practice.
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Get ListedBlindspot is an AI English writing checker that reviews original learner text, identifies grammar mistakes, and explains the reasoning behind every correction. Most language tools stop at swapping an error for the right answer, which leaves the underlying rule untouched. Blindspot targets that gap by tracking which mistakes repeat across a learner's writing and turning them into targeted grammar drills and vocabulary cards. The product is built for intermediate English learners, students, and working professionals who recognize the rules in theory but keep slipping in real messages.
AI text checking with rule explanations. The public checker on the landing page accepts between 30 and 300 characters, while the in-app checker handles up to 5,000. Each flagged fragment appears with the original wording struck through, the corrected version beside it, and a short note. A sample correction shows "didn't saw" replaced by "didn't see," followed by the explanation that "didn't" already marks past tense, so the following verb stays in its base form.
Blind spot detection across multiple texts. Instead of treating every mistake as an isolated event, Blindspot collects recurring errors and groups them. The grammar preview displays three separate sentences that share one fault, "didn't saw," "didn't went," and "didn't understood," then labels them under a single shared topic, Past Simple: negative sentences.
Personalized grammar practice. Detected weaknesses become quiz material. The demo question presents a fill-in-the-blank sentence with three radio options and a check answer button, so practice is generated from the learner's own error history rather than a fixed curriculum.
Vocabulary builder with flashcards. Suggested words arrive as structured cards. The example entry for "endeavour" lists the definition, separate noun and verb senses, an example sentence about learning a language, collocations such as "make every endeavour," and synonyms including attempt and strive. Learners decide which words enter the personal dictionary and revisit them as flashcards.
Chrome extension for everyday browsing. The extension saves a selected word with one click and returns a popup with the term, a translation, and a saved confirmation. A second tab checks writing directly on a page, returning corrected text and a grammar note such as the base form rule after "didn't."
Level test, blog, and bilingual interface. A free English level test helps newcomers choose a starting point, while dedicated Grammar, Vocabulary, Writing, and Blog sections provide reference material. The site runs in English and Russian, with hreflang alternates pointing to both versions.
A learner pastes a short piece of English, an email, a message, or a few sentences about the day, into the landing page form, which enforces a 30 to 300 character range. Submitting opens a Google sign-in window, and the draft stays in the browser tab until authentication finishes. After the native language is confirmed, the text is sent to OpenAI for analysis and the result appears with corrections, reasoning, and suggested vocabulary. The learner selects which words to keep, error patterns accumulate into grammar topics, and matching practice questions and flashcards follow. The Chrome extension carries the same checking and saving flow onto any page.
Blindspot suits intermediate and upper intermediate English learners who want error correction tied to explanation rather than silent autocorrect. It fits university students preparing written assignments, professionals drafting emails and work notes in a second language, and self-directed learners who use the free level test as a starting point. Russian speaking learners get a native-language interface, and individual learners, tutors, and small teams can begin on the free tier before deciding whether to pay for additional practice.
