Grammar Checker Premium

How it actually works

It is a rule-based English checker that runs entirely in the browser, with no AI, no language model and no network request. Grammar, punctuation and usage issues come from a fixed list of hand-written patterns, including regular expressions for common mistakes and rules such as collective nouns taking a singular verb in US English, and spelling comes from scanning words against a small built-in dictionary of frequent misspellings.

It also computes a Flesch reading-ease score from your sentence and syllable counts, giving a rough readability number, and a US or UK selector switches which English conventions the rules assume. Each suggestion appears as a labelled flag you can review and apply.

Your text never leaves the page: the whole analysis is pattern matching on the textarea content, so pasted drafts stay private and nothing is stored or uploaded.

What that means for your results

Because the rules are explicit, every flag is reproducible and comes with a stated reason, so you can see why something was marked rather than trusting a black box. It is honest about its scope - a first-pass helper that catches well-known mistakes, not a proofreader that understands intent.

Where it falls short — honestly

It only supports English, so text in other languages is not actually checked, and the rule and dictionary sets are limited, so many real errors pass unnoticed while a correct but unusual construction may be flagged wrongly. A rules engine cannot see meaning, so it can suggest changes you should refuse, and it cannot judge tone, accuracy or style the way a human editor does.

A real end-to-end workflow

Paste a finished section, review each flag and apply only the fixes you can explain, then re-run after your edits because a correction can introduce a new slip. For counts and readability metrics use Word Counter and Character Counter, and to restructure wording rather than correct it, Article Rewriter is a different, also local, tool.