Trinka AI Grammar Checker is a free online proofreading tool focused on academic and technical writing. Core capabilities include grammar, spelling, punctuation, sentence-structure fixes, word-choice and style recommendations, readability improvements, a language quality score, and explanations for corrections to aid learning. It offers browser extension and Microsoft Word add-in integrations, and supports copy-paste editing on the website. Languages supported include English (primary) with Spanish support and US/UK spelling options. On-page checks are limited to 500 words per check/session. A free tier is available for standard checks; for higher monthly usage, advanced features such as plagiarism checks, increased AI-request limits, and enhanced privacy controls are available on paid plans. Related pages cover pricing, API pricing (word-based) with a Confidential Data option, an AI Content Detector, features summary (including plagiarism checks, citation formatting, journal matcher, translation, paraphraser, track-changes Word exports), and a contact page. Privacy options range from standard on the free/basic offering to premium confidentiality options (90-day auto-deletion, Confidential Data Plan, on-premise/private cloud, no AI training) on paid plans.