Factful

Factful is a Chrome extension that checks spelling, grammar and factual accuracy while you write, using live web retrieval, slash commands and personal accuracy analytics. Free for a limited time, with a listed $9.99 plan.

Factful is a writing assistant delivered as a Chrome extension. It combines the usual spelling and grammar checks with a third layer that most proofreaders skip: factuality. As text is drafted in the browser, the tool looks for claims that may be wrong and flags them alongside ordinary language errors, so accuracy and polish are handled in one pass instead of two separate tools. The fact-checking side relies on retrieval augmented generation. According to the homepage, Factful searches the live web, filters what it finds, and keeps the sources it considers most credible, then uses that material to verify details in the user's content. Search engines such as Google, Bing and Yahoo appear in the product's imagery, along with major news outlets as examples of the kind of source it favors. The practical effect is that checks reflect current information rather than only what a language model memorized during training. A second feature is an inline slash command system, billed as an "everything key." Typing a forward slash inside a document opens commands for enhancing or correcting text without leaving the editor. Alongside this, a personalized analytics view tracks corrections over time, shows how accuracy changes, and highlights error patterns that recur across subjects. That makes it useful for people who want to learn from their mistakes rather than only fix them. The audience is anyone who publishes written material where mistakes are costly: bloggers, journalists, students, marketers and researchers. The listed plan includes advanced fact checking, analytics, slash commands, advanced proofreading, model fine-tuning and faster processing. The homepage shows a $9.99 price crossed down to $0 during a limited free period, so the long-term cost is not settled. Among alternatives, Factful sits between grammar-focused assistants and dedicated research or citation tools. Its appeal is combining both inside the browser. The tradeoff is a young product with limited public documentation, a Chrome-only delivery, and no stated detail on how claims are scored or how sources are cited.