Spellbook Reviews is an AI-powered redlining tool for lawyers that enables them to draft contracts 10x faster. It uses GPT-4 and other large language models to review and suggest terms for contracts in Microsoft Word, detect aggressive terms, suggest important language and clauses that may be missing from the contract, and provide negotiation suggestions. Spellbook has been trained on billions of lines of legal text and can reference facts about the world. It also has an Early Access waitlist with over 83,000 lawyers signed up to try it.