Ghostwriter

Ghostwriter is a privacy-first AI writing assistant that integrates directly into Microsoft Office applications, including Word, Excel, PowerPoint, and Outlook. It enables users to leverage large language models from OpenAI, Google Gemini, and xAI Grok to accelerate content creation tasks such as drafting documents, analyzing data, generating presentation content, and composing emails.

The add-in is available in several editions tailored to different use cases: a Basic edition for students, a PRO and Ultimate edition with advanced features like agents/personas and inline editing, domain-specific editions for authors and legal professionals, and individual add-ins for Excel, PowerPoint, and Outlook. A bundled license provides access to all Office add-ins.

Key features include customizable writing styles and tones, creative control settings, adjustable response lengths, language translation, quick action prompts, and specialized personas that simulate professional roles. The Ultimate edition also offers an AI prompt writer and inline editing capabilities. Users retain full control by bringing their own API keys from supported AI providers, while the add-in itself is available as a one-time purchase without subscription fees.

Ghostwriter emphasizes privacy, ensuring that user data is not exploited, and operates across Windows, Mac, web, and iPad versions of Microsoft Office. With over 2 million installs, it is a mature solution for individuals and professionals seeking to augment their Office workflow with generative AI.