Writing controls for document drafting
Supports writing styles, tones, creative settings, and response length controls in the Word Basic edition.
Ghostwriter
ClaimGhostwriter Microsoft Office add-ins for Word, Outlook, Excel and PowerPoint. AI-assisted writing and analysis with your own API key for OpenAI, Google Gemini and xAI Grok.
Overview
Ghostwriter is a family of Microsoft Office add-ins focused on AI-assisted writing and content work inside Word, Outlook, Excel, and PowerPoint. The site presents separate editions for different apps and roles, including Word Basic, Word PRO, Word Ultimate, Outlook, Excel, PowerPoint, Author, Legal, and a bundle license that covers all four Office add-ins.
Across the product pages, Ghostwriter is positioned as a single-user, one-time-purchase add-in that installs from the Office Store and works with Office 2021, Microsoft 365, and Office Online on Windows, Mac, Web, and iPad. Buyers are told they can add their own API key to unlock models from OpenAI, Google Gemini, and xAI Grok, which makes the app a front end for using those models inside Office workflows.
Features
Prompt-driven assistance in Word
Adds quick action prompts and 50 agents/personas in the Word PRO edition, plus language translation and writing-style options.
Expanded editing tools in Word Ultimate
Includes an interactive interface, 100 agents/personas, AI Prompt Writer, inline editing, and the latest reasoning models in the Ultimate edition.
Email drafting support in Outlook
Provides quick action prompts, personas, written tones, and language translation in Outlook, with Azure Cognitive Services available.
Spreadsheet analysis in Excel
Lets users analyze selected table data and generate sample data, with quick action prompts, personas, written tones, and language translation.
Presentation support in PowerPoint
Offers quick action prompts, personas, written tones, writing styles, and language translation for presentation work.
Use cases
Drafting documents in Word
Use Word Basic when you want AI help with drafting, tone, creative settings, and response length while working in Word.
Writing email responses
Use Outlook when you need help creating and responding to large volumes of email with prompts, personas, and tone controls.
Spreadsheet analysis and sample generation
Use Excel when you need to inspect selected tables, analyze data, or generate sample data from a spreadsheet workflow.
Preparing presentation content
Use PowerPoint when you need concise, bulleted facts for presentation slides and want language and tone support.
Role-specific professional writing
Use the Author or Legal editions when your work is tied to writing projects or legal drafting and summarization workflows inside Word.
Pros and Cons
Pros
- Covers several Microsoft Office apps with edition-specific workflows for Word, Outlook, Excel, and PowerPoint.
- Supports multiple platforms listed on the site, including Windows, Mac, Web, and iPad.
- Uses one-time purchase licensing rather than an ongoing subscription on the pages shown.
- Lets buyers use their own API key to access models from OpenAI, Google Gemini, and xAI Grok.
- Offers specialized editions for authors and legal professionals in addition to general Office use.
Cons
- The site does not show a public pricing page and some linked pages return 404, so buyers have to rely on homepage product listings for purchase details.
- Most editions are licensed for a single user, which may limit team deployment unless each user buys a separate key.
- The product depends on the buyer adding an API key to unlock external models, so setup is not fully self-contained.
FAQ
What is Ghostwriter?
Ghostwriter is a set of Microsoft Office add-ins for Word, Outlook, Excel, and PowerPoint. The product pages describe it as an AI writing and analysis assistant that works inside Office and uses the buyer’s own API key to unlock models from OpenAI, Google Gemini, and xAI Grok.
Which Microsoft Office platforms does it support?
The homepage states compatibility with Office 2021, Microsoft 365, and Office Online, and lists Windows, Mac, Web, and iPad support for the add-ins shown there.
How is Ghostwriter licensed and installed?
Installation is listed as coming from the Office Store. The site also says it is a single-user product key and that the product key is usually received about an hour after purchase.
Can I buy Ghostwriter for one app or for the full Office suite?
Yes, but the site presents these as separate add-ins rather than one shared feature set. Word, Outlook, Excel, PowerPoint, and bundle editions are all listed, with the bundle covering all four Office add-ins.
Does Ghostwriter use a subscription model?
The source does not provide a public pricing page beyond the homepage listings. It does show one-time purchase prices on the product pages, but no subscription plan details or free trial information.
Quick Facts
- Category
- Microsoft Office add-ins
- Primary apps
- Word, Outlook, Excel, PowerPoint
- Platforms listed
- Windows, Mac, Web, iPad
- License
- Single-user product key
- Purchase model
- One-time purchase
- Source domain
- ghostwriter-ai.com