This Outlook add-in runs ChatGPT on your inbox with custom prompts, but there's no free tier -- it's a bespoke build from £4k. We cover real pricing, features, and who …
The ChatGPT Add-in for Outlook, developed by Blueberry Consultants, brings OpenAI's ChatGPT directly into your email workflow. This tool enables businesses to summarize, analyze, and prioritize messages using custom prompts without leaving Outlook. For teams handling high email volumes, this add-in offers a practical way to reduce manual triage time and focus on what matters.
Quick Summary
Overall Rating 4.0/5 Best For Small to mid-size teams using Microsoft 365 who want custom AI email processing Pricing Custom Add-in delivered for a fixed price of £4k – or less; no other plans listed. Free Plan No Ease of Use 4.0/5 Business Value 4.0/5
The ChatGPT Add-in for Outlook addresses a specific operational challenge: the time professionals lose processing high-volume email. Instead of switching between Outlook and a separate AI chat interface, this add-in embeds ChatGPT capabilities directly into the email client. For businesses, this means custom prompts can automatically generate summaries, identify key information, and even flag priority messages. This is one of many AI productivity tools built around email overload. The strategic value lies in reducing cognitive load and standardizing how teams process information, which is particularly relevant for operations-heavy roles in 2026.
Professional reality: This is not a self-serve SaaS product; it requires engaging Blueberry for a custom build or team rollout, which means no instant download or transparent per-seat pricing.
The add-in allows users to define custom prompts that guide ChatGPT to generate relevant summaries or highlights. This flexibility means a legal team can extract different information from an email than a sales team, aligning the AI output with specific departmental needs.
Business outcome: Teams get relevant, role-specific email insights without manual filtering.
Users can choose to analyze the entire email or focus on specific components like the body, subject line, or attachments. This granular control ensures the AI focuses on the most relevant information, reducing noise and improving the accuracy of the output.
Business outcome: More accurate AI analysis by focusing processing power on relevant email sections.
The AI-generated output is displayed in a separate window, allowing users to compare it side-by-side with the original email. This feature supports quick verification and informed decision-making without disrupting the reading flow.
Business outcome: Faster decision-making with easy side-by-side comparison of AI insights and source email.
The tool can identify important information and automatically update the email's importance level, such as marking it as high priority. This helps users manage their attention and ensures critical messages are addressed promptly.
Business outcome: Improved response times to critical emails through automated priority flagging.
Administrators and users can set up multiple configurations, each with its own matching conditions, prompts, and display preferences. This allows different teams or workflows to have tailored AI behavior within the same Outlook environment.
Business outcome: Consistent, standardized AI email processing across different teams and use cases.
Blueberry offers to create a version of the add-in with your custom prompt for your entire 365 domain. This is designed for organizations that want to standardize AI email handling across their workforce with a pre-configured, company-specific prompt.
Business outcome: Company-wide deployment of a standardized AI email tool tailored to your business processes.
The only pricing information shown on this page is for a custom version of the AI Outlook Add-in. According to the site, you provide your LLM prompt and API key, and Blueberry creates a custom version of the Add-in for you. You can then resell the Add-in to unlimited users or use it to improve your business efficiency. Blueberry states it delivers the Add-in for a fixed price of £4k – or less. No other plans, tiers, subscriptions, or free options are listed on this page. For team rollouts, the site directs visitors to contact Blueberry to get started.
| Plan | Price | What You Get |
|---|---|---|
| Custom Add-in for Your Business Best Value | £4k – or less (fixed price) | You provide your LLM prompt and API key; Blueberry creates a custom version of the AI Outlook Add-in that you can resell to unlimited users or use to improve business efficiency. |
Visit the official ChatGPT Add-in for Outlook website to check the latest pricing and plans.
Teams that need the same email-processing value without a custom build often look at MailMaestro instead -- see our guide to the best AI automation and workflow tools for 2026 for a fuller picture of off-the-shelf options.
An executive assistant can use the add-in to generate concise summaries of long, complex email threads, allowing the executive to quickly grasp key points and make faster decisions.
A sales team can configure the add-in to identify and flag emails containing specific keywords related to high-value opportunities, ensuring no hot lead is overlooked.
Support managers can use custom prompts to automatically categorize incoming queries by urgency or topic, helping route tickets to the appropriate team members more efficiently.
An entrepreneur with a specialized prompt can commission a custom version of the add-in from Blueberry for a fixed price and resell it to unlimited users, creating a new revenue stream.
Visit the official ChatGPT Add-in for Outlook website and review the features and custom build options.
Contact Blueberry Consultants through the website to discuss your specific requirements, whether for a team rollout or a custom resellable version.
Provide your LLM prompt and API key to Blueberry, who will then create the custom version of the add-in for you.
Deploy the add-in within your Microsoft 365 environment or begin reselling it to your target users.
For organizations deeply invested in Microsoft 365 that require a highly customized AI email solution, this add-in offers a unique value proposition. Its strength lies in bespoke prompt integration and the ability to standardize AI email processing across a team. However, the lack of transparent pricing and the need for a custom build mean it is not suitable for individuals or businesses seeking an immediate, low-cost solution. It is worth it for teams with specific, well-defined email processing needs that off-the-shelf tools cannot meet.
| Decision Area | ChatGPT Add-in for Outlook | When Another Option Wins |
|---|---|---|
| Best for | Custom AI email processing within Outlook for Microsoft 365 teams | For instant, self-serve AI email assistance with public pricing |
| Pricing | Bespoke, starting at £4k for a custom version | For transparent, per-seat subscription pricing |
| Key feature | Deep integration with custom prompts and configurations | For a broader suite of email features like scheduling and tracking |
| Ease of use | Requires a custom build and setup by the developer | For a simple, install-and-use browser extension or add-in |
| Scaling | Designed for team rollout across a 365 domain | For individual users or small teams needing quick deployment |
While the ChatGPT Add-in for Outlook focuses on processing and analyzing existing emails within the Outlook client, a tool like the ChatGPT AI Email Writer is typically designed to help draft new emails from scratch. The Blueberry add-in's strength is in its custom, in-client processing, whereas other tools may offer a more streamlined experience for generating replies or new messages.
Choose ChatGPT Add-in for Outlook if: You need to analyze and summarize incoming emails with custom prompts directly in Outlook. Choose ChatGPT AI Email Writer if: Your primary need is generating new email content or replies with AI assistance.
Microsoft 365 Copilot offers a native, integrated AI experience across the entire Office suite, including Outlook. While Copilot provides broad AI assistance, the ChatGPT Add-in for Outlook offers a more specialized focus on custom prompt-based email processing. Copilot is a comprehensive platform, whereas this add-in is a targeted tool built by a third-party Microsoft Partner.
Choose ChatGPT Add-in for Outlook if: You want a specialized, custom-built tool focused solely on email analysis with your own prompts. Choose Microsoft 365 Copilot if: You want a comprehensive AI assistant integrated across all Microsoft 365 apps, not just Outlook.
No, there is no free plan. The tool is offered as a custom build, with a fixed price of £4,000 or less for a bespoke version. Team rollouts require a custom quote from Blueberry Consultants.
It is best for organizations using Microsoft 365 that want to run custom ChatGPT prompts on their emails to generate summaries, identify key information, and automatically flag high-priority messages directly within Outlook.
Microsoft 365 Copilot is a comprehensive AI assistant integrated across the entire Office suite. The ChatGPT Add-in for Outlook is a specialized, third-party tool focused specifically on custom prompt-based email processing within Outlook, offering a different level of customization for that single workflow.
It can be if the business has a specific, high-volume email processing need that requires a custom AI solution. However, the bespoke pricing and build process make it less accessible than simpler, self-serve AI email tools that may be more cost-effective for smaller operations.
The main limitations are the lack of transparent, self-serve pricing and the requirement for a custom build. It is not a plug-and-play product, and users must manage their own OpenAI API key and associated costs.
For a wider field of email-productivity picks, see our roundup of business productivity and marketing tools and our guide to the best AI tools for remote workers for 2026.
Bottom Line: Invest in the ChatGPT Add-in for Outlook only if you have a specific, high-volume email processing need that justifies a bespoke, custom-built solution from a Microsoft Partner.
Last Reviewed: August 2026 (fact-checked) | Reviewed by theaitoolsbox.com editorial team
Custom Add-in delivered for a fixed price of £4k – or less; no other plans listed.
ChatGPT Add-in for Outlook is best for Small to mid-size teams using Microsoft 365 who want custom AI email processing.
ChatGPT Add-in for Outlook has an ease-of-use rating of 4.0/5 based on our testing.
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You provide your LLM prompt and API key; Blueberry creates a custom version of the AI Outlook Add-in that you can resell to unlimited users or use to improve business efficiency.
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