The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →There isn’t enough verified information here to name 100 current “best” Microsoft 365 add-ins responsibly. Instead, this guide groups a curated set of products surfaced in Microsoft AppSource by the jobs they may help with. Treat them as leads to check—not ranked winners or endorsements—and confirm each product’s current availability, compatibility, terms, and permissions before adopting it.
What counts as a Microsoft 365 add-in?
An Office add-in works with an Office app such as Word or Excel. AppSource also surfaces a wider connected-app ecosystem, including integrations for Teams. The examples below include both kinds, so a product associated with one host app should not be assumed to work in every Microsoft 365 app or on every device.
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AppSource results can change. A marketplace listing is not, by itself, proof of quality, independent security review, or current availability. Check the live listing and the vendor’s documentation for the exact app, client, platform, and version you use.
Examples by task
Writing and language in Word
- LanguageTool for Microsoft Word: surfaced as a writing and language example.
- Grammarly for Microsoft Word: surfaced in the same category.
- DeepL for Word: another Word-related language tool surfaced in AppSource.
These examples are not a comparison of features or a claim that one is better. Verify the current Word clients and platforms each supports, along with the vendor’s terms and permissions.
Research and citations in Word Online
- EndNote Cite While You Write: the AppSource result describes it as an add-in for Word Online that inserts citations and creates a bibliography.
Confirm that the current listing still supports your Word Online workflow and the versions or accounts you use.
Diagrams and presentations
- Lucidchart Diagrams for PowerPoint: surfaced as a diagramming example for PowerPoint.
Check the current listing for supported PowerPoint clients and any account or permission requirements before using it with presentation files.
Spreadsheets and business workflows
- Jira Cloud for Excel: surfaced as an Excel integration example.
- Other spreadsheet tools: AppSource results also surfaced additional tools, but the available information does not identify them well enough to recommend by name here.
For any Excel integration, verify the supported Excel clients and the data or account access it requires.
Meetings and collaboration
- Zoom for Outlook: surfaced as an Outlook meeting-workflow example.
- Zoom for Microsoft Teams: surfaced as a Teams integration example.
- Decisions: surfaced among collaboration and Teams results.
- DeepL Voice for Teams: surfaced as a Teams-related example.
These are distinct host-app contexts. Check the exact listing rather than assuming an Outlook integration also works in Teams, or vice versa.
Email, sales, and signatures
- HubSpot Sales for Teams: surfaced in collaboration results.
- CodeTwo Signatures Add-in for Outlook: surfaced as an Outlook example.
Confirm the supported Outlook or Teams clients and ask your administrator whether organizational policies permit the integration.
How to find and install an add-in
Microsoft Support provides guidance for viewing, managing, and installing add-ins for Excel, PowerPoint, and Word across multiple current and older Microsoft 365 and Office versions. The practical route for an individual user is to look for the add-in store or install option in the relevant Office app, then follow that app’s prompts. If an add-in does not appear, check the app version and the product’s current compatibility information; store visibility can also depend on organizational policy.
The Office Store FAQ covers additional Office application families, including Outlook, Access, Project, and SharePoint. That does not mean every add-in is available in every one of those apps: check the individual listing for its host application and compatibility details.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesHow organizations can deploy add-ins
For central deployment to users and groups, Microsoft Learn identifies the integrated apps portal in the Microsoft 365 admin center as the recommended and most feature-rich method for most customers. Before rollout, an administrator should confirm tenant policy, permissions, target groups, and the vendor’s current deployment instructions.
Best Value
- 💻 ✔️ EVERY ESSENTIAL SHORTCUT - With the SYNERLOGIC Reference Keyboard Shortcut Sticker, you have the most important shortcuts conveniently placed right in front of you. Easily learn new shortcuts and always be able to quickly lookup commands without the need to “Google” it.
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- 💻 ✔️ New adhesive – stronger hold. It may leave a light residue when removed, but this wipes off easily with a soft cloth and warm, soapy water. Fewer air bubbles – for the smoothest finish, don’t peel off the entire backing at once. Instead, fold back a small section, line it up, and press gradually as you peel more. The “peel-and-stick-all-at-once” method only works for thin decals, not for stickers like ours.
- 💻 ✔️ Compatible and fits any brand laptop or desktop running Windows 10 or 11 Operating System.
- 💻 ✔️ Original Design and Production by Synerlogic Electronics, San Diego, CA, Boca Raton, FL and Bay City, MI, United States 2020. All rights reserved, any commercial reproduction without permission is punishable by all applicable laws.
What to verify before choosing one
- Host app and compatibility: check the exact Office app, client, platform, and version—not just the product name.
- Access and privacy: review requested permissions and the vendor’s current privacy terms. Marketplace presence is not an independent security assessment.
- Deployment fit: determine whether users can install it themselves or an administrator must deploy or approve it.
- Price and plan: verify current official vendor terms. Comparable prices and plans are not established for these examples, and they may change.
- Maintenance and availability: confirm that the listing is current and that the vendor documents support for your intended workflow.
This is a task-based shortlist, not an objective ranking or a complete catalog. The examples come from time-sensitive AppSource results, and no independent feature testing or comparable product review is established here.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
