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Microsoft Office Add-ins on new websites

Microsoft Office Add-ins platform (Office.js), including its telemetry endpoint.

Sites using Microsoft Office Add-ins
3
since Sep 2026
Last 30 days
0.0%
of new sites, to Oct 19
no change on the 30 days before
Last 7 days
0.0%
of new sites, 7-day average
no change on the week before
Rank in Developer Tools
#228
of 506 tools, all time
First seen Sep 20, 2026
Last seen Sep 30, 2026
Website learn.microsoft.com

What we found

  1. Microsoft Office Add-ins appeared on 3 new sites in the last 30 days.[1]

Share of new sites using Microsoft Office Add-ins

0.0000% 0.0002% 0.0004% 0.0006% 0.0008% 13 Sep Oct

The line is the 7-day average share of new sites that use Microsoft Office Add-ins, since 13 September. It starts at our first detection.

Developer Tools on new sites

# Movement Tool Share of all sites Share of category Bar
1 – Vite 23.7% 98.5%
2 – pywb (Wayback Machine toolkit) 0.1% 0.3%
3 ▲1 Instant.page 0.1% 0.2%
4 ▼1 Weglot <0.1% 0.2%
5 ▲2 Rack CORS <0.1% 0.1%
…
228 Microsoft Office Add-ins <0.1% <0.1%

All-time shares across the new sites we track: of all of them, and of the sites using any Developer Tools tool. All 506 in Developer Tools

Recently launched products built on Microsoft Office Add-ins

1 of the 3 sites using Microsoft Office Add-ins are product launches we list individually. The other 2 are new business and personal sites: they count towards the figures above but are not listed here. A watch sends them to you.

Site Found Also detected
ReX aquamarine-salamander-d9e5a5.netlify.app Sep 20 React Netlify Clerk Cloudflare

Watches, exports and the API give you all 3 sites using Microsoft Office Add-ins, from £15 a month.

Notes

  1. These figures cover websites that went live since April 2026, not the web as a whole.

How this page is made

FirstSited looks at each new website near the day it goes live and records what it was built with. We do not go back later, so these figures describe what sites launch with, not what they run today. A site counts towards Microsoft Office Add-ins when we detect Microsoft Office Add-ins on it at that look.

Every share on this page is a proportion of the new sites we were tracking at the time. Sites we found across the wider web count towards the figures, but only product launches are listed by name. How we detect technologies ยท How we find new sites

Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.