Sites built with Office.js
JavaScript API library that lets web based Office Add-ins interact with Word, Excel, Outlook and PowerPoint.
Get told when a new site ships with Office.js.
Stackdar watches every launch we detect and sends you the ones using Office.js, by email, Slack or webhook. On every plan, from £15 a month.
See how alerts work47 sites
40 found by StackScope, 7 via launch platforms
- StackScope Discovery (Indie) 20
- StackScope Wider Web 20
- Product Hunt 4
- Hacker News 1
- PeerPush 1
- Other 1
Office.js has been detected on 47 launches we've crawled. The 7-day rolling share is 0.0%, roughly steady week on week. Most recent detection: Valnivo · See where your money could take you in 10, 20 and 30 years, 2 days ago.
It's most commonly paired with HSTS, Microsoft 365, and Vite. By product type, the launches using it are most often Productivity (56%), Finance (26%), and Developer Tools (7%).
What kind of products ship with Office.js
27 launches
Domain endings using Office.js
47 sites
- .com 42.55%
- .ai 12.77%
- .us 8.51%
- .app 6.38%
- .co 4.26%
- .dev 4.26%
Country
11 of 47 sites, where we are semi-confident of the country.
-
United States
54.55%
-
Canada
9.09%
-
Ireland
9.09%
-
India
9.09%
-
Italy
9.09%
-
Luxembourg
9.09%
Share of new sites using Office.js
Each dot is one launch day. Line is the 7-day rolling average. Chart starts at first detection.
The shaded parts of the chart are measured against a different set of sites.
Grey: until 8 July 2026 we only tracked launches from launch platforms. From that date we crawl the wider web as well.
Amber: on 10 September 2026 we improved our infrastructure so we can index new sites much sooner, often on the day they go live. Sites found that early often haven't finished setting up, so anything usually added after launch reads lower from that date. We record each site as it was when we found it.
The share is a proportion of whatever we were tracking at the time, so it can step at these lines without the technology itself changing. For a single continuous measure, switch to launch platforms.
Javascript Library leaders
| Tool | % of launches | % of category | ||
|---|---|---|---|---|
| #1 | – |
jQuery
|
14.40% | 34.98% |
| #2 | – |
React Router
|
6.66% | 16.17% |
| #3 | – |
Motion
|
6.13% | 14.90% |
| #4 | – |
TanStack Router
|
4.33% | 10.52% |
| #5 | – |
Swiper
|
3.57% | 8.67% |
| … | ||||
| #450 | ▲36 | Office.js Current page | <0.01% | <0.01% |
Percentages show adoption among indie launches: the share of all analysed launches, and of launches using any Javascript Library tool.Among September launches it ranked #445 in Javascript Library, up from #481 in August. All 1445 in Javascript Library →
Often used with
| Tool | Sites |
|---|---|
| HSTS | 36 |
Microsoft 365
|
34 |
Vite
|
26 |
Tailwind CSS
|
17 |
Cloudflare
|
16 |
Tools most often detected on the same sites as Office.js.
Recent launches we can show
27 of the 47 sites using Office.js are product launches we list individually. The other 20 are sites we found crawling the wider web: they count towards the figures above, but we do not publish them one by one. How StackScope Discovery works
Sommelier
ReX
One-Time Secret Links for Passwords | SecretBridge
Developer Tools
Almagest AI — Intelligence for limited partners
Finance
OutlookDog
Productivity
Biblion — MEDLINE / PubMed Search
PaperRigor
Productivity
Quotelyra | From inquiry to reply
Finance
Hanay
ComposeCitation | Word Citation Review Add-in
Productivity
AI Contract Review & Redlining Software | Attyflow
Showing the most recent 12 of 27.
The StackScope API serves all 47 sites using Office.js, filterable and exportable, from £15 a month.