symbol-observable on new websites
Small JavaScript ponyfill that provides Symbol.observable so observable libraries can work together.
- Sites using symbol-observable
- 410
- since Sep 2026
- Last 30 days
- 0.0%
-
of new sites, to Nov 5
no change on the 30 days before - Last 7 days
- 0.1%
- of new sites, 7-day average
+0.1 pts on the week before
| First seen | Sep 3, 2026 |
|---|---|
| Last seen | Nov 6, 2026 |
| Website | github.com |
What we found
- symbol-observable appeared on about 360 new sites in the last 30 days.[1]
- Almost all new symbol-observable sites also use Canva.
Share of new sites using symbol-observable
The line is the 7-day average share of new sites that use symbol-observable, since 10 September.
Who uses symbol-observable
| Type | Sites | Share | Bar |
|---|---|---|---|
| Health | 12 | 23.5% | |
| Marketing | 8 | 15.7% | |
| Content | 6 | 11.8% | |
| Design | 5 | 9.8% | |
| Education | 5 | 9.8% | |
| E-commerce | 4 | 7.8% | |
| Finance | 4 | 7.8% | |
| Developer Tools | 3 | 5.9% | |
| Social | 2 | 3.9% | |
| Crypto | 1 | 2.0% | |
| Games | 1 | 2.0% |
| Country | Sites | Share | Bar |
|---|---|---|---|
 US |
41 | 61.2% | |
 UK |
9 | 13.4% | |
 Canada |
4 | 6.0% | |
 Brazil |
3 | 4.5% | |
 France |
3 | 4.5% | |
 Puerto Rico |
2 | 3.0% | |
 India |
1 | 1.5% | |
 Mexico |
1 | 1.5% | |
 Poland |
1 | 1.5% | |
 Serbia |
1 | 1.5% | |
 Slovakia |
1 | 1.5% |
| Ending | Sites | Share | Bar |
|---|---|---|---|
| .com | 296 | 79.8% | |
| .site | 17 | 4.6% | |
| .net | 12 | 3.2% | |
| .org | 12 | 3.2% | |
| .uk | 7 | 1.9% | |
| .store | 5 | 1.4% | |
| .ca | 3 | 0.8% | |
| .fr | 3 | 0.8% | |
| .online | 3 | 0.8% | |
| .br | 2 | 0.5% | |
| .agency | 1 | 0.3% |
Javascript Library on new sites
| # | Movement | Tool | Share of category[3] | Bar | |
|---|---|---|---|---|---|
| 1 | – |
jQuery
|
34.3% | ||
| 2 | – | jQuery Migrate | 18.8% | ||
| 3 | – |
React Router
|
16.1% | ||
| 4 | ▼1 |
Motion
|
14.1% | ||
| 5 | ▲1 |
TanStack Router
|
11.0% | ||
| 6 | ▼1 |
Swiper
|
8.1% | ||
| 7 | ▲1 |
ES Module Shims
|
7.1% | ||
| 8 | – |
js-cookie
|
6.1% | ||
| 9 | ▼1 |
Modernizr
|
5.8% | ||
| 10 | ▲1 |
GSAP
|
4.7% | ||
| 11 | ▲1 |
Lenis
|
3.4% | ||
| 12 | ▲3 |
Three.js
|
3.2% | ||
| … | |||||
| 256 | ▲426 |
symbol-observable
|
<0.1% | ||
All-time shares across the new sites we track: of all of them, and of the sites using any Javascript Library tool. Among October launches it ranked #367 in Javascript Library, up from #793 in September. All 1713 in Javascript Library
Often used with symbol-observable
| Tool | Sites with both | vs all new sites |
|---|---|---|
| MobX | 321 | 11780x |
Canva
|
376 | 177x |
Web Font Loader
|
204 | 152x |
System DNS
|
248 | 140x |
Google Sign-In
|
376 | 53x |
Tools that turn up far more often on symbol-observable sites than on new sites in general, and how many times as common each one is there.
Recently launched products built on symbol-observable
1 of the 410 sites using symbol-observable are product launches we list individually. The other 409 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 |
|---|---|
| heir First Term Sheet medium.com · Finance | Nov 5 |
Watches, exports and the API give you all 410 sites using symbol-observable, from £15 a month.
Notes
- These figures cover websites that went live since April 2026, not the web as a whole.
- Country comes from what each site says about itself, such as a company registration, legal terms or a phone number, not just its domain ending. Too few sites state their country plainly for the usual count, so this one also counts single signals: a country domain ending, a phone number (for North America, its area code), a location the site declares in its own page metadata, or a country-specific vendor stack and the page language where they agree and nothing contradicts them. Read these as likely rather than certain.
- Some products people expect to see here are filed under a related category: UI Library.
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 symbol-observable when we detect symbol-observable 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 · How we find new sites