flv.js on new websites
Open source JavaScript library that plays FLV video in the browser using Media Source Extensions.
- Sites using flv.js
- 852
- since Jul 2026
- Last 30 days
- 772
-
new sites, to Nov 11
22 in the 30 days before - Last 7 days
- 724
-
new sites
37 in the week before
| First seen | Jul 29, 2026 |
|---|---|
| Last seen | Nov 12, 2026 |
| Website | github.com |
What we found
- flv.js appeared on about 770 new sites in the last 30 days.[1]
- Almost all new flv.js sites also use hls.js.
Share of new sites using flv.js
The line is the 7-day average share of new sites that use flv.js, since 10 September.
Who uses flv.js
| Type | Sites | Share | Bar |
|---|---|---|---|
| E-commerce | 51 | 23.9% | |
| Health | 51 | 23.9% | |
| Content | 25 | 11.7% | |
| Education | 23 | 10.8% | |
| Marketing | 15 | 7.0% | |
| Finance | 14 | 6.6% | |
| Social | 9 | 4.2% | |
| Games | 8 | 3.8% | |
| Design | 7 | 3.3% | |
| Hiring & HR | 4 | 1.9% | |
| Developer Tools | 3 | 1.4% | |
| Productivity | 2 | 0.9% |
| Country | Sites | Share | Bar |
|---|---|---|---|
 US |
20 | 20.4% | |
 Spain |
10 | 10.2% | |
 France |
8 | 8.2% | |
 UK |
8 | 8.2% | |
 Italy |
8 | 8.2% | |
 Brazil |
7 | 7.1% | |
 Germany |
5 | 5.1% | |
 Slovakia |
5 | 5.1% | |
 Canada |
4 | 4.1% | |
 India |
4 | 4.1% | |
 Poland |
3 | 3.1% | |
 Australia |
2 | 2.0% |
| Ending | Sites | Share | Bar |
|---|---|---|---|
| .com | 535 | 64.8% | |
| .org | 33 | 4.0% | |
| .fr | 29 | 3.5% | |
| .uk | 24 | 2.9% | |
| .net | 20 | 2.4% | |
| .ch | 16 | 1.9% | |
| .it | 16 | 1.9% | |
| .live | 15 | 1.8% | |
| .in | 14 | 1.7% | |
| .sk | 11 | 1.3% | |
| .online | 9 | 1.1% | |
| .co | 7 | 0.9% |
Javascript Library on new sites
| # | Movement | Tool | Share of category[4] | Bar | |
|---|---|---|---|---|---|
| 1 | – |
jQuery
|
34.1% | ||
| 2 | – | jQuery Migrate | 18.7% | ||
| 3 | – |
React Router
|
15.9% | ||
| 4 | ▼1 |
Motion
|
13.8% | ||
| 5 | ▲1 |
TanStack Router
|
11.0% | ||
| 6 | ▼1 |
Swiper
|
8.0% | ||
| 7 | ▲1 |
ES Module Shims
|
7.2% | ||
| 8 | – |
js-cookie
|
6.1% | ||
| 9 | ▼1 |
Modernizr
|
5.7% | ||
| 10 | ▲1 |
GSAP
|
4.7% | ||
| 11 | ▲1 |
Lenis
|
3.4% | ||
| 12 | ▲3 |
Three.js
|
3.2% | ||
| … | |||||
| 209 | ▼15 |
flv.js
|
<0.1% | ||
All-time shares across the new sites we track: of all of them, and of the sites using any Javascript Library tool. flv.js is typically used alongside jQuery rather than instead of it. Among October launches it ranked #466 in Javascript Library, down from #451 in September. All 1832 in Javascript Library
Often used with flv.js
| Tool | Sites with both | vs all new sites |
|---|---|---|
hls.js
|
796 | 898x |
MediaElement.js
|
736 | 384x |
jQuery UI
|
360 | 150x |
Twemoji
|
350 | 82x |
| jQuery Migrate | 682 | 11x |
Tools that turn up far more often on flv.js sites than on new sites in general, and how many times as common each one is there.
Recently launched products built on flv.js
4 of the 852 sites using flv.js are product launches we list individually. The other 848 are new business and personal sites: they count towards the figures above but are not listed here. A watch sends them to you.
-
EZY PMP
ezypmp.com
-
Emotional Mastery App
optimalthinking.com
-
A M Steel & Metal Company
amfasteners.com
Watches, exports and the API give you all 852 sites using flv.js, from £15 a month.
Notes
- These figures cover websites that went live since April 2026, not the web as a whole.
- 4 November 2026: Detection widened: we now also find this technology inside a site's own scripts. Launches crawled before this date may undercount. The dashed line on the chart marks the day.
- 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. We count a country only where it is stated plainly enough to be sure: a governing-law clause or company registration number on a legal page, a phone country code, or a country domain ending. Sites that publish none are not counted at all.
- 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 flv.js when we detect flv.js 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