Sites built with MP4Box.js
JavaScript library for parsing and segmenting ISO Base Media File Format video in the browser.
Found via: StackScope Discovery (Indie) 3 · StackScope Wider Web 5
MP4Box.js has been detected on 8 launches since first appearing in July 2026. Most recent detection: MultiCut: Cut multicam sets automatically, 5 days ago.
Share of new sites using MP4Box.js
Each dot is one launch day. Line is the 7-day rolling average. Chart starts at first detection.
The shaded part of the chart is measured against a different set of sites. Until 8 July 2026 we only tracked launches from launch platforms; from that date we crawl the wider web as well. The share is a proportion of whatever we were tracking at the time, so it can step at that line without the technology itself changing. For a single continuous measure, switch to launch platforms.
Javascript Library leaders
| Tool | % of launches | % of category | ||
|---|---|---|---|---|
| #1 | – |
jQuery
|
14.22% | 34.47% |
| #2 | – |
React Router
|
6.83% | 16.56% |
| #3 | – |
Motion
|
6.77% | 16.41% |
| #4 | – |
TanStack Router
|
4.23% | 10.26% |
| #5 | – |
Swiper
|
3.60% | 8.73% |
| … | ||||
| #694 | ▼215 | MP4Box.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 August launches it ranked #713 in Javascript Library, down from #498 in July. All 1055 in Javascript Library →
Recent launches we can show
3 of the 8 sites using MP4Box.js are product launches we list individually. The other 5 are sites we found crawling the wider web: they count towards the figures above, but we do not publish them one by one.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
The StackScope API serves all 8 sites using MP4Box.js, filterable and exportable, from £15 a month.