Basil.js on new websites

1. Basil.js appeared on about 200 new sites in the last 30 days.^[1]
2. Almost all new Basil.js sites also use Kiwi Sizing.
3. It is unusually common among e-commerce launches: 88%, against 21% across new sites.

The line is the 7-day average share of new sites that use Basil.js, day by day for the last 90 days and weekly before that (left of the dashed line). It starts at our first detection. The shaded areas were measured against a different set of sites, so the line can step there without Basil.js itself changing.^[2][3]

#	Movement	Tool	Share of all sites	Share of category[5]	Bar
1	–	jQuery	14.1%	34.4%
2	–	React Router	6.6%	16.2%
3	–	Motion	6.0%	14.6%
4	–	TanStack Router	4.4%	10.7%
5	–	Swiper	3.4%	8.3%
…
177	▼3	Basil.js	<0.1%	<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 September launches it ranked #162 in Javascript Library, down from #159 in August. All 1548 in Javascript Library

Tool	Sites with both	vs all new sites	Bar
Kiwi Sizing	748	1698x
Shopify	747	17x
Google Domains DNS	369	16x
WebMCP	458	14x
Facebook Pixel	342	13x

Tools that turn up far more often on Basil.js sites than on new sites in general, and how many times as common each one is there.

None of them is a product launch we list individually, so there is nothing to show here. They still count towards the figures above. How StackScope Discovery works

The StackScope API serves all 768 sites using Basil.js, filterable and exportable, from £15 a month.

1. These figures cover websites that went live since April 2026, not the web as a whole.
2. Grey: before 8 July 2026, we only tracked launches from launch platforms. From that date we crawl the wider web as well, so the share is measured against a much larger set of sites. For one continuous measure, view launch platforms only.
3. Amber: 8 July to 10 September 2026, before we improved our infrastructure to 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 10 September. We record each site as it was when we found it.
4. 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.
5. Some products people expect to see here are filed under a related category: UI Library.