Auth.js on new websites

1. About 1 in 360 websites that went live in the last 30 days use Auth.js (0.3%).^[1]
2. It is 10 times more common among product launches than among other new sites.
3. It is the third most common authentication service on new sites. Google Sign-In appears on about 4 times as many.
4. Almost all new Auth.js sites also use React.

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

#	Movement	Tool	Share of all sites	Share of category	Bar
1	–	Google Sign-In	1.7%	62.4%
2	▲1	Clerk	0.5%	16.8%
3	▼1	Auth.js	0.4%	15.9%
4	–	Google Identity Platform	0.1%	2.3%
5	▲4	Privy	<0.1%	1.1%

All-time shares across the new sites we track: of all of them, and of the sites using any Auth tool. The most common alternatives to Auth.js on new websites are Clerk and Google Identity Platform. All 170 in Auth

Tool	Sites with both	vs all new sites	Bar
Next.js	24,037	6.9x
Vercel	11,924	3.6x
React	24,156	3.5x
Tailwind CSS	20,313	3.2x
Lucide Icons	13,280	3.2x

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

15,373 of the 25,397 sites using Auth.js are product launches we list individually. The other 10,024 are sites we found crawling the wider web: they count towards the figures above, but we do not publish them one by one. They are included in the StackScope API and in Stackdar alerts.

Site	Found	Also detected
WhyStack: Ask your stack why. whystack.ai · Developer Tools · Brazil	Oct 18
LEXAPPLIANCE · Seguridad de la información y protección de datos en un solo programa de cumplimiento lexappliancegrc.com	Oct 18
AiWebWerx — AI-Powered Websites for the Trades Industry aiwebwerx.com · Marketing	Oct 18
My Archery — Own every arrow myarchery.site · Iran	Oct 17
MediRun — Premium Medication Delivery for Africa medirun.app · Health	Oct 17
Untitled site golfcommits.ai	Oct 17
FoodHub chalechop.com · E-commerce	Oct 17
SocialDash getsocialdash.com	Oct 17
Super Simple Drum: Learn drums by watching, not by reading supersimpledrum.com · Education	Oct 17
Sparkyard sparkyardfuture.com · Sweden	Oct 17
YARGI AI | Hukukçular İçin Yapay Zeka e-yargi.com · Türkiye	Oct 17
List Your Game | Indie & Studio Game Directory listyourgame.com	Oct 17

Showing the most recent 12 of 15,373.

The StackScope API serves all 25,397 sites using Auth.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. Green hosting is the share whose web host The Green Web Foundation lists as running on green energy, among sites checked since 1 April 2026, against the same share for every new site we checked over that time. Data from The Green Web Foundation.