Substack on new websites

1. Substack appeared on about 840 new sites in the last 30 days.^[1]
2. It is the most common publishing platform on new sites, more than twice as common as the next, Open Journal Systems.
3. Six in ten new Substack sites also use Sentry.
4. It is unusually common among content launches: 58%, against 6.9% across new sites.

The line is the 7-day average share of new sites that use Substack, since 10 September.

#	Movement	Tool	Share of all sites	Share of category	Bar
1	–	Substack	0.1%	49.7%
2	–	Open Journal Systems	<0.1%	11.8%
3	▲2	Facebook Instant Articles	<0.1%	4.6%
4	▼1	FeedBurner	<0.1%	4.2%
5	▼2	Heyzine	<0.1%	2.6%

All-time shares across the new sites we track: of all of them, and of the sites using any Publishing tool. All 147 in Publishing

Tool	Sites with both	vs all new sites	Bar
Norton Safe Web	1,886	1589x
AWS ALB	1,885	229x
Express	1,893	34x
Cloudflare Web Analytics	1,482	18x
shadcn/ui	1,859	17x

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

253 of the 3,328 sites using Substack are product launches we list individually. The other 3,075 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	Also detected
Showfolio: Link in bio for creators and businesses showfolio.bio · Marketing	Oct 19
GTM Operators gtmoperators.ai	Oct 19
The NICU Mentor thenicumentor.com	Oct 19
The Substantiation File — a free weekly from ClaimFacts claimfacts.co	Oct 19
MarketDeck marketdeck.in · Finance · India	Oct 18
Spin-off calendar and research, US and Europe | Every Spin-Off everyspinoff.com	Oct 18
48-hour build-first AI engineering intensive tslintelligence.com · Education · United States	Oct 17
TSL Intelligence Lab — Research, education and open-source software for building with agentic AI tslintelligence.com · United States	Oct 16
The Raising Sun — Japanese startup funding, in English theraisingsun.com · Finance	Oct 16
Me vs my AI · FPL mevsmyai.com · Games	Oct 16
The Loadout · What's new in AI, and whether you should care. theloadout.fyi	Oct 16
StonerCents.com stonercents.com · Crypto	Oct 15

Showing the most recent 12 of 253.

Watches, exports and the API give you all 3,328 sites using Substack, from £15 a month.

1. These figures cover websites that went live since April 2026, not the web as a whole.
2. 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.
3. 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.