Mailcheck on new websites
JavaScript library that suggests corrections for likely typos in email domains.
- Sites using Mailcheck
- 11,570
- since May 2026
- Last 30 days
- 0.2%
-
of new sites, to Oct 19
no change on the 30 days before - Last 7 days
- 0.2%
- of new sites, 7-day average
no change on the week before
| First seen | May 26, 2026 |
|---|---|
| Last seen | Oct 20, 2026 |
| Website | github.com |
What we found
- About 1 in 470 websites that went live in the last 30 days were built with Mailcheck (0.2%).[1]
- Almost all new Mailcheck sites also use jQuery.
- It is unusually common among marketing launches: 16%, against 7.1% across new sites.
Share of new sites using Mailcheck
The line is the 7-day average share of new sites that use Mailcheck, since 10 September.
Who uses Mailcheck
| Type | Sites | Share | Bar |
|---|---|---|---|
| E-commerce | 828 | 29.9% | |
| Health | 518 | 18.7% | |
| Marketing | 442 | 16.0% | |
| Finance | 212 | 7.7% | |
| Education | 199 | 7.2% | |
| Content | 131 | 4.7% | |
| Games | 79 | 2.9% | |
| Developer Tools | 73 | 2.6% | |
| Social | 70 | 2.5% | |
| Design | 61 | 2.2% | |
| Productivity | 60 | 2.2% | |
| Hiring & HR | 38 | 1.4% |
| Country | Sites | Share | Bar |
|---|---|---|---|
 India |
504 | 19.4% | |
 UK |
382 | 14.7% | |
 France |
317 | 12.2% | |
 US |
274 | 10.5% | |
 Canada |
169 | 6.5% | |
 Sweden |
127 | 4.9% | |
 Italy |
104 | 4.0% | |
 Australia |
101 | 3.9% | |
 Slovakia |
68 | 2.6% | |
 Germany |
59 | 2.3% | |
 Switzerland |
53 | 2.0% | |
 Poland |
48 | 1.9% |
| Ending | Sites | Share | Bar |
|---|---|---|---|
| .com | 7,405 | 64.0% | |
| .in | 808 | 7.0% | |
| .uk | 439 | 3.8% | |
| .online | 337 | 2.9% | |
| .fr | 325 | 2.8% | |
| .org | 307 | 2.7% | |
| .ca | 237 | 2.1% | |
| .site | 183 | 1.6% | |
| .store | 146 | 1.3% | |
| .net | 127 | 1.1% | |
| .se | 119 | 1.0% | |
| .co | 115 | 1.0% |
| Sites | Green | Bar |
|---|---|---|
| Mailcheck | 70% | |
| All new sites | 47% |
Javascript Library on new sites
| # | Movement | Tool | Share of category[4] | Bar | |
|---|---|---|---|---|---|
| 1 | – |
jQuery
|
34.5% | ||
| 2 | – |
React Router
|
16.2% | ||
| 3 | – |
Motion
|
14.6% | ||
| 4 | – |
TanStack Router
|
10.8% | ||
| 5 | – |
Swiper
|
8.3% | ||
| … | |||||
| 43 | ▲1 |
Mailcheck
|
0.5% | ||
All-time shares across the new sites we track: of all of them, and of the sites using any Javascript Library tool. Mailcheck is typically used alongside jQuery rather than instead of it. All 1551 in Javascript Library
Often used with Mailcheck
| Tool | Sites with both | vs all new sites |
|---|---|---|
WPForms
|
9,856 | 392x |
Underscore.js
|
4,444 | 39x |
Elementor
|
7,570 | 13x |
WordPress
|
11,269 | 7.9x |
|
jQuery
|
11,535 | 7.1x |
Tools that turn up far more often on Mailcheck sites than on new sites in general, and how many times as common each one is there.
Recently launched products built on Mailcheck
117 of the 11,570 sites using Mailcheck are product launches we list individually. The other 11,453 are new business and personal sites: they count towards the figures above but are not listed here. A watch sends them to you.
-
PaperBark
paperbark.eu
-
ISPMate
ispmate.com
-
Smile-With-Ace
smilewithace.com
-
accountcn.com
accountcn.com
-
LPT Skills
lptskills.com
-
Play More African Herbs
playmoreafrican.com
Czechia
United Arab Emirates
Philippines
Showing the most recent 12 of 117.
Watches, exports and the API give you all 11,570 sites using Mailcheck, from £15 a month.
Notes
- These figures cover websites that went live since April 2026, not the web as a whole.
- 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.
- 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.
- 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 Mailcheck when we detect Mailcheck 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