How many companies use Constant Contact Mail?

TechLeads currently detects Constant Contact Mail on 18,013 websites.

Who are Constant Contact Mail's biggest competitors?

By number of websites, the largest Marketing Platform technologies besides Constant Contact Mail are Sendgrid (522,101), Sendinblue (190,288), MailJet (183,055), Campaign Monitor (11,348), AWeber Email (10,448).

Which companies use Constant Contact Mail?

Websites using Constant Contact Mail include wpengine.com, vancouver.ca, nj.gov, illinois.edu, duke.edu, kdd.org. The full list of 18,013 websites can be exported as a CSV for $29.

Constant Contact Mail market share and customers

As of October 8, 2026, Constant Contact Mail is used by 18,013 websites in the TechLeads index: 1.9% of all Marketing Platform detections, the 4th most-used of 106 Marketing Platform technologies.

18,013

websites using Constant Contact Mail

1.9%

share of Marketing Platform

of 106 in Marketing Platform

Cite this data

Quoting these numbers? Credit TechLeads with a link to this page.

Citation

TechLeads. "Constant Contact Mail Customers and Market Share." Data as of October 8, 2026. https://techleads.fyi/technology/constant-contact-mail/market-share

HTML link

<a href="https://techleads.fyi/technology/constant-contact-mail/market-share">Constant Contact Mail market share (TechLeads data)</a>

Constant Contact Mail vs competitors in Marketing Platform

Websites using each technology in the TechLeads index, and its share of all Marketing Platform detections.

#	Technology	Websites	Share
1	Sendgrid	522,101	55.0%
2	Sendinblue	190,288	20.0%
3	MailJet	183,055	19.3%
4	Constant Contact Mail	18,013	1.9%
5	Campaign Monitor	11,348	1.2%
6	AWeber Email	10,448	1.1%
7	EKM Email Marketing

Constant Contact Mail customers by country

Based on country-code domains (such as .de or .co.uk); websites on .com and other generic domains are not assigned a country.

US81
CA3
GB1
EN1
ES1

Companies using Constant Contact Mail

wpengine.com
vancouver.ca
nj.gov
illinois.edu · University of Illinois Urbana-Champaign
duke.edu
kdd.org
lasvegassun.com · Las Vegas Sun
chl.ca
ballparkdigest.com · Ballpark Digest
altogas.com · Altogas
museumoffloridahistory.com
uncpress.org · University of North Carolina Press

See all 18,013 websites using Constant Contact Mail or download the full list as a CSV for $29.

How these numbers are calculated

TechLeads scans public websites and detects Constant Contact Mail from signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Market share is Constant Contact Mail's website count divided by the website counts of all Marketing Platform technologies we track; a site using two Marketing Platform tools counts for both. Counts were last refreshed on October 8, 2026 and update daily.

FAQ

Constant Contact Mail accounts for 1.9% of Marketing Platform detections in the TechLeads index (18,013 websites), which makes it the 4th most-used of 106 Marketing Platform technologies we track.