Email Detective — ESP Tracker

ESP	Category	Brands	Brand share	Observations	Obs share
SendGrid	transactional	1703	13.1%	16,979	14.4%
Amazon SES	transactional	1525	11.8%	18,920	16.0%
Klaviyo	marketing	1519	11.7%	9,135	7.7%
Mailchimp	marketing	971	7.5%	3,676	3.1%
Salesforce MC	marketing	897	6.9%	6,063	5.1%
Mailgun	transactional	753	5.8%	6,579	5.6%
HubSpot	marketing	745	5.7%	4,663	4.0%
SparkPost	transactional	401	3.1%	3,447	2.9%
Kit	marketing	396	3.1%	2,965	2.5%
Braze	marketing	395	3.0%	3,000	2.5%
Iterable	marketing	395	3.0%	6,693	5.7%
Brevo	marketing	375	2.9%	1,943	1.6%
Substack	marketing	348	2.7%	1,634	1.4%
ActiveCampaign	marketing	264	2.0%	1,677	1.4%
Postmark	transactional	257	2.0%	1,551	1.3%
Customer.io	marketing	249	1.9%	2,834	2.4%
Beehiiv	marketing	226	1.7%	3,487	3.0%
MailerLite	marketing	210	1.6%	795	0.7%
Marketo	marketing	164	1.3%	1,280	1.1%
Bloomreach	marketing	143	1.1%	1,515	1.3%
Shopify Messaging	marketing	137	1.1%	1,237	1.0%
Omnisend	marketing	137	1.1%	850	0.7%
Seguno	marketing	136	1.0%	1,209	1.0%
Adobe Campaign	marketing	129	1.0%	1,111	0.9%
Salesforce CRM	transactional	127	1.0%	1,412	1.2%
Emarsys	marketing	110	0.8%	531	0.5%
Mailjet	transactional	109	0.8%	589	0.5%
Intercom	support	100	0.8%	1,066	0.9%
Smaily	marketing	93	0.7%	430	0.4%
Zendesk	support	88	0.7%	824	0.7%
Sailthru	marketing	82	0.6%	1,326	1.1%
Campaign Monitor	marketing	67	0.5%	370	0.3%
Pepipost	transactional	65	0.5%	450	0.4%
Dotdigital	marketing	62	0.5%	250	0.2%
Acoustic	marketing	61	0.5%	315	0.3%
Keap	marketing	53	0.4%	344	0.3%
Yespo	marketing	53	0.4%	345	0.3%
Responsys	marketing	52	0.4%	309	0.3%
Constant Contact	marketing	49	0.4%	456	0.4%
SALESmanago	marketing	46	0.4%	117	0.1%
Selligent	marketing	39	0.3%	124	0.1%
Sendy	marketing	38	0.3%	108	0.1%
Drip	marketing	36	0.3%	216	0.2%
Kajabi	marketing	34	0.3%	376	0.3%
Deployteq	marketing	33	0.3%	184	0.2%
CleverReach	marketing	31	0.2%	228	0.2%
EmailLabs	transactional	31	0.2%	79	0.1%
Oracle Eloqua	marketing	30	0.2%	150	0.1%
SendPulse	marketing	29	0.2%	94	0.1%
Loops	marketing	28	0.2%	77	0.1%
CleverTap	marketing	27	0.2%	124	0.1%
Zoho Campaigns	marketing	26	0.2%	86	0.1%
EmailOctopus	marketing	24	0.2%	67	0.1%
AWeber	marketing	24	0.2%	187	0.2%
Inboxroad	transactional	24	0.2%	153	0.1%
Cordial	marketing	24	0.2%	343	0.3%
GetResponse	marketing	23	0.2%	74	0.1%
Squarespace	marketing	21	0.2%	62	0.1%
SMTP2GO	transactional	21	0.2%	49	<0.1%
Sarbacane	marketing	21	0.2%	405	0.3%
Resend	transactional	21	0.2%	38	<0.1%
Mailersend	transactional	19	0.1%	87	0.1%
Ometria	marketing	19	0.1%	121	0.1%
Spotler	marketing	18	0.1%	59	0.1%
Edrone	marketing	18	0.1%	26	<0.1%
Systeme.io	marketing	16	0.1%	33	<0.1%
rapidmail	marketing	16	0.1%	133	0.1%
Epsilon	enterprise	16	0.1%	65	0.1%
MDirector	marketing	16	0.1%	49	<0.1%
Bluecore	marketing	15	0.1%	58	<0.1%
Flodesk	marketing	15	0.1%	28	<0.1%
Ghost	marketing	14	0.1%	136	0.1%
Bento	marketing	13	0.1%	57	<0.1%
Wix	marketing	13	0.1%	72	0.1%
Strato	transactional	13	0.1%	37	<0.1%
Emma	marketing	13	0.1%	36	<0.1%
Microsoft Dynamics	marketing	12	0.1%	39	<0.1%
Inxmail	marketing	11	0.1%	100	0.1%
Connectif	marketing	11	0.1%	17	<0.1%
Encharge	marketing	10	0.1%	31	<0.1%
Elastic Email	transactional	10	0.1%	25	<0.1%
Kartra	marketing	9	0.1%	21	<0.1%
GreenArrow	transactional	9	0.1%	34	<0.1%
EcoSend	marketing	9	0.1%	29	<0.1%
ExpertSender	marketing	8	0.1%	35	<0.1%
ActiveTrail	marketing	7	0.1%	20	<0.1%
KlickTipp	marketing	7	0.1%	51	<0.1%
Pardot	marketing	7	0.1%	48	<0.1%
Mailtrap	transactional	6	<0.1%	53	<0.1%
Retarus	transactional	6	<0.1%	59	0.1%
Airship	marketing	6	<0.1%	121	0.1%
Benchmark	marketing	6	<0.1%	140	0.1%
Userlist	marketing	6	<0.1%	34	<0.1%
Moosend	marketing	6	<0.1%	18	<0.1%
Maileroo	transactional	5	<0.1%	30	<0.1%
SAP Marketing Cloud	marketing	5	<0.1%	10	<0.1%
Listrak	marketing	5	<0.1%	15	<0.1%
Revinate	marketing	5	<0.1%	6	<0.1%
SocketLabs	transactional	4	<0.1%	5	<0.1%
HCL Domino	transactional	4	<0.1%	27	<0.1%
XCAMPAIGN	marketing	4	<0.1%	10	<0.1%
SendFox	marketing	3	<0.1%	14	<0.1%
Vero	marketing	3	<0.1%	9	<0.1%
Agnitas	marketing	3	<0.1%	38	<0.1%
Ecomail	marketing	3	<0.1%	3	<0.1%
Magnews	marketing	3	<0.1%	20	<0.1%
CCM Benchmark	enterprise	3	<0.1%	98	0.1%
OneSignal	marketing	3	<0.1%	6	<0.1%
mailingwork	marketing	3	<0.1%	4	<0.1%
SAS CI360	enterprise	3	<0.1%	9	<0.1%
dEngage	marketing	3	<0.1%	6	<0.1%
Retail Rocket	marketing	2	<0.1%	10	<0.1%
Optimizely Campaign	marketing	2	<0.1%	6	<0.1%
Blackbaud	marketing	2	<0.1%	5	<0.1%
Mailcoach	marketing	2	<0.1%	34	<0.1%
WombatMail	marketing	2	<0.1%	45	<0.1%
Pipedrive	marketing	2	<0.1%	5	<0.1%
Lindris	transactional	2	<0.1%	7	<0.1%
Positive User	marketing	2	<0.1%	18	<0.1%
Kajomi	marketing	1	<0.1%	2	<0.1%
Newsletter2Go	marketing	1	<0.1%	1	<0.1%
Mandrill	transactional	1	<0.1%	1	<0.1%
Easymailing	marketing	1	<0.1%	1	<0.1%
Creatio	marketing	1	<0.1%	2	<0.1%
Help Scout	support	1	<0.1%	1	<0.1%
MailPoet	marketing	1	<0.1%	2	<0.1%
Robly	marketing	1	<0.1%	2	<0.1%

127 ESPs shown. Click any name for the full detail page (placement, infrastructure, brands, IPs).

About the share columns: Brand share = % of brands in the current filter that use this ESP (sums to >100% because brands often use multiple ESPs). Obs share = % of total send volume from this ESP. Each "observation" is one email an Email Detective user opened. Both are share-of-inbox among our users — not global market share. Sample is biased toward our user demographic and what they actually open.