Transactional Email Tools
Get told when a new site picks a Transactional Email tool.
Stackdar watches every launch we detect and sends you the ones that ship with anything in Transactional Email, your competitors' tools included, by email, Slack or webhook. On every plan, from £15 a month.
See how alerts workThe most-adopted email transactional tool we track is Resend (146,672 sites). We've detected 150 email transactional tools across 233,111 public sites.
Note (Jul 1, 2026): Adoption figures now count launches from launch platforms. Use the source view to include StackScope Discovery.
Note (Jul 3, 2026): Email provider detection improved: providers identified from mail configuration are now caught on a site's first crawl. Earlier data may slightly undercount.
Transactional Email tools we've detected
| Tool | 90‑day | Sites |
|---|---|---|
Resend
site ↗
Modern transactional email API.
|
146672 | |
SendGrid
site ↗
Twilio SendGrid transactional and marketing email.
|
18097 | |
Amazon SES
site ↗
AWS Simple Email Service receiving endpoint.
|
17378 | |
MailChannels
site ↗
Outbound SMTP relay used by many shared hosts (Cloudflare Workers Email, cPanel hosts) for transactional mail.
|
14206 | |
Mail.Baby
site ↗
Budget transactional and inbound email service from MXroute, aimed at low-volume senders.
|
12162 | |
Postal
site ↗
Open source mail delivery platform that organisations self host to send transactional and bulk email.
|
9861 | |
Mailgun
site ↗
Mailgun transactional email API.
|
9115 | |
Cloudflare Email
site ↗
Outbound transactional email sending service.
|
7448 | |
Firebase Trigger Email
site ↗
Firebase extension that sends transactional email by writing documents to a Firestore collection.
|
3180 | |
EmailJS
site ↗
Client-side email sending SDK. Lets sites trigger transactional email from browser JavaScript without a backend, routing through a configured email service (SendGrid, Mailgun, Gmail, etc).
|
2748 | |
Mailjet
site ↗
Transactional and marketing email service from Sinch.
|
1973 | |
| JetSMTP | 1481 | |
Postmark
site ↗
ActiveCampaign Postmark transactional email API.
|
1166 | |
Mandrill
site ↗
Mailchimp Mandrill transactional email API.
|
916 | |
MailerSend
site ↗
Transactional email API and SMTP service from MailerLite.
|
748 |
Showing top 15 of 150 email transactional tools by adoption. 135 more not shown.
The StackScope API serves every email transactional tool and the launches using each, filterable and exportable, from £15 a month.
Launches using Transactional Email tools
| Launch | Launched | Score |
|---|---|---|
| Scanara | Sep 4, 2026 | 3.7 |
| Someone | Sep 4, 2026 | 7.3 |
| Simple Quiz Maker | Sep 4, 2026 | 10.0 |
| BlurOut | Sep 4, 2026 | 7.6 |
| Deploynix | Sep 4, 2026 | 10.0 |
| WISMO | Sep 4, 2026 | 9.5 |
Often built with
Categories the email transactional sites we track also commonly use: