ClrStream
5.9#39 in transactional email servicesWebAPI
VisitClrStream vs Postmark
What both publish
| Fact | ClrStream | Postmark |
|---|---|---|
| Company history | Mithi's company timeline lists ClrStream among its products in 2018 and identifies ClrStream 2.5 in 2024. | Postmark says it has delivered billions of emails since 2010. |
| Integrations | ClrStream integrates with directory services, Vaultastic, ERP, CRM, core banking, and other business applications through APIs and open protocols. | Official integrations include Slack, Zapier, Stripe, WordPress, Supabase, Bubble, Craft CMS, Netlify, and Gravity Forms. |
| Security | The maker describes spam, virus, and malware protection with a 7-layer security architecture and real-time threat mitigation. | Postmark supports TLS and HTTPS, DKIM, SPF, DMARC, two-factor authentication, API permission controls, penetration testing, and DDoS protection. |
| Support | The maker offers access to a help desk, solution architects, and scheduled product demonstrations. | Postmark offers support by email, live chat, and one-on-one calls and reports a 95% customer happiness rating. |
| What it does | ClrStream is an enterprise email notification platform for automating high-volume customer and stakeholder communications. | Postmark delivers and tracks application email as a replacement for SMTP or Sendmail. |
ClrStream plans
- Contract—
- Pay per usePriced on request
Postmark plans
- FreeFree
- Basic$15 a month
- Pro$16.50 a month
- Platform$18 a month
- Custom activity retention$5 a month
- DMARC monitoring$14 a month
Pick ClrStream if…
You want what its maker publishes above — check its page for the details.
Pick Postmark if…
Postmark suits developers who need to send application email through an API or SMTP and track delivery events. Its inbound processing and message streams also suit services handling both incoming and different types of outgoing email.