Best Transactional Software - Certified 2026 Directory

BulkEmailr

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Top Choice

SendGrid

4.1

•SCALE · API

Email API and SMTP relay for developers

Free (up to 1,000 subs)

Free plan option available

SMTP relay & high-deliverability API

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Loops

4.7

•SAAS · TRANSACTIONAL

Email for SaaS products

Free (up to 1,000 subs)

SaaS email platform with modern workflow builder

Robust Stripe & API event-driven triggers

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Customer.io

4.5

•BEHAVIOURAL · SAAS

Behavioral email automation for products

From $100/mo

Powerful behavioral triggers based on product events

Omnichannel outreach: Email, push, SMS & in-app

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Brevo

4.5

•MARKETING + TRANSACTIONAL

All-in-one platform with unlimited contacts and SMS marketing.

Free Plan Available

Free plan with unlimited contacts (300 emails/day)

All-in-one CRM, SMS marketing & web chat

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Buttondown

4.7

•NEWSLETTER · CREATORS

Minimalist, Markdown-first newsletter platform for writers and creators.

Free (up to 100 subs)

Free plan up to 100 subscribers

Markdown-first, distraction-free editing

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Mailcoach

4.6

•SELF HOSTED · DEVELOPER

Self-hosted email marketing for developers

From $199/mo

Starting paid tiers from $199/mo

SMTP relay & high-deliverability API

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Textmagic

4.6

•SMS · DRAG AND DROP

Simple pay-as-you-go bulk SMS and email marketing for businesses.

Free (up to 1,000 subs)

Free plan option available

Marketing automation & segmentation

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Twilio SendGrid (Advanced)

4.2

•ENTERPRISE · API

Enterprise email API for high-volume senders

From $89.95/mo

Starting paid tiers from $89.95/mo

SMTP relay & high-deliverability API

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Vero

4.2

•BEHAVIORAL · EVENT TRIGGERED

Event-triggered email for product and data teams

From $99/mo

Starting paid tiers from $99/mo

SMTP relay & high-deliverability API

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Netcore Email

4.1

•ENTERPRISE · DELIVERABILITY

Email API and marketing for enterprises

Contact Sales

SMTP relay & high-deliverability API

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MailerCloud

•AFFORDABLE · BULK

Affordable bulk email for agencies and senders

From $19/mo

Starting paid tiers from $19/mo

SMTP relay & high-deliverability API

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Mailjet

3.9

•COLLABORATIVE · TEAM

Collaborative email for teams

Free (up to 1,000 subs)

Free plan option available

SMTP relay & high-deliverability API

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Elastic Email

3.9

•AFFORDABLE · BULK

Affordable bulk email API and marketing

Free (up to 1,000 subs)

Free plan option available

SMTP relay & high-deliverability API

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