---
title: Email & SMS Platforms · Curated Directory | RGM®
url: https://realgrowthmatters.com/appendix/tools/esp-email-sms/
updated: 2026-06-10
source_html: https://realgrowthmatters.com/appendix/tools/esp-email-sms/
---

**About this directory.** Entries are publicly known marketing tools, people, and resources. We provide brief, original descriptions and link to each entity's primary URL. We do not republish third-party pricing, review aggregates, or contact details — visit the entity's own page for the most current information. If you maintain one of these resources and would like to update or correct your listing, contact [hello@realgrowthmatters.com](/contact/).

## 11 entries

[**Klaviyo**

Verified entry

ESP focused on e-commerce, with strong Shopify integration and segmentation.

View deep-dive →](/appendix/tools/esp-email-sms/klaviyo/)[**Braze**

Verified entry

Enterprise customer engagement platform for email, push, in-app, and SMS at scale.

View deep-dive →](/appendix/tools/esp-email-sms/braze/)[**Iterable**

Verified entry

Cross-channel marketing platform for email, SMS, push, and in-app.

View deep-dive →](/appendix/tools/esp-email-sms/iterable/)[**Mailchimp**

Verified entry

Free-tier email marketing platform; standard starting point for small businesses.

View deep-dive →](/appendix/tools/esp-email-sms/mailchimp/)[**ActiveCampaign**

Verified entry

Mid-market email and marketing automation with CRM features.

View deep-dive →](/appendix/tools/esp-email-sms/activecampaign/)[**HubSpot Marketing Hub**

Verified entry

All-in-one inbound marketing platform with email, landing pages, and automation.

View deep-dive →](/appendix/tools/esp-email-sms/hubspot-marketing-hub/)[**Marketo**

Verified entry

Enterprise marketing automation, now part of Adobe.

View deep-dive →](/appendix/tools/esp-email-sms/marketo/)[**Salesforce Marketing Cloud**

Verified entry

Enterprise marketing cloud spanning email, journeys, advertising, and data.

View deep-dive →](/appendix/tools/esp-email-sms/salesforce-marketing-cloud/)[**Customer.io**

Verified entry

Behavioral messaging platform for product-led companies.

View deep-dive →](/appendix/tools/esp-email-sms/customer-io/)[**Attentive**

Verified entry

Conversational text messaging platform for e-commerce.

View deep-dive →](/appendix/tools/esp-email-sms/attentive/)[**Postscript**

Verified entry

SMS marketing platform focused on Shopify e-commerce.

View deep-dive →](/appendix/tools/esp-email-sms/postscript/)

Want to learn how to use these tools?

**RGM's free training covers practical use of every major platform**

Tools are leverage, not strategy. The training shows you how to use these platforms in real campaigns.

[Start the training →](/training/)