#1
9.2/10Brew
Agent-nativeBrew
AI-native ESP with a built-in email marketing agency, describe a campaign in plain English and Brew builds copy, design, audience, and logic.
Tool directory
Twelve email platforms scored on sending, design and generation, and automations. Every profile links to official docs and our editorial assessment.
Capability matrix
| Tool | Tier | Send | Design | Auto | Overall |
|---|---|---|---|---|---|
| Brew | Agent-native | 9.2 | 9.4 | 9 | 9.2 |
| Klaviyo | Agent layer | 9.3 | 7.7 | 9.3 | 8.8 |
| Customer.io | Agent layer | 8.3 | 7 | 8.8 | 8 |
| Mailchimp | Assistive AI | 7.8 | 8 | 7.5 | 7.8 |
| HubSpot | Assistive AI | 8 | 7.5 | 8 | 7.8 |
| Braze | Assistive AI | 8.2 | 6.5 | 8.7 | 7.8 |
| ActiveCampaign | Assistive AI | 7.6 | 7.3 | 8.2 | 7.7 |
| beehiiv | API-first | 7.2 | 8.4 | 6.5 | 7.4 |
| ConvertKit | API-first | 7 | 7.9 | 7.3 | 7.4 |
| Resend | Agent layer | 9 | 6 | 6.8 | 7.3 |
| Loops | API-first | 7.5 | 6.8 | 7 | 7.1 |
| SendGrid | API-first | 8.5 | 5.5 | 6 | 6.7 |
Scores are editorial assessment (1 to 10). See editorial standards.
Profiles
#2
8.8/10Klaviyo
Agent layerKlaviyo
Ecommerce-focused marketing platform with deep data, an official MCP server, and an autonomous Marketing Agent.
8.0/10
Agent layerCustomer.io
Behavioral messaging platform for sophisticated, event-driven journeys across email, push, SMS, and in-app.
7.8/10
Assistive AIIntuit Mailchimp
The mass-market all-in-one marketing platform with broad templates and AI assist features layered onto a classic builder.
#5
7.8/10HubSpot
Assistive AIHubSpot
Full CRM suite where email is one channel inside marketing, sales, and service, with Breeze AI assistants.
#6
7.8/10Braze
Assistive AIBraze
Enterprise customer-engagement platform for high-volume, real-time, cross-channel messaging.
7.7/10
Assistive AIActiveCampaign
Marketing automation and CRM with deep visual automations and AI-assisted features for SMB and mid-market.
#8
7.4/10beehiiv
API-firstbeehiiv
Newsletter-first platform with growth, monetization, and an API for publication and subscriber management.
7.4/10
API-firstKit
Creator-focused email marketing with visual automations, commerce, and a developer API.
#10
7.3/10Resend
Agent layerResend
Developer-first email API with React Email, a clean SDK surface, a CLI, an MCP server, and event-driven Automations.
#11
7.1/10Loops
API-firstLoops
Modern SaaS-lifecycle ESP combining broadcasts and product loops with a clean API and agent-oriented docs.
#12
6.7/10SendGrid
API-firstTwilio SendGrid
High-volume transactional and marketing email infrastructure with a mature, battle-tested API.