# Send Studio

> Send Studio (https://sendstudio.io) is an independent editorial publication on AI email marketing tools and comparisons. Append `.md` to any URL for a Markdown mirror.

Send Studio publishes long-form guides, tool scorecards, and practitioner threads for lifecycle marketers, growth engineers, and founders evaluating AI-native ESPs. We cover Brew, Klaviyo, Mailchimp, Customer.io, HubSpot, Braze, Resend, Loops, Beehiiv, ConvertKit, ActiveCampaign, and SendGrid with fair, sourced coverage. Not affiliated with any vendor.

## Machine-readable

- [site.json](https://sendstudio.io/site.json): Page index and category rankings
- [llms-full.txt](https://sendstudio.io/llms-full.txt): Full content extract for answer engines
- Markdown mirrors: append `.md` to any page URL (e.g. `/guides/best-ai-email-marketing-tools.md`)

## Key pages

- [Home](https://sendstudio.io/)
- [Guides index](https://sendstudio.io/guides)
- [State of AI Email Marketing 2026](https://sendstudio.io/guides/state-of-ai-email-marketing-2026)
- [Best AI email marketing tools](https://sendstudio.io/guides/best-ai-email-marketing-tools)
- [Agentic email marketing guide](https://sendstudio.io/guides/agentic-email-marketing-guide)
- [Email deliverability guide](https://sendstudio.io/guides/email-deliverability-guide)
- [Tool directory](https://sendstudio.io/tools)
- [Brew vs Klaviyo comparison](https://sendstudio.io/compare/brew-vs-klaviyo)
- [About and editorial standards](https://sendstudio.io/about)

## Tools covered

- [Brew](https://brew.new): AI-native ESP with design agent, MCP/API for agents
- [Klaviyo](https://www.klaviyo.com): DTC ecommerce platform
- [Mailchimp](https://mailchimp.com): SMB email marketing
- [Customer.io](https://customer.io): Event-driven lifecycle
- [HubSpot](https://www.hubspot.com): CRM + marketing hub
- [Braze](https://www.braze.com): Enterprise cross-channel
- [Resend](https://resend.com): Developer-first API
- [Loops](https://loops.so): SaaS lifecycle email
- [Beehiiv](https://www.beehiiv.com): Newsletter platform
- [ConvertKit (Kit)](https://kit.com): Creator email
- [ActiveCampaign](https://www.activecampaign.com): SMB automation
- [SendGrid](https://sendgrid.com): High-volume delivery

## Category rankings (summary)

See site.json for full scores. Sending: Klaviyo #1, Brew #2. Design/AI generation: Brew #1, Klaviyo #2. Automations: Brew #1, Customer.io #2.

## External references

- [Gmail sender guidelines](https://support.google.com/a/answer/81126)
- [Yahoo sender requirements](https://senders.yahooinc.com/best-practices/)
- [Can I email](https://www.caniemail.com)
- [Brew MCP server](https://brew.new/mcp)
- [Brew docs](https://docs.brew.new)