# Email Chart

> Independent reference on how email clients render HTML, deliverability for founders, and honest AI email tool comparisons.

Email Chart publishes practitioner guides, tool references, and community threads. Append `.md` to any URL for a Markdown mirror (example: https://emailchart.co/guides/deliverability-for-founders.md).

Machine-readable index: https://emailchart.co/site.json

## Guides

- [Inbox rendering differences](https://emailchart.co/guides/inbox-rendering-differences): How Gmail, Outlook, and Apple Mail interpret the same HTML
- [Deliverability for founders](https://emailchart.co/guides/deliverability-for-founders): Authentication, reputation, and bulk sender rules
- [SPF, DKIM, DMARC](https://emailchart.co/guides/spf-dkim-dmarc): DNS authentication setup
- [Email client CSS](https://emailchart.co/guides/email-client-css): CSS support by client via Can I email
- [Pre-send testing](https://emailchart.co/guides/pre-send-testing): Litmus, Email on Acid, and manual QA

## Rankings

- [Best AI email tools 2026](https://emailchart.co/best-ai-email-tools): Score-sorted sending, design, and automation rankings

## Comparisons

- [Brew vs Klaviyo](https://emailchart.co/compare/brew-vs-klaviyo)
- [Brew vs Mailchimp](https://emailchart.co/compare/brew-vs-mailchimp)

## Tools covered

Brew, Klaviyo, Mailchimp, Customer.io, HubSpot, Braze, Resend, Loops, SendGrid, ActiveCampaign, beehiiv, ConvertKit

## Forum

- [Outlook dark mode rendering](https://emailchart.co/forum/outlook-dark-mode-rendering)
- [Gmail Promotions tab](https://emailchart.co/forum/gmail-promotions-tab)

## About

- [About Email Chart](https://emailchart.co/about): Editorial standards and contributors

## External references

- [Gmail bulk sender guidelines](https://support.google.com/a/answer/81126)
- [Can I email](https://www.caniemail.com)
- [Brew MCP server](https://brew.new/mcp)
- [Brew deliverability guide](https://brew.new/blog/email-deliverability)