MJML vs Parcel

MJML is a markup language for building responsive email layouts. Its engine converts MJML into email HTML made with nested tables and inline CSS, with responsive behavior for popular email clients, including Outlook. Reusable, extensible components provide a starting point, and users can create their own components. MJML is open source under the MIT license and free to use. Its online editor supports writing and rendering MJML, and its free REST API renders markup into responsive HTML. The command-line interface can compile files, watch for changes, and save generated HTML to a chosen file. Local installation is available through npm on macOS, Linux, and Windows; plugins are available for Visual Studio Code and Sublime Text, alongside a desktop app. API accounts receive an Application ID and two API keys, with public and secret keys intended for browser and back-end use. Includes are ignored by default, and enabled include paths are restricted to approved roots. Once the HTML is rendered, users must send it through an email service provider or directly from a shell. The mj-button component is not fully clickable because of email-client support.

Parcel is a web-based email coding platform for brands and agencies, with tools to code, preview, and collaborate on emails. Its code-first editor keeps HTML, text, and AMP versions in one file and provides email-specific autocomplete, formatting, and code checks. Browser previews update as code changes, with responsive sizing, image blocking, dark mode, and visual impairment simulation. The platform lists 89 inbox preview combinations; inbox previews are a pay-as-you-go add-on for Pro and Business. Teams can reuse code components, edit together in real time, organize work in workspaces, and share emails through teammate or public links. Checks cover accessibility, HTML problems, links, and images; Business adds SpamAssassin scanning. Parcel says it works with any ESP and supports importing and exporting email code, with named integrations including Customer.io, Mailchimp, Klaviyo, HubSpot, and Salesforce Marketing Cloud. Parcel Analytics reports engagement and audience details such as read time, geolocation, and email client breakdown, with filters for Apple Mail Privacy Protection and proxy effects. Community is free; Pro costs $29/user/mo and Business costs $56/user/mo. New signups and Community users can try Pro or Business for seven days.