Buttondown is an email newsletter service built for independent writers, journalists, and small publishers. It deliberately avoids heavy drag-and-drop builders in favour of a simple, fast writing experience.

Markdown writing: compose newsletters in Markdown instead of a visual editor.
Subscriber management: organise readers with tags and segments, handle imports and exports, and enable double opt-in.
Public archive: every issue gets a web version that can be published on your own domain.
Automation: set up welcome sequences and schedule sends or drip campaigns in advance.
Integrations: an HTTP API, Zapier support, and RSS-to-email for turning a feed into a newsletter.
Paid subscriptions: connect Stripe to charge readers for access.
Analytics: track opens, clicks, and subscriber growth.

The product is a hosted web application, so there is nothing to install and it works from any modern browser. Pricing is tiered by subscriber count rather than by emails sent, which makes costs predictable as a list grows, and a free tier is available for small lists. It suits people who want a straightforward, low-distraction tool for sending a regular newsletter without the complexity of a full marketing platform.