Buttondown

Buttondown is built by indie developers for indie developers and creators. It's a deliberately minimal email platform that respects your privacy, offers flat-rate pricing, and gets out of your way. The platform supports Markdown, offers a powerful REST API, and integrates with Zapier and RSS feeds—making it perfect for developers who want to add email to their SaaS without complexity.\n\nUnlike Substack (which takes 10% of paid subscriptions), Buttondown charges a flat fee with no revenue cut. For solopreneurs and indie hackers, this means keeping 100% of subscription revenue. The free tier (100 subscribers) is genuinely unlimited—send as many emails as you want. The $9/month plan unlocks full features without surprise upgrades. Support is fast and human-centric, not bot-driven. Perfect for technical founders building newsletter-centric products.