Inkwell-MCP – An MCP server for newsletter creators (open source)
AI-powered newsletter toolkit, but core features exist in Notion + ChatGPT already.

Free unlimited subscribers sounds great, but built on Lovable means it's just a wrapper.
Newsletter writers and content creators
Substack · Beehiiv · ConvertKit
AI-powered newsletter toolkit, but core features exist in Notion + ChatGPT already.
$20 unlimited emails undercuts SendGrid, but the agent API is just documentation.
Clean typography and a block-based editor that explicitly supports code blocks and rendered math give Pluma immediate appeal for technical posts. It bundles useful extras — subdomains, a discover feed, newsletter and markdown export — so you can publish and distribute without stitching services together. Still, the product lives in a crowded field (Ghost, Hashnode, Substack) and I didn't see a single standout feature that demands switching over yet; try the demo to judge the editor's "snappiness."
Unlimited tokens per request, but request-based pricing still competes with Together, Baseten, and cheaper token models.
Substack-to-course importer for text-first creators, but Teachable and ConvertKit already own this space.
$9/year multi-page builder when Carrd charges $29 for one page.