Features

Everything you need in a conversational newsletter

From personalized digests to open-source extensibility — built for the way you actually consume information.

Generative UI

Your daily tech digest, styled your way

Every morning, Claude generates a styled interactive HTML digest tailored to your subscriptions. It's not a template — it's freshly generated each time based on your preferences and the latest content.

  • ◇Customize with natural language: "use colorblind-safe colors", "add emoji headers"
  • ◇5 built-in theme presets — or describe your own
  • ◇Rendered as a rich artifact right in Claude
Browse themes →
Lattice Digest April 12, 2026
Rust

Async closures hit stable in Rust 1.94

Eliminating a major pain point for async code.

AI

Claude 4.5 Opus released with 1M context

The most capable model yet, now generally available.

MCP App

Browse, search, and explore — right inside Claude

The MCP App UI renders an interactive dashboard directly alongside your conversation. Filter by topic, expand articles, track what you've read — all without leaving Claude Desktop.

  • ◇Topic filtering and full-text search
  • ◇Expand items inline to read full content
  • ◇Read/unread tracking across sessions
ferrisletter panel
All Rust AI MCP

New MCP transport spec draft

modelcontextprotocol.io · 3 min

Tokio 2.0 roadmap published

tokio.rs · 5 min

Scheduler

Set it and forget it

Configure delivery with a single sentence. Claude calls the tools on your schedule — loading your preferences, fetching your feed, generating the digest, and marking items as read. You just open Claude and it's there.

  • ◇Daily, weekday, or weekly frequency
  • ◇Pick your preferred delivery time
  • ◇Fully automated — no manual triggers needed
▸ "Set up daily delivery at 9am on weekdays"
◇ Scheduled: weekdays at 9:00 AM. I'll load your preferences, fetch your unread feed, generate a styled digest, and mark everything as read.
Personalization

Your newsletter, your rules

No settings page, no checkboxes. Just tell Claude what you want. Subscribe to topics, adjust your display, change your theme — all through natural conversation.

  • ◇Pick topics and tags conversationally
  • ◇Custom display instructions (emoji headers, grouping, font size)
  • ◇Read tracking — never see the same item twice
▸ "Subscribe me to Rust and AI topics"
◇ Done! You're now subscribed to Rust and AI. You have 12 unread items.
▸ "Use a colorblind-safe theme with emoji headers"
◇ Updated! Your next digest will use the Daltonian theme with emoji section headers.
Open Source

Built on an open platform

Ferrisletter is an open-source MCP newsletter SDK. The connector system is pluggable — anyone can build a connector to bring in content from any source. Published on crates.io, MIT licensed.

  • ◇Pluggable connector system (RSS, static, custom)
  • ◇Built with Rust for performance and reliability
  • ◇MCP-native — works with any MCP client
GitHub → Build a connector →
◇ ferrisletter-connector 
pub trait Connector: Send + Sync {
    async fn fetch_items(&self)
        -> Result<Vec<Item>>;
    fn source_name(&self) -> &str;
}