Wes and Scott talk with Loïc Houssier about how Superhuman builds lightning-fast, delightfully-designed email software. They dig into engineering philosophy, offline-first architecture, local databases, AI-powered productivity, and what it takes to create tools that people love.

Show Notes

  • 00:00 Welcome to Syntax!
  • 03:05 Inside Superhuman and Loïc’s role
  • 06:49 Is Superhuman native? What’s the tech stack?
  • 08:16 How Superhuman approaches product design and speed
  • 12:17 Local-first architecture – Sync, storage, and performance



  • 13:46 Vector search, AI, and privacy considerations


  • 18:12 How the team ships fast and stays focused


  • 21:27 Rethinking email for the future


  • 26:54 Brought to you by Sentry.io


  • 27:19 How calendar integration and smart features work


  • 29:54 Where new ideas come from


  • 31:54 Will there ever be a true dark mode?


  • 33:02 Are people actually using keyboard shortcuts?


  • 36:42 How shortcuts work and the role of the command palette


  • 41:28 Engineering for speed – Costs and trade-offs


  • 43:32 How Superhuman’s sync engine works


  • 46:09 What code runs locally and what runs on the server?


  • 46:51 How Superhuman handled the Google and Cloudflare outage

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