An Inside Look at Building an Email Client in 3 Months - Ep. 44 with Kieran Klaassen, Brandon Gell

Building an email client used to take many years and millions of dollars.

But Every’s Kieran Klaassen built Cora—a totally new way to manage your inbox with AI—in just 3 months. He even shipped the original MVP of the product in a single day—something that just wasn’t possible before the current state of generative AI. 

Now, there are almost 10,000 people on the waitlist for Cora, and we’re onboarding new users every single day. 

Every’s head of Studio Brandon Gell and I worked closely with Kieran as he built Cora, and to kick off my podcast, AI and I, in 2025, I invited both of them on the show to talk about it. We go behind the scenes, getting into how Kieran built the product with Cursor, o1, and o1 Pro, what we’re learning as we onboard new users every day, and the future of Cora and of Every as a multi-modal media company.

This is a must watch for anyone curious about our approach to building with AI at Every.

If you found this episode interesting, please like, subscribe, comment, and share! 

Want even more?

Sign up for Every to unlock our ultimate guide to prompting ChatGPT. It’s usually only for paying subscribers, but you can get it here for free.

To hear more from Dan Shipper:

Subscribe to Every: https://every.to/subscribe 

Follow him on X: https://twitter.com/danshipper 

Links to resources mentioned in the episode:

Sign up for the Cora waitlist: https://cora.computer/ 

Learn more about Cora: Introducing Cora: Manage Your Inbox With AI

Kieran Klaassen: @kieranklaassen

Brandon Gell: @bran_don_gell

What is AI & I?

Learn how the smartest people in the world are using AI to think, create, and relate. Each week I interview founders, filmmakers, writers, investors, and others about how they use AI tools like ChatGPT, Claude, and Midjourney in their work and in their lives. We screen-share through their historical chats and then experiment with AI live on the show. Join us to discover how AI is changing how we think about our world—and ourselves.

For more essays, interviews, and experiments at the forefront of AI: https://every.to/chain-of-thought?sort=newest.