Hey everyone 👋, I’m Théo, the solo founder behind Cobalt. This one comes from a frustration I’ve had for years : I love personal development books, I genuinely think they teach some of the most essential things you can learn. But let’s be honest: they’re long. And when you’re a student or working full-time, finding those hours is hard. Worse, it’s so easy to fall into passive reading: highlighting, nodding along, and forgetting everything a week (or minutes)later, while these books are literally about taking action. So I built Cobalt to fix exactly that! Under the hood, it runs a custom LLM specialized in summarizing books, made by myself: it doesn’t just shorten them, it extracts the actionable concepts, the things you can actually apply to your life. You can even pick the angle you want: actionable steps, the science behind it, or just the key takeaways. And it all lives in a scrollable, minimalist interface designed to “trick” your brain: the same effortless scroll that keeps you on social media, except this time you come out smarter. Zero friction, ultra-intuitive. Cobalt is a mobile app, available on iOS and Android. There are 300 books right now (and I keep adding more), it’s native in 5 languages (EN, FR, ES, DE, IT), and it works offline. I’d genuinely love your honest feedback: what’s missing for Cobalt to become part of your daily routine? That’s exactly what I’m trying to figure out. I’m here all day to answer 🙌 Thank you in advance for your help :) Have a nice day Théo

Cobalt - Book Summaries

Skip the pages, keep the ideas !

Skip the pages, keep the ideas !