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Cobalt turns non-fiction bestsellers into 5-15 minute summaries you can tailor to your goal: Actionable, Scientific, or Key Takeaways. 300+ titles, offline mode, in 5 languages. Learn from the best books without the 300-page commitment.
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
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About Cobalt - Book Summaries on Product Hunt
“Skip the pages, keep the ideas ! ”
Cobalt - Book Summaries was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #153 on the daily leaderboard. Cobalt turns non-fiction bestsellers into 5-15 minute summaries you can tailor to your goal: Actionable, Scientific, or Key Takeaways. 300+ titles, offline mode, in 5 languages. Learn from the best books without the 300-page commitment.
Cobalt - Book Summaries was featured in Android (57.5k followers), Productivity (658.7k followers), Artificial Intelligence (476.4k followers) and Books (122.6k followers) on Product Hunt. Together, these topics include over 326.8k products, making this a competitive space to launch in.
Who hunted Cobalt - Book Summaries?
Cobalt - Book Summaries was hunted by Théo Rousseau. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Théo Rousseau