The feed
Scroll something worth knowing
Short, quality-checked cards you actually finish.
One idea per cardSource-backed20-second reads
curio — short rabbit holes worth finishing
Short rabbit holes worth finishing.
Download on theApp StoreCurio AI
Ask it to go deeper
Curio AI opens up any card the moment you wonder.
Explain deeperMake it simplerQuiz me
Topic feeds
Type a topic. Get a feed.
Anything you are curious about, built in seconds.
Any subjectBuilt in secondsYours to keep
Scenario mode
Stories that change with you
Your call decides what happens next.
You decideBranching outcomes3-minute stories
Discover
Twelve worlds to fall into
Horror at 1am, history at lunch, science on the train.
Twelve worldsHorror to historyOne tap away
Community
Stories from other readers
Reader-submitted, and reviewed before they publish.
Reader-submittedReviewedFresh every week
Offline
Take it underground
Download a category and read with no signal at all.
Any categoryNo connectionRefreshes daily
What Curio is
Curio is a full-screen reading app that turns scrolling into learning. Instead of an endless feed of noise, you swipe through short, quality-checked reads you actually finish — one idea per card, about half a minute each.
Tap any card and Curio AI opens it up: explain it deeper, make it simpler, or quiz yourself on it. Type any subject and Curio builds you a feed on it in seconds. Scenario Mode turns a topic into a branching story where your choices decide what happens next.
The essentials
- Platform
- iOS, free on the App Store. No account needed to read.
- Reading
- 17 categories — psychology, history, science, mystery, books, career, money, horror-lite and weird knowledge.
- Offline
- Download a category and read it with no connection at all.
- Curio Pro
- Optional subscription: unlimited reading, every category, and the full Curio AI toolkit.
- Languages
- English, 中文, Español and Português.
- Made by
- Leon Kelvin Li, founder of Curio. He designed, built and shipped the whole product solo — the iOS app, the API and the content pipeline — from first commit in June 2026 to App Store launch on 22 July 2026.
How it works and the full FAQ · Every feature · About Curio · Leon Kelvin Li, the founder
Or watch the whole thing
The same seven acts as one 57-second film. Every screen is the shipping iOS app, recorded against the live API.
The Curio blog
Curiosity is easy. Memory is rare.
Short posts on attention, memory and why some things stick — free to read here, no app needed. Every post names its sources, and every citation is checked against CrossRef before it publishes.
Culture
When an AI decides about you, there is a side door
Every system that scores people creates two ways to pass: make the work better, or learn what the judge likes. The second one is the side door.
CultureOur narrator sounded like a list. The script had 22 sentences.
One recording sounded like items being read out. Twenty-two short sentences became six longer ones and the sound went away — but we changed the pauses at the same time.
CultureShipping got easier. Polish may be the advantage now.
Launching stopped being the hard part. I keep noticing software that feels unfinished, and polishing never got easier. Here is why, from two things I built.