Five true facts a day. Never a repeat.
Swipe today's five cards and tap one to see why it's true and where it comes from — NASA, Britannica, the Smithsonian and more. No myths, no quiz.
Get it on Google Play
A short why on every card
Tap a card to flip it: two or three plain sentences explaining why the fact is true, plus the source it's based on.
Never the same fact twice
Curiodex remembers what you've read on your phone, so your daily deck is always new to you.
12 topics to collect
Space, animals, the human body, history, science, Earth and nature, food, words, the ocean, inventions, art and music, places.
Save, search, find it again
Save favorites, search every fact by word and see everything you've read by date — none of it behind a paywall.
A widget with a Next button
A new unseen fact on your home screen. Tap Next for another without opening the app.
Family safe
No adult content, no gossip and no health myths. Facts you can share at the dinner table, as an image or text.
Report anything that looks wrong
Every card has a Report button. Reports are checked and facts are fixed in updates.
Offline, no account
All facts live on your phone. Choose your topics, change the text size, light or dark theme.
FAQ
- Are the facts really true?
- Every fact is written from mainstream references such as NASA, Britannica, the Smithsonian or National Geographic, and each card names its source. Popular myths are left out on purpose.
- Will I see the same fact again?
- Not until you've read all of them. Curiodex keeps a list of what you've seen on your phone and picks only new facts for your daily five and the widget.
- How many facts are there?
- 360 facts across 12 topics at launch, with more added in updates.
- Is it a quiz?
- No. Curiodex just states the fact plainly. Tap the card if you want the explanation.
- Can I find a fact I saw last week?
- Yes. The Dex tab has Saved and Seen lists, and you can search every fact by word.
- Is it suitable for kids?
- The content is family safe, with no adult topics. The app itself is made for teens and adults.
- Does it need internet or an account?
- No account. Facts are stored in the app, so it works offline. Ads load when you're online.
Guides
Curiodex is free and supported by ads. Facts are general knowledge for curiosity, not medical, legal or financial advice. Source names refer to the organizations each fact is based on; they are not affiliated with the app.