Munin
Munin turns your phone time into lasting general knowledge: short lessons in history, science, philosophy and mythology, then spaced repetition quizzes that bring each fact back right before you would forget it.
Free, no ads. Unlimited is optional if you get hooked.
Most learning apps let you read and forget. Munin is a microlearning app built around spaced repetition, the memory technique used by medical students and language learners.
Every lesson takes a few minutes and ends with a short quiz. The same quick hit as a feed, except every topic is hand-curated and fact-checked, written for adults who want depth.
Every question you answer joins your personal review queue. Get it right and it comes back later. Get it wrong and it comes back sooner. Sessions are sized to what is actually due, so catching up never feels like homework.
Every topic you study becomes a tile on a growing hex map. Streaks, XP and ranks turn showing up daily into a habit, and mastered topics go on your trophy shelf.
Recognising the right option in a list is easy. Recalling it is what makes it stick. Munin asks you to type selected answers, and questions you already know well switch to typed recall in review. Small typos are forgiven and the official spelling is shown.
Pick the topics you care about and Munin builds your daily plan around them. From ancient empires to the gut microbiome, every topic is written for curious adults: no fluff, no filler. A peek at the shelf:
The Roman Empire
How to Read a Painting
The Mongol Empire
The Solar System
Ancient Egypt
Cognitive Biases
The Ocean
World War II
Game Theory
Stoic Philosophy
Nutrition
The Silk Road
Japanese Mythology
Electricity
In Norse mythology, Odin keeps two ravens: Huginn, thought, and Muninn, memory. Every morning Muninn flies out over the world and returns with what he has learned.
That is what this app does for you: it sends your curiosity out during the day and makes sure what it brings back is still there tomorrow.
Start now, it's free. No ads, ever.