Enchiridion turns the world's best knowledge — philosophy, science, money, history, health — into a daily 5-minute habit. The FSRS algorithm schedules the exact moment to review, so what you learn actually sticks.
Good morning
Welcome back
Today
34 / 50 XP
⚔️ Daily Quests
2 of 3Continue learning
Philosophy · Stoicism
12 cards due
In Camus' The Myth of Sisyphus, what is the fundamental philosophical question?
Deep Dive
🔖Marcus Aurelius was the most powerful person on Earth when he wrote what would become one of the most influential personal journals in history. The Meditations weren't written for publication — they were private notes from a man trying to apply Stoicism to the daily grind of running an empire...
Two millennia later, his practical framework — the dichotomy of control, negative visualization, the view from above — is being rediscovered by therapists, athletes, and anyone looking for an operating system for a difficult world.
🔑 Key ideas
Cited: Stanford Encyclopedia of Philosophy, A.A. Long (2002), and 11 more sources
Not another flashcard app. A whole knowledge habit, engineered to stick.
Powered by the real FSRS-5 algorithm — the gold standard for long-term retention. Reviews are scheduled the moment before you'd forget, so knowledge sticks for life.
Multiple choice, true/false, fill-in-the-blank, matching, sequencing, and speed rounds. Your brain stays engaged because the format actually changes.
Go beyond the quiz. Every topic has a beautifully typeset article with 10-15 real sources — Stanford Encyclopedia, NIH, IRS, peer-reviewed journals.
7 difficulty levels. The app stays in the 85–90% correct band per-path — challenging enough to grow, easy enough to stay motivated.
Daily quests, XP milestones, achievements, gems to shield your streak. Learning becomes the good kind of addictive.
Progress syncs across iPhone and iPad via CloudKit. Home Screen and Lock Screen widgets keep your streak one tap away.
Learning sticks when your brain has to work in different ways. Click any format to see it in action.
Every path ships with hundreds of quiz cards, dozens of deep dives, and enough depth to last you years.
Everything they should have taught you in school
2,500 years of humanity's best thinking
Understand how we got here
Financial literacy that actually matters
Build scientific intuition
Your body is the only place you have to live
Understand yourself and others
See the world through creative eyes
Understand the systems shaping the future
We cite Stanford Encyclopedia of Philosophy, NIH, IRS publications, CDC, the Cambridge Companion series, peer-reviewed journals, and primary texts. No “10 weird facts” listicles. No AI hallucinations. Every card audited.
What happens to knowledge with and without spaced repetition, based on Ebbinghaus' forgetting curve and FSRS research.
85%
Long-term retention
with FSRS-5 spaced repetition after 90 days
4×
Less study time
vs. re-reading or cramming, for the same recall
5 min
Per day is enough
to build durable knowledge across all 9 paths
Curves illustrative of findings from Ebbinghaus (1885), Cepeda et al. (2006), and modern FSRS research by Jarrett Ye and contributors.
Every topic has a long-form companion article. Typeset like a book, sourced like a journal, actually fun to read.
Marcus Aurelius was the most powerful person on Earth when he wrote what would become one of the most influential personal journals in history. The Meditations weren't written for publication — they were private notes from a man trying to apply Stoicism to the daily grind of running an empire...
🔑 Key ideas from this dive
Linked cards
12 quiz cards reinforce this dive
Every deep dive article is 12–16 sections, 2,000–4,000 characters each, with 10–15 real sources. Written like a great magazine piece — no filler, no fluff, no SEO word-salad.
344
Articles
12
Avg. sources
11 min
Avg. read
2,828
Tied to cards
Streaks, XP, quests, achievements — the same loops that make games addictive, put to work on things that actually matter.
Scholar · Level 12
14,320 XP
720 / 1000 to Level 13
🔥
42
streak
💎
238
gems
🏆
19
badges
Achievement unlocked
Stoic Scholar
+100 XP
⚔️ Daily Quests
2 / 3Three new quests each day. Complete them to earn XP and gems.
Review 20 cards • Learn a new topic • Maintain your streak
Shield your streak with gems so one bad day does not reset your progress.
🔥 42 day streak protected
Level up your character, unlock new paths, and track lifetime knowledge gained.
Level 12 • 14,320 XP earned
Dozens of unlockable badges for specific learning milestones and consistency.
Stoic Scholar • Polymath • Streak Guardian
Four steps. About five minutes a day. The algorithm does the rest.
Choose the subjects that matter to you. Philosophy? Taxes? Science? You are not stuck on one curriculum.
7 difficulty levels mean questions adapt to you. No frustration, no boredom — just the right challenge.
The algorithm shows you a card right before you would have forgotten it. That is why it works.
Every day you practice, you get smarter. Streaks, XP, and quests keep you coming back without thinking.
Enchiridion is out now on iPhone and iPad. Free to start, with the FSRS-5 algorithm scheduling every review for you. Open the App Store and the first card is one tap away.
Free to download · iPhone & iPad · iOS 17+
Enchiridion
Learn for Life
9
paths
2.8k
cards
344
dives