Learn what school skipped. Remember it for life.
Five-minute quizzes on philosophy, money, history, science and more. Spaced repetition brings each card back right before you forget it.
7-day free trial. iPhone.
Try it now. These are real cards from the app.
Five minutes a day
A short daily session of quiz cards. Answer, read why, move on. The app plans what you see next.
It comes back before you forget
Cards you miss return sooner. Cards you know wait longer. The schedule is built on FSRS spaced repetition.
The full story, with sources
322 deep dives explain the why behind the cards. Every card and article names its source.
Nine paths. 2,996 cards.
Study three paths at a time. Swap one each month as your interests change.
- Become an Adult311 cards · 32 deep dives
- Philosophy393 cards · 36 deep dives
- World History356 cards · 38 deep dives
- Taxes & Money340 cards · 37 deep dives
- Science & Nature358 cards · 47 deep dives
- Health & Wellness380 cards · 40 deep dives
- Psychology & Mind289 cards · 26 deep dives
- Art & Culture285 cards · 34 deep dives
- Technology & AI284 cards · 32 deep dives
What's new
Version 1.6.5
Sent to Apple for review on October 15, 2026.
- Opens faster. The first screen appears without a pause.
- Answering a card and moving to the next one is instant, with no stutter.
- Built for iPhone Duo's inner display: Home shows your session and your stats side by side, and Paths and Deep Dives use a two-column grid.
- Articles, quizzes and your profile keep a comfortable reading column on wide screens.
Start with a free week
One subscription covers every path, every deep dive and the full review schedule.
Yearly
$99.99
per year. That is $8.33 a month.
Monthly
$12.99
per month.
7-day free trial for new subscribers. US prices. Cancel any time in your App Store subscriptions, at least 24 hours before the trial ends, and you pay nothing.