A new edition every morning

Five cards a day.
A little sharper.

Every morning, five cards: facts worth keeping and questions that test your judgment. Answer, say how sure you are, and watch your confidence get honest.

Download on the App Store Get it on Google Play
  • 5cards a day
  • 2minutes
  • 19subjects
  • 13languages
Astute's Today screen on iPhone: a blue Space card asking 'What actually limits how far a probe can go?', with 'Tap to reveal' at the bottom The same card turned over: the answer about plutonium-238, a line to repeat tonight, and the source

How a day works

Five cards a day, two minutes.

A new edition every morning. This is the shape of one.

Every morning

The question of the day

Everyone gets the same one.

Your mix

Four more, chosen for you

Your subjects, your level, never one you've read.

Your call

Say how sure you are

It matters more than being right.

The reveal

Flip it

The answer, one line to repeat tonight, and the source.

The Space card flipped: the answer about plutonium-238, the bar move 'The edge of the solar system is a supply-chain problem', and the source

The streak

Come back tomorrow

A streak, with freezes for the evening you forget.

Day done: 'Day 1 · five read' above today's five, with a violet Psychology card asking 'Should schools sort pupils into classes by ability?'

Calibration

Say how sure you are.

Astute doesn't reward being right. It rewards knowing how likely you are to be right.

Every answer carries a number: 50, 60, 70, 80 or 90 per cent sure. Over the weeks, Astute plots how often you were right at each. Drag to read a typical first month.

How sure are you?

You said 70%.

You were right 63% of the time. 7 points overconfident.

How often you were right 40% 60% 80% 100% Perfectly calibrated 63% 50% 60% 70% 80% 90% How sure you said you were

Principles, not trivia

What you got wrong comes back — somewhere new.

One card teaches a card. A principle teaches everything it touches.

Miss the base rate in a clinic and, weeks later, it comes back in a crowd. Tap a card to flip it.

One principle Base rates

Medicine

A test for a rare disease is 99% accurate. You test positive. How likely is it that you're ill?

Tap to flip

Medicine

A test for a rare disease is 99% accurate. You test positive. How likely is it that you're ill?

About 9%. If one person in a thousand has the disease, the test finds them — and flags about ten healthy people alongside. Most positives are false ones.

Bar move

Before you trust a positive, ask how rare the thing is.

Technology

Face recognition is 99% accurate. It flags a face in a crowd of 100,000. How likely is it that they're on the watchlist?

Tap to flip

Technology

Face recognition is 99% accurate. It flags a face in a crowd of 100,000. How likely is it that they're on the watchlist?

About 1%. If ten people in that crowd are on the list, the system finds them — and a thousand who aren't. Same maths, different world.

Bar move

Ninety-nine per cent accurate can still be wrong almost every time.

Subjects

Nineteen subjects.

Every card, chosen for you.

Inside

The whole app, in five screens.

Today’s five, the answer behind each card, the day done, a shelf to explore, and your record.

Widgets

On your home screen.

Today's card on your home screen. Your streak on your lock screen. Today's five, and how far you are.

  • Today's cardThe question of the day, before you open the app.
  • Your streakA number on the home screen, a ring on the lock screen.
  • Today's fiveHow far through the day you are, at a glance.
Astute home screen widgets: today's Space card with a 12-day streak, a day-streak counter reading 12, an Economics card marked done for today, and Today's five showing 2 of 5 read
Astute lock screen widget: '12 days · Astute', today's Space card and a ring showing 12

The science

What the evidence says.

  1. You can't train general intelligence.

    Simons et al., 2016
  2. You can train away specific biases, and it transfers.

    Morewedge et al., 2015Sellier, Scopelliti & Morewedge, 2019
  3. You can train calibration.

    Mellers et al., Good Judgment Project — about 10% better forecasts

So Astute doesn't promise a bigger brain. It trains the three things that move.

Friends

Compare how honest you are, not how much you read.

Add friends with a code. The board sorts by calibration, so the person who knows what they know sits on top, whatever their streak.

Your friend codeASTU-7HD3
NameStreakWeeksCalibration
1LLéa3114+1
2YYou126−3
3TTomás42−9

Calibration is the gap between how sure you said you were and how often you were right, in points. Closer to zero is better. An example board.

Pricing

Make all five yours.

Astute is free every morning. Astute+ chooses every card for you.

Free

€0every morning

  • The question of the day
  • The edition's cards
  • One card of your own each day
  • A week of archive
Download free

Astute+7 days free

  • All five cards chosen for you
  • Your journey, subject by subject
  • Your whole archive
Try 7 days free, then €29.99/yr

Cancel any time, in the App Store or Google Play

Prices in euros; the App Store and Google Play show yours.

FAQ

Questions.

Yes. Every morning you get the question of the day, the edition’s cards and one card of your own, with a week of archive. Astute+ makes all five cards yours.

Astute+ yearly starts with seven days free. Nothing is charged until the eighth day. Cancel before then and you pay nothing: on iPhone in Settings → Apple Account → Subscriptions, on Android in Google Play → Payments & subscriptions → Subscriptions. Cancel later and you keep Astute+ until the period ends.

Thirteen: English, Italian, German, French, Spanish, Portuguese, Polish, Dutch, Turkish, Japanese, Korean, Chinese and Russian. Astute follows your phone’s language.

No. Astute starts anonymous. Sign in with Apple or Google when you want to keep your record on a new phone.

No ads, nothing sold. The details are in our privacy policy.

In the app: Profile → Delete account.

Yes. Astute is on Google Play and the App Store, with the same cards every morning.

Still have a question?Write to thebalecompany@gmail.com. We answer within two working days.

Support

Two minutes.
Every morning.

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