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Rating summary
About
Three guesses a day. Then the tape.
How many dots were there? What's the angle? How full is the shape? Trust your eye, pull the tape to your answer, and lock it in. The true value drops onto the same tape in red, and the gap between you and the truth is right there to see.
THREE ROUNDS, ABOUT A MINUTE
- Dots: a field of dots for three seconds, then they're gone. How many were there?
- Angle: two lines meet at a point. How wide is the angle?
- Fill: a square, circle or triangle filled from the bottom. How much of its area is full? Circles and triangles are trickier than they look.
Every round scores out of 100, and your daily score is the average. 97 or more is bang on.
THE SAME SET FOR EVERYONE
A new set unlocks at midnight. Everyone gets the same three rounds on the same day, so you can compare notes. Share your result as a card that shows how far off you were without giving the answers away.
LEARN HOW YOUR EYE IS BIASED
Calibration looks at your last 30 days and tells you plainly how you lean: "You undercount by 7% on average." "You see angles 4° wider than they are." Each day is a dot on a strip, with a line at your average.
ALSO
- Streaks, your average score and this week's scores at a glance
- Home screen and lock screen widgets
- An optional daily reminder, only on days you haven't played
- Dark mode, Dynamic Type and VoiceOver: the tape can be set with the plus and minus buttons or adjusted with VoiceOver
PRIVATE BY DESIGN
No account, no ads, no tracking. Everything is computed on your iPhone, and nothing you do leaves it.
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What's New in Estim8
1.0
October 30, 2026





