Don't lose
your target.
Core Tracker is an attention arena built on Multiple Object Tracking research. Pick your targets, watch the field scatter, and hold your lock until time runs out.
How a session works
01 — 04Targets light up
A handful of balls flash at the start of the round — these are the ones you have to keep eyes on.
The field scrambles
Every ball — targets and distractors alike — moves at once, crossing paths and bouncing through the arena.
You hold the lock
No highlights, no hints. Your prefrontal cortex does the work of keeping each target's identity straight.
Call your targets
When the timer ends, select the balls you tracked. Right calls build your streak; misses reset it.
Tune the difficulty
PARAMETERS1× – 10×
Scale how fast every object moves, from a calm warm-up pace to a near-unreadable scramble.
Set the field size
Add more balls to the arena to raise the visual noise your targets have to survive in.
Choose how many to track
Track a single ball to start, or push toward tracking several targets in parallel.
5s – 60s
Set a session length that fits a quick break or a longer, sustained-focus drill.
Elastic collisions
Toggle real collision physics on for unpredictable deflections, or off for steadier, more linear paths.
Nothing else on screen
No ads, no banners, no pop-ups. The arena is the only thing competing for your attention.
Built to run local
NO ACCOUNT REQUIREDNo personal data
Core Tracker doesn't ask for a name, an email, or anything else to start playing.
No gameplay logging
Sessions, scores, and settings stay on your device. Nothing is sent anywhere to track you.
No ad or analytics SDKs
The app doesn't connect to advertising or analytics services of any kind.