A daily perception practice
Percore is a two-minute daily practice that calibrates four senses — colour, pitch, duration and space. You memorise. You recreate. You find out exactly how close you were.
iPhoneAbout two minutesThe daily practice is free
Before you read any further
Two of the four exercises, straight from the app and shortened to three rounds each. Something is shown or played, it goes away, and you reproduce it. People are usually surprised — in both directions.
An interactive audio demo. A tone plays, then you match its pitch with a slider. The slider announces its frequency in hertz, and every result is given as text as well as sound.
Three tones, from memory.
A tone plays once. Then you find it again by dragging — the pitch follows your finger as you move.
Check your volume before you start.This plays a sine tone through your speakers or headphones. The control below is set to a moderate level — turn it down first if you are wearing headphones.
Sound only starts when you press the button — never on page load.
If you cannot use the audio, this demo cannot measure anything for you — and it will not pretend to. It is described in words on the senses page.
The four
Each one is its own short session in the app. The shape never changes: something is shown or played, it goes away, you reproduce it, and you see the difference between what was there and what you made.
A colour fills the screen, then disappears. You rebuild it with hue, saturation and brightness — and find out which of the three you were actually reading.
A single tone plays once. You find it again by dragging a waveform, and the pitch glides under your finger as you move.
Something breathes for a while and stops. You press and hold until it feels like the same length. No numbers, no clock — you only have the feeling of it.
A triangle sits somewhere on a grid, turned and sized. It vanishes. You move, rotate and scale it back to where it was.
The daily practice
Five rounds each. The same targets for everyone on the same day, so a session is comparable to yesterday's and to anyone else's.
A few seconds with the target and nothing else on screen. No controls yet — looking is the whole task.
The target is gone. You rebuild it with real controls: sliders, a waveform, a held press, a triangle you can drag.
Yours and the original, side by side, with the actual distance between them. This is the part that teaches.
Tomorrow the targets are new. Nothing expires, nothing is lost, and a missed day costs you nothing but the day.
What accumulates
Every session leaves a reading: your recent average for that sense, how it has moved, and a short written line about what changed. There is no single composite score on the home screen, because no one can feel a blended number — and a number nobody can feel is a number nobody should be asked to trust.
One plain sentence after each session, drawn from your own history. When there is nothing true to say yet, it says that instead of inventing something.
You are compared with your own recent weeks, never with a population. A slip is shown in a muted tone, never in red.
Leave a sense alone for a while and Percore lowers its confidence in the reading — it never lowers the reading itself. You did not get worse because you were busy.
Who it is for
Designers arguing about two greys. Photographers who can see a quarter-stop. Musicians who hear the room. Architects, editors, colourists, anyone whose work rests on a judgement they cannot quite explain.
None of that is a requirement. The exercises are four simple tasks with honest scoring, and they work exactly the same for someone who has never thought about any of this — which is most people, most of the time.
You can't practise a sense you never measure.
Free and Pro
Everything the daily ritual needs — the four sessions, your scores, your streak, your per-sense averages, the radar and the daily reading — is free and stays free. Pro is for people who want to work at it.
Free
$0Free, and not a trial
The whole daily practice, and everything needed to believe it: your scores, your streak, and your own progress over time.
Percore ProPro
$39.99a year
or $9.99 a week
For working at a sense outside the ritual, and for seeing the longer arc.
Percore Pro is an auto-renewing subscription billed through your Apple ID. You can cancel any time in the App Store; cancelling stops the next renewal and you keep Pro until the period ends.
Same senses. Same day. See what you notice.
Two minutes tomorrow morning, and again the morning after. Within a week you will know whether this is a thing you want. That is the whole pitch.
Join the waitlistPlainly
A daily practice with four short exercises. Each one shows or plays something, takes it away, and asks you to reproduce it. You get an accuracy score for each round and a reading that describes how your recent sessions have moved. That is the entire product.
No, and we are careful about this. Percore makes no claim about intelligence, memory, focus, or any benefit that carries over to work or life. It does not diagnose, treat or assess anything medical. What it measures is narrow and literal: how close your reproduction was to the target you were just given. We show you that, over time. We do not tell you what it means about you.
No. The daily practice is free, along with your session scores, streak, per-sense averages, the radar, and the daily reading. Percore Pro adds unlimited practice outside the daily ritual, the weekly reading, week-over-week comparison, and longer history.
A single sense is five rounds — roughly half a minute. All four is about two minutes. It is designed to be finished, not to be lingered in.
It is written for them, because they are the people who already care about this and already argue about it. But nothing in the exercises assumes any training. They are four ordinary tasks scored honestly.
Some exercises will be harder or will not be meaningful for you, and Percore should say so rather than score you badly and stay quiet about why. The other senses are unaffected — timing and spatial accuracy do not depend on either. In the app every exercise is operable with VoiceOver and respects Reduce Motion and Dynamic Type.
Only relative to you. A 78 on colour is not a rank, a percentile, or a statement about anyone else. It is one measurement in your own series, and the series is the point.
The practice runs on your device. We do not sell data, and we do not build advertising profiles. What we collect and why is written out in full on the privacy page, in the same plain language as everything else.