Gridbench: Recall & Reflex

Gridbench is a benchmark, not a game. You take a test, you get a number, and you find out where that number sits among everyone else's. SIX TESTS Visual Memory — how many positions you can hold at once, from a single flash. Overdrive — the same task against the clock, ranked by how fast you clear ten levels. Reaction Time — simple reaction speed. Median of five, false starts caught. Precision — how close your recall lands when there is no grid to snap to. Filter — whether you can stop a hand that has already started moving. Scan — memory on top of deciding what is relevant in the first place. DAILY CHALLENGE One board a day, identical for every player. The first attempt is the one that counts. The grid you share afterwards shows the path you took through it, not just the total — which is what makes two results comparable at all. CHALLENGE A FRIEND A challenge link carries the exact board you played: same positions, same timing, same order. No curve, no averages — whoever does better does better. RESULTS YOU CAN CHECK Every run that enters a leaderboard is replayed on the server using the same code your phone ran. A result that cannot be reproduced does not get in. Board themes change colour and never difficulty. The contrast between the stimulus and the background is held equal across all of them, and a test enforces it — so no theme can make the test easier. WHAT IT IS NOT Gridbench measures performance on visual and motor tasks. It is not a medical device and not a diagnostic tool. It does not train your brain, improve your memory, or tell you anything about your health. It is a ruler, not a treatment. No ads. No analytics SDK. No account, no email, no password. Everything you store is deletable from inside the app, in one step.