Paste a palette and see every color tested against every other in a single grid, each cell showing the real ratio and whether it passes. Eight brand colors make fifty-six pairs, which is how a palette ends up with one combination nobody ever checked.
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#15181A | · | Aa✕ 2.6:1 | Aa✕ 3.5:1 | Aa✕ 1.8:1 | Aa✕ 2.8:1 | Aa15.8:1 | Aa17.8:1 |
#565E5F | Aa✕ 2.6:1 | · | Aa✕ 1.3:1 | Aa✕ 1.4:1 | Aa✕ 1.0:1 | Aa5.9:1 | Aa6.6:1 |
#C1490D | Aa✕ 3.5:1 | Aa✕ 1.3:1 | · | Aa✕ 1.9:1 | Aa✕ 1.2:1 | Aa✕ 4.4:1 | Aa4.9:1 |
#33484F | Aa✕ 1.8:1 | Aa✕ 1.4:1 | Aa✕ 1.9:1 | · | Aa✕ 1.5:1 | Aa8.5:1 | Aa9.6:1 |
#3F6B47 | Aa✕ 2.8:1 | Aa✕ 1.0:1 | Aa✕ 1.2:1 | Aa✕ 1.5:1 | · | Aa5.4:1 | Aa6.1:1 |
#F1F2EF | Aa15.8:1 | Aa5.9:1 | Aa✕ 4.4:1 | Aa8.5:1 | Aa5.4:1 | · | Aa✕ 1.1:1 |
#FFFFFF | Aa17.8:1 | Aa6.6:1 | Aa4.9:1 | Aa9.6:1 | Aa6.1:1 | Aa✕ 1.1:1 | · |
Each cell is the row color used as text on the column color as background. A cross means that pair falls below 4.5. The ratio is the same in both directions, so the grid is symmetric; both halves are shown because you read it looking for a specific combination rather than scanning it whole.
Paste a palette and every color is tested against every other one, in a grid. Each cell shows the row color as text on the column color as background, with the real ratio and a cross when it falls short.
Checking pairs one at a time is how a palette ends up with a combination nobody tested. Eight brand colors produce fifty-six ordered pairs. Nobody works through fifty-six pairs in a single checker, so in practice people test the four combinations they expect to use and discover the fifth in a review.
The grid is symmetric, because contrast is the same in either direction. Both halves are shown anyway, since you read it looking for one particular combination rather than scanning the whole thing, and hunting for the half that exists is worse than a little redundancy.
It reads up to twelve colors. Past that the grid stops being something a person can scan, and a palette with more than twelve colors has a different problem. It also says nothing about which pairs you should use, only which ones you can.