#637366
Closest named color: Dim Gray (#696969). oklch(53.8% 0.028 150.8), rgb(99, 115, 102).
Aa
White text reads best on this color (5.03:1).
About this color
#637366 is a medium-dark close to neutral grey. In OKLCH its lightness is 54%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Dim Gray (#696969), ΔE 0.033 away. White text reads best on it, at 5.03:1.
| Hue family | Neutrals |
| Lightness | medium-dark (54%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Dim Gray (#696969) |
| Black text | 4.17:1 |
| White text | 5.03:1 |
Values
| HEX | #637366 |
| RGB | rgb(99, 115, 102) |
| HSL | hsl(131, 7%, 42%) |
| OKLCH | oklch(53.8% 0.028 150.8) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #637366 | 5.03:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #637366 | 4.17:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #637366 text on white | 5.03:1 | AA | Lc 74.8 | Content text, not long reading |
| #637366 text on black | 4.17:1 | AA large text | Lc -26.9 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F5F6F5
oklch(97.2% 0.002 145.6)
-
Step 100
100
#E8EAE8
oklch(93.5% 0.003 145.5)
-
Step 200
200
#D6DAD7
oklch(88.4% 0.006 153.8)
-
Step 300
300
#BBC3BC
oklch(80.9% 0.013 149.2)
-
Step 400
400
#98A49A
oklch(70.6% 0.02 150.4)
-
Step 500
500
#7F8E82
oklch(63.1% 0.025 151.4)
-
Step 600
600 (this color)
#637366
oklch(53.8% 0.028 150.8)
-
Step 700
700
#576559
oklch(49.1% 0.026 149.3)
-
Step 800
800
#475249
oklch(42.6% 0.02 150.7)
-
Step 900
900
#3B443D
oklch(37.6% 0.017 152.1)
-
Step 950
950
#232824
oklch(27% 0.01 151.4)
#637366 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #737065 | 0.024 |
| Deuteranopia (no green cones) | #706E67 | 0.024 |
| Tritanopia (no blue cones) | #61726F | 0.015 |
| Achromatopsia (no color) | #6F6F6F | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637366
#637366
oklch(53.8% 0.028 150.8)
- #786976
#786976
oklch(53.9% 0.027 330.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #637366, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.033
- Battleship Gray #6C757D ΔE 0.038
- Grey Brown #7F7053 ΔE 0.046
- Battleship Grey #6B7C85 ΔE 0.050
- Dark Taupe #7F684E ΔE 0.052
- Slate #516572 ΔE 0.059
- Medium Grey #7D7F7C ΔE 0.060
- Grey Blue #647D8E ΔE 0.060
Use #637366 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.