#637090
Closest named color: Metallic Blue (#4F738E). oklch(54.7% 0.053 267.4), rgb(99, 112, 144).
Aa
White text reads best on this color (4.94:1).
About this color
#637090 is a medium-dark, muted blue. In OKLCH its lightness is 55%, its chroma 0.053 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.027 away. White text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.25:1 |
| White text | 4.94:1 |
Values
| HEX | #637090 |
| RGB | rgb(99, 112, 144) |
| HSL | hsl(223, 19%, 48%) |
| OKLCH | oklch(54.7% 0.053 267.4) |
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 #637090 | 4.94:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #637090 | 4.25:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #637090 text on white | 4.94:1 | AA | Lc 74.2 | Content text, not long reading |
| #637090 text on black | 4.25:1 | AA large text | Lc -27.5 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E8EAEF
oklch(93.7% 0.007 268.5)
-
Step 200
200
#D5D9E2
oklch(88.5% 0.013 266.7)
-
Step 300
300
#BAC0D0
oklch(80.8% 0.023 269.4)
-
Step 400
400
#96A0B9
oklch(70.6% 0.038 268.1)
-
Step 500
500
#7C89A8
oklch(63.1% 0.049 267.1)
-
Step 600
600 (this color)
#637090
oklch(54.7% 0.053 267.4)
-
Step 700
700
#54607D
oklch(49% 0.049 267.1)
-
Step 800
800
#454F66
oklch(42.8% 0.04 266.4)
-
Step 900
900
#3A4153
oklch(37.6% 0.032 268.2)
-
Step 950
950
#222630
oklch(26.9% 0.02 267.9)
#637090 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) | #667291 | 0.008 |
| Deuteranopia (no green cones) | #626E8F | 0.006 |
| Tritanopia (no blue cones) | #57767B | 0.046 |
| Achromatopsia (no color) | #707070 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637090
#637090
oklch(54.7% 0.053 267.4)
- #7E6F4D
#7E6F4D
oklch(54.7% 0.052 86.8)
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 #637090, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.027
- Dull Blue #49759C ΔE 0.035
- Stormy Blue #507B9C ΔE 0.036
- Battleship Gray #6C757D ΔE 0.039
- Grey Blue #647D8E ΔE 0.040
- Cerulean #457B9D ΔE 0.043
- Battleship Grey #6B7C85 ΔE 0.046
- Grey Purple #826D8C ΔE 0.046
Use #637090 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.