#637883
Closest named color: Battleship Gray (#6C757D). oklch(56% 0.03 230.8), rgb(99, 120, 131).
Aa
White text reads best on this color (4.62:1).
About this color
#637883 is a medium-dark, muted blue. In OKLCH its lightness is 56%, its chroma 0.030 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Battleship Gray (#6C757D), ΔE 0.015 away. White text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Battleship Gray (#6C757D) |
| Black text | 4.54:1 |
| White text | 4.62:1 |
Values
| HEX | #637883 |
| RGB | rgb(99, 120, 131) |
| HSL | hsl(201, 14%, 45%) |
| OKLCH | oklch(56% 0.03 230.8) |
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 #637883 | 4.62:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #637883 | 4.54:1 | AA | Lc 32.0 | Non-text elements, placeholder text |
| #637883 text on white | 4.62:1 | AA | Lc 72.1 | Content text, not long reading |
| #637883 text on black | 4.54:1 | AA | Lc -29.6 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D4DADD
oklch(88.5% 0.008 228.9)
-
Step 300
300
#B8C2C8
oklch(80.8% 0.014 233.8)
-
Step 400
400
#94A3AC
oklch(70.7% 0.022 234)
-
Step 500
500
#798D97
oklch(63.1% 0.027 229.4)
-
Step 600
600 (this color)
#637883
oklch(56% 0.03 230.8)
-
Step 700
700
#51646E
oklch(49.1% 0.028 231)
-
Step 800
800
#425259
oklch(42.8% 0.023 226.3)
-
Step 900
900
#384449
oklch(37.8% 0.018 225)
-
Step 950
950
#21282B
oklch(27.1% 0.011 225.5)
#637883 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) | #737784 | 0.023 |
| Deuteranopia (no green cones) | #6E7383 | 0.020 |
| Tritanopia (no blue cones) | #5A7B7B | 0.021 |
| Achromatopsia (no color) | #757575 | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #637883
#637883
oklch(56% 0.03 230.8)
- #837065
#837065
oklch(56% 0.029 51.9)
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 #637883, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Gray #6C757D ΔE 0.015
- Battleship Grey #6B7C85 ΔE 0.017
- Grey Blue #647D8E ΔE 0.019
- Slate Gray #708090 ΔE 0.034
- Steel Grey #6F828A ΔE 0.035
- Metallic Blue #4F738E ΔE 0.036
- Stormy Blue #507B9C ΔE 0.041
- Medium Grey #7D7F7C ΔE 0.046
Use #637883 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.