#37637F
Closest named color: Denim (#3B638C). oklch(48% 0.067 238.2), rgb(55, 99, 127).
Aa
White text reads best on this color (6.45:1).
About this color
#37637F is a medium-dark, muted blue. In OKLCH its lightness is 48%, its chroma 0.067 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.022 away. White text reads best on it, at 6.45:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.25:1 |
| White text | 6.45:1 |
Values
| HEX | #37637F |
| RGB | rgb(55, 99, 127) |
| HSL | hsl(203, 40%, 36%) |
| OKLCH | oklch(48% 0.067 238.2) |
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 #37637F | 6.45:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #37637F | 3.25:1 | AA large text | Lc 22.1 | Dividers and decoration only |
| #37637F text on white | 6.45:1 | AA | Lc 81.9 | Fine for body text |
| #37637F text on black | 3.25:1 | AA large text | Lc -20.0 | 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 700.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CFDBE4
oklch(88.5% 0.018 240)
-
Step 300
300
#AEC4D3
oklch(80.8% 0.032 237.7)
-
Step 400
400
#83A6BD
oklch(70.7% 0.051 237.2)
-
Step 500
500
#6390AD
oklch(63.2% 0.066 237.5)
-
Step 600
600
#497999
oklch(55.5% 0.072 239.1)
-
Step 700
700 (this color)
#37637F
oklch(48% 0.067 238.2)
-
Step 800
800
#31536A
oklch(42.6% 0.055 239.5)
-
Step 900
900
#2B4556
oklch(37.7% 0.043 238.1)
-
Step 950
950
#1A2832
oklch(26.9% 0.027 240.1)
#37637F 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) | #566380 | 0.038 |
| Deuteranopia (no green cones) | #4C5B7F | 0.032 |
| Tritanopia (no blue cones) | #016A6C | 0.054 |
| Achromatopsia (no color) | #5E5E5E | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37637F
#37637F
oklch(48% 0.067 238.2)
- #7A5437
#7A5437
oklch(48% 0.066 57.7)
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 #37637F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.022
- YInMn Blue #415A77 ΔE 0.027
- Light Navy Blue #2E5A88 ΔE 0.036
- Slate #516572 ΔE 0.038
- Peacock Blue #016795 ΔE 0.042
- Dusky Blue #475F94 ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.044
- Dusty Grape #545775 ΔE 0.046
Use #37637F 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.