#375B73
Closest named color: YInMn Blue (#415A77). oklch(45.4% 0.057 239), rgb(55, 91, 115).
Aa
White text reads best on this color (7.22:1).
About this color
#375B73 is a medium-dark, muted blue. In OKLCH its lightness is 45%, its chroma 0.057 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.015 away. White text reads best on it, at 7.22:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.90:1 |
| White text | 7.22:1 |
Values
| HEX | #375B73 |
| RGB | rgb(55, 91, 115) |
| HSL | hsl(204, 35%, 33%) |
| OKLCH | oklch(45.4% 0.057 239) |
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 #375B73 | 7.22:1 | AAA | Lc -89.9 | Fine for body text |
| Black text on #375B73 | 2.90:1 | Fails | Lc 19.0 | Dividers and decoration only |
| #375B73 text on white | 7.22:1 | AAA | Lc 85.0 | Fine for body text |
| #375B73 text on black | 2.90:1 | Fails | Lc -17.0 | 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 800.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CFDBE4
oklch(88.5% 0.018 240)
-
Step 300
300
#AEC4D4
oklch(80.9% 0.033 239.5)
-
Step 400
400
#82A6BF
oklch(70.7% 0.054 238.8)
-
Step 500
500
#6290AF
oklch(63.2% 0.068 238.8)
-
Step 600
600
#48799A
oklch(55.5% 0.074 239.5)
-
Step 700
700
#396684
oklch(49.1% 0.069 239.5)
-
Step 800
800 (this color)
#375B73
oklch(45.4% 0.057 239)
-
Step 900
900
#2A4557
oklch(37.7% 0.045 238.8)
-
Step 950
950
#192833
oklch(26.9% 0.029 241)
#375B73 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) | #505B74 | 0.032 |
| Deuteranopia (no green cones) | #485473 | 0.028 |
| Tritanopia (no blue cones) | #186163 | 0.046 |
| Achromatopsia (no color) | #575757 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #375B73
#375B73
oklch(45.4% 0.057 239)
- #6E4F36
#6E4F36
oklch(45.5% 0.056 59.6)
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 #375B73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.015
- Light Navy Blue #2E5A88 ΔE 0.036
- Dusty Grape #545775 ΔE 0.040
- Petrol #005F6A ΔE 0.041
- Denim #3B638C ΔE 0.044
- Dusk #4E5481 ΔE 0.046
- Slate #516572 ΔE 0.048
- Denim Blue #3B5B92 ΔE 0.052
Use #375B73 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.