#375B78
Closest named color: YInMn Blue (#415A77). oklch(45.7% 0.063 244.1), rgb(55, 91, 120).
Aa
White text reads best on this color (7.16:1).
About this color
#375B78 is a medium-dark, muted blue. In OKLCH its lightness is 46%, its chroma 0.063 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.012 away. White text reads best on it, at 7.16:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.93:1 |
| White text | 7.16:1 |
Values
| HEX | #375B78 |
| RGB | rgb(55, 91, 120) |
| HSL | hsl(207, 37%, 34%) |
| OKLCH | oklch(45.7% 0.063 244.1) |
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 #375B78 | 7.16:1 | AAA | Lc -89.7 | Fine for body text |
| Black text on #375B78 | 2.93:1 | Fails | Lc 19.3 | Dividers and decoration only |
| #375B78 text on white | 7.16:1 | AAA | Lc 84.8 | Fine for body text |
| #375B78 text on black | 2.93:1 | Fails | Lc -17.2 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE6
oklch(88.5% 0.021 243.4)
-
Step 300
300
#ADC4D7
oklch(80.9% 0.037 243.1)
-
Step 400
400
#81A5C3
oklch(70.6% 0.059 243.9)
-
Step 500
500
#618FB4
oklch(63.2% 0.075 243.6)
-
Step 600
600
#4778A0
oklch(55.5% 0.082 244.7)
-
Step 700
700
#386589
oklch(49.1% 0.076 244.4)
-
Step 800
800 (this color)
#375B78
oklch(45.7% 0.063 244.1)
-
Step 900
900
#2A445A
oklch(37.6% 0.05 245.2)
-
Step 950
950
#192835
oklch(27% 0.032 245.5)
#375B78 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) | #4F5B79 | 0.031 |
| Deuteranopia (no green cones) | #465577 | 0.024 |
| Tritanopia (no blue cones) | #136265 | 0.052 |
| Achromatopsia (no color) | #585858 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #375B78
#375B78
oklch(45.7% 0.063 244.1)
- #704F30
#704F30
oklch(45.6% 0.063 63.3)
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 #375B78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.012
- Light Navy Blue #2E5A88 ΔE 0.028
- Denim #3B638C ΔE 0.037
- Dusty Grape #545775 ΔE 0.038
- Dusk #4E5481 ΔE 0.040
- Denim Blue #3B5B92 ΔE 0.044
- Petrol #005F6A ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.049
Use #375B78 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.