#37557B
Closest named color: YInMn Blue (#415A77). oklch(44.4% 0.072 254.9), rgb(55, 85, 123).
Aa
White text reads best on this color (7.64:1).
About this color
#37557B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.072 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.023 away. White text reads best on it, at 7.64:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.74:1 |
| White text | 7.64:1 |
Values
| HEX | #37557B |
| RGB | rgb(55, 85, 123) |
| HSL | hsl(214, 38%, 35%) |
| OKLCH | oklch(44.4% 0.072 254.9) |
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 #37557B | 7.64:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #37557B | 2.74:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #37557B text on white | 7.64:1 | AAA | Lc 86.4 | Fine for body text |
| #37557B text on black | 2.74:1 | Fails | Lc -15.6 | 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 800.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EAF2
oklch(93.5% 0.013 255.5)
-
Step 200
200
#CFDAE9
oklch(88.5% 0.024 256.1)
-
Step 300
300
#AFC3DC
oklch(81% 0.042 254.1)
-
Step 400
400
#84A3CB
oklch(70.7% 0.068 255)
-
Step 500
500
#658CBD
oklch(63.1% 0.086 254.6)
-
Step 600
600
#4C75AA
oklch(55.6% 0.095 255.3)
-
Step 700
700
#3D6291
oklch(49% 0.087 255)
-
Step 800
800 (this color)
#37557B
oklch(44.4% 0.072 254.9)
-
Step 900
900
#2C435F
oklch(37.7% 0.056 253.9)
-
Step 950
950
#1A2738
oklch(26.9% 0.037 255.4)
#37557B 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) | #46577D | 0.021 |
| Deuteranopia (no green cones) | #3D507A | 0.016 |
| Tritanopia (no blue cones) | #115E62 | 0.065 |
| Achromatopsia (no color) | #535353 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37557B
#37557B
oklch(44.4% 0.072 254.9)
- #6B4D21
#6B4D21
oklch(44.3% 0.072 74.3)
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 #37557B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.023
- Light Navy Blue #2E5A88 ΔE 0.023
- Dusk #4E5481 ΔE 0.033
- Dusk Blue #26538D ΔE 0.036
- Deep Sea Blue #015482 ΔE 0.038
- Light Navy #155084 ΔE 0.039
- Denim Blue #3B5B92 ΔE 0.039
- Dusty Grape #545775 ΔE 0.042
Use #37557B 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.