#37558D
Closest named color: Dusk Blue (#26538D). oklch(45.4% 0.099 261.9), rgb(55, 85, 141).
Aa
White text reads best on this color (7.37:1).
About this color
#37558D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.099 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.019 away. White text reads best on it, at 7.37:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.84:1 |
| White text | 7.37:1 |
Values
| HEX | #37558D |
| RGB | rgb(55, 85, 141) |
| HSL | hsl(219, 44%, 38%) |
| OKLCH | oklch(45.4% 0.099 261.9) |
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 #37558D | 7.37:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #37558D | 2.84:1 | Fails | Lc 18.6 | Dividers and decoration only |
| #37558D text on white | 7.37:1 | AAA | Lc 85.5 | Fine for body text |
| #37558D text on black | 2.84:1 | Fails | Lc -16.6 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAEF
oklch(88.6% 0.032 261.7)
-
Step 300
300
#ACC1E7
oklch(80.8% 0.059 262.3)
-
Step 400
400
#81A1DB
oklch(70.8% 0.093 262)
-
Step 500
500
#6188D1
oklch(63% 0.119 262.1)
-
Step 600
600
#4871BE
oklch(55.6% 0.129 261.9)
-
Step 700
700
#3A5EA4
oklch(49.1% 0.12 262.3)
-
Step 800
800 (this color)
#37558D
oklch(45.4% 0.099 261.9)
-
Step 900
900
#2A416A
oklch(37.7% 0.076 261.3)
-
Step 950
950
#19263E
oklch(27% 0.049 262)
#37558D 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) | #3D5A8F | 0.017 |
| Deuteranopia (no green cones) | #32528C | 0.011 |
| Tritanopia (no blue cones) | #00626A | 0.087 |
| Achromatopsia (no color) | #565656 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37558D
#37558D
oklch(45.4% 0.099 261.9)
- #705000
#705000
oklch(45.4% 0.094 81.9)
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 #37558D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.019
- Denim Blue #3B5B92 ΔE 0.019
- Light Navy Blue #2E5A88 ΔE 0.020
- Twilight #4E518B ΔE 0.031
- Dusk #4E5481 ΔE 0.035
- Dusky Blue #475F94 ΔE 0.038
- Light Navy #155084 ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.043
Use #37558D 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.