#37508A
Closest named color: Dusk Blue (#26538D). oklch(44.1% 0.101 265), rgb(55, 80, 138).
Aa
White text reads best on this color (7.84:1).
About this color
#37508A is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.101 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.018 away. White text reads best on it, at 7.84:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.67:1 |
| White text | 7.84:1 |
Values
| HEX | #37508A |
| RGB | rgb(55, 80, 138) |
| HSL | hsl(222, 43%, 38%) |
| OKLCH | oklch(44.1% 0.101 265) |
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 #37508A | 7.84:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #37508A | 2.67:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #37508A text on white | 7.84:1 | AAA | Lc 87.1 | Fine for body text |
| #37508A text on black | 2.67:1 | Fails | Lc -15.1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CFD9EF
oklch(88.4% 0.032 266.1)
-
Step 300
300
#AEC1E8
oklch(81% 0.059 264.6)
-
Step 400
400
#84A0DC
oklch(70.8% 0.094 264.9)
-
Step 500
500
#6587D2
oklch(63.1% 0.12 264.7)
-
Step 600
600
#4D6FBF
oklch(55.5% 0.131 265.1)
-
Step 700
700
#3E5DA5
oklch(49.1% 0.121 264.8)
-
Step 800
800 (this color)
#37508A
oklch(44.1% 0.101 265)
-
Step 900
900
#2D406B
oklch(37.7% 0.078 264.9)
-
Step 950
950
#1A263F
oklch(27.1% 0.05 263.9)
#37508A 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) | #37568C | 0.017 |
| Deuteranopia (no green cones) | #2C4E89 | 0.015 |
| Tritanopia (no blue cones) | #005D66 | 0.089 |
| Achromatopsia (no color) | #525252 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37508A
#37508A
oklch(44.1% 0.101 265)
- #694E00
#694E00
oklch(44.1% 0.09 85.6)
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 #37508A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.018
- Light Navy Blue #2E5A88 ΔE 0.031
- Twilight #4E518B ΔE 0.032
- Light Navy #155084 ΔE 0.033
- Denim Blue #3B5B92 ΔE 0.034
- Dusk #4E5481 ΔE 0.038
- Cobalt #1E488F ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.041
Use #37508A 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.