#37509E
Closest named color: Dusk Blue (#26538D). oklch(45.4% 0.13 267.6), rgb(55, 80, 158).
Aa
White text reads best on this color (7.49:1).
About this color
#37509E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.130 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.035 away. White text reads best on it, at 7.49:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.80:1 |
| White text | 7.49:1 |
Values
| HEX | #37509E |
| RGB | rgb(55, 80, 158) |
| HSL | hsl(225, 48%, 42%) |
| OKLCH | oklch(45.4% 0.13 267.6) |
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 #37509E | 7.49:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #37509E | 2.80:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #37509E text on white | 7.49:1 | AAA | Lc 85.8 | Fine for body text |
| #37509E text on black | 2.80:1 | Fails | Lc -16.3 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F6
oklch(88.5% 0.042 267.7)
-
Step 300
300
#ABC0F3
oklch(81% 0.076 267.3)
-
Step 400
400
#7F9DED
oklch(70.7% 0.122 267.6)
-
Step 500
500
#6083E7
oklch(63.2% 0.155 267.4)
-
Step 600
600
#486AD5
oklch(55.6% 0.169 267.4)
-
Step 700
700
#3A57B8
oklch(49% 0.157 267.7)
-
Step 800
800 (this color)
#37509E
oklch(45.4% 0.13 267.6)
-
Step 900
900
#2A3D77
oklch(37.7% 0.102 267.7)
-
Step 950
950
#192446
oklch(27% 0.065 268.3)
#37509E 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) | #275AA1 | 0.029 |
| Deuteranopia (no green cones) | #10509C | 0.032 |
| Tritanopia (no blue cones) | #00626F | 0.110 |
| Achromatopsia (no color) | #555555 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37509E
#37509E
oklch(45.4% 0.13 267.6)
- #6C5200
#6C5200
oklch(45.3% 0.093 87.4)
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 #37509E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.040
- Blueberry #464196 ΔE 0.042
- Twilight #4E518B ΔE 0.044
- Cobalt #1E488F ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.051
- Dusky Blue #475F94 ΔE 0.054
- Light Navy #155084 ΔE 0.055
Use #37509E 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.