#37509B
Closest named color: Dusk Blue (#26538D). oklch(45.2% 0.126 267.4), rgb(55, 80, 155).
Aa
White text reads best on this color (7.54:1).
About this color
#37509B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.126 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.031 away. White text reads best on it, at 7.54:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.78:1 |
| White text | 7.54:1 |
Values
| HEX | #37509B |
| RGB | rgb(55, 80, 155) |
| HSL | hsl(225, 48%, 41%) |
| OKLCH | oklch(45.2% 0.126 267.4) |
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 #37509B | 7.54:1 | AAA | Lc -90.8 | Preferred for body text |
| Black text on #37509B | 2.78:1 | Fails | Lc 18.1 | Dividers and decoration only |
| #37509B text on white | 7.54:1 | AAA | Lc 86.0 | Fine for body text |
| #37509B text on black | 2.78:1 | Fails | Lc -16.1 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F5
oklch(88.5% 0.041 267.1)
-
Step 300
300
#ACC0F1
oklch(81% 0.073 267.4)
-
Step 400
400
#809EEA
oklch(70.8% 0.117 267)
-
Step 500
500
#6183E4
oklch(63% 0.151 267.4)
-
Step 600
600
#496BD2
oklch(55.7% 0.163 267.2)
-
Step 700
700
#3B58B6
oklch(49.1% 0.153 267.6)
-
Step 800
800 (this color)
#37509B
oklch(45.2% 0.126 267.4)
-
Step 900
900
#2B3E75
oklch(37.8% 0.097 267.3)
-
Step 950
950
#192445
oklch(26.9% 0.063 268.1)
#37509B 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) | #2A599E | 0.026 |
| Deuteranopia (no green cones) | #175099 | 0.029 |
| Tritanopia (no blue cones) | #00616E | 0.106 |
| Achromatopsia (no color) | #545454 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37509B
#37509B
oklch(45.2% 0.126 267.4)
- #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 #37509B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.031
- Denim Blue #3B5B92 ΔE 0.038
- Twilight #4E518B ΔE 0.040
- Cobalt #1E488F ΔE 0.041
- Blueberry #464196 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.047
- Light Navy #155084 ΔE 0.051
- Dusky Blue #475F94 ΔE 0.052
Use #37509B 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.