#37406E
Closest named color: Twilight Blue (#0A437A). oklch(38.6% 0.079 273.8), rgb(55, 64, 110).
Aa
White text reads best on this color (9.90:1).
About this color
#37406E is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.079 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.045 away. White text reads best on it, at 9.90:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.12:1 |
| White text | 9.90:1 |
Values
| HEX | #37406E |
| RGB | rgb(55, 64, 110) |
| HSL | hsl(230, 33%, 32%) |
| OKLCH | oklch(38.6% 0.079 273.8) |
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 #37406E | 9.90:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #37406E | 2.12:1 | Fails | Lc 11.1 | Not readable |
| #37406E text on white | 9.90:1 | AAA | Lc 92.9 | Preferred for body text |
| #37406E text on black | 2.12:1 | Fails | Lc -9.6 | Not readable |
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 900.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8F0
oklch(88.5% 0.034 274.5)
-
Step 300
300
#B4BFE8
oklch(81% 0.059 273.2)
-
Step 400
400
#8E9CDC
oklch(70.6% 0.095 274.2)
-
Step 500
500
#7383D2
oklch(63.1% 0.12 273.8)
-
Step 600
600
#5C6BBF
oklch(55.6% 0.131 273.8)
-
Step 700
700
#4C59A5
oklch(49.1% 0.122 273.8)
-
Step 800
800
#3E4986
oklch(42.7% 0.102 273.6)
-
Step 900
900 (this color)
#37406E
oklch(38.6% 0.079 273.8)
-
Step 950
950
#1F243F
oklch(27% 0.051 274.5)
#37406E 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) | #2E4570 | 0.018 |
| Deuteranopia (no green cones) | #29416D | 0.019 |
| Tritanopia (no blue cones) | #224A51 | 0.072 |
| Achromatopsia (no color) | #434343 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37406E
#37406E
oklch(38.6% 0.079 273.8)
- #524300
#524300
oklch(38.7% 0.079 94.4)
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 #37406E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.058
- Light Navy #155084 ΔE 0.058
- Cobalt #1E488F ΔE 0.060
- Charcoal #264653 ΔE 0.060
- Marine Blue #01386A ΔE 0.062
- Prussian Blue #1D3557 ΔE 0.063
Use #37406E 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.