#37406F
Closest named color: Twilight Blue (#0A437A). oklch(38.7% 0.081 273.9), rgb(55, 64, 111).
Aa
White text reads best on this color (9.88:1).
About this color
#37406F is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.081 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 9.88:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.12:1 |
| White text | 9.88:1 |
Values
| HEX | #37406F |
| RGB | rgb(55, 64, 111) |
| HSL | hsl(230, 34%, 33%) |
| OKLCH | oklch(38.7% 0.081 273.9) |
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 #37406F | 9.88:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #37406F | 2.12:1 | Fails | Lc 11.1 | Not readable |
| #37406F text on white | 9.88:1 | AAA | Lc 92.8 | Preferred for body text |
| #37406F 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
#8D9CDD
oklch(70.6% 0.097 273.7)
-
Step 500
500
#7283D4
oklch(63.2% 0.123 273.4)
-
Step 600
600
#5C6BC1
oklch(55.7% 0.134 273.8)
-
Step 700
700
#4C58A7
oklch(49.1% 0.126 274.3)
-
Step 800
800
#3E4987
oklch(42.8% 0.103 273.7)
-
Step 900
900 (this color)
#37406F
oklch(38.7% 0.081 273.9)
-
Step 950
950
#1F243F
oklch(27% 0.051 274.5)
#37406F 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) | #2E4671 | 0.020 |
| Deuteranopia (no green cones) | #29416E | 0.019 |
| Tritanopia (no blue cones) | #224A52 | 0.071 |
| Achromatopsia (no color) | #434343 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37406F
#37406F
oklch(38.7% 0.081 273.9)
- #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 #37406F, 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 0.047
- Dark Slate Blue #483D8B ΔE 0.056
- Light Navy #155084 ΔE 0.057
- Cobalt #1E488F ΔE 0.059
- Charcoal #264653 ΔE 0.062
- Marine Blue #01386A ΔE 0.062
- Prussian Blue #1D3557 ΔE 0.064
Use #37406F 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.