#37499D
Closest named color: Blueberry (#464196). oklch(43.9% 0.138 270.6), rgb(55, 73, 157).
Aa
White text reads best on this color (8.06:1).
About this color
#37499D is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.138 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.028 away. White text reads best on it, at 8.06:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.60:1 |
| White text | 8.06:1 |
Values
| HEX | #37499D |
| RGB | rgb(55, 73, 157) |
| HSL | hsl(229, 48%, 42%) |
| OKLCH | oklch(43.9% 0.138 270.6) |
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 #37499D | 8.06:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #37499D | 2.60:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #37499D text on white | 8.06:1 | AAA | Lc 87.6 | Fine for body text |
| #37499D text on black | 2.60:1 | Fails | Lc -14.5 | 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 800.
-
Step 50
50
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F8
oklch(88.5% 0.045 271.7)
-
Step 300
300
#ADBFF6
oklch(81% 0.081 270.5)
-
Step 400
400
#829BF1
oklch(70.6% 0.129 270.5)
-
Step 500
500
#6580EC
oklch(63.2% 0.164 270.5)
-
Step 600
600
#4E66DA
oklch(55.5% 0.179 270.7)
-
Step 700
700
#3F54BD
oklch(49% 0.166 270.5)
-
Step 800
800 (this color)
#37499D
oklch(43.9% 0.138 270.6)
-
Step 900
900
#2D3B7A
oklch(37.6% 0.108 271)
-
Step 950
950
#1A2347
oklch(26.9% 0.068 270.7)
#37499D 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) | #1455A0 | 0.039 |
| Deuteranopia (no green cones) | #004C9B | 0.039 |
| Tritanopia (no blue cones) | #005D6C | 0.116 |
| Achromatopsia (no color) | #505050 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37499D
#37499D
oklch(43.9% 0.138 270.6)
- #654F00
#654F00
oklch(43.8% 0.09 90.2)
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 #37499D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.028
- Cobalt #1E488F ΔE 0.036
- Dusk Blue #26538D ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.045
- Twilight #4E518B ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.057
- Sapphire #2138AB ΔE 0.057
- Light Navy #155084 ΔE 0.057
Use #37499D 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.