#37379B
Closest named color: Sapphire (#2138AB). oklch(40.3% 0.158 276.6), rgb(55, 55, 155).
Aa
White text reads best on this color (9.62:1).
About this color
#37379B is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.158 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.037 away. White text reads best on it, at 9.62:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.18:1 |
| White text | 9.62:1 |
Values
| HEX | #37379B |
| RGB | rgb(55, 55, 155) |
| HSL | hsl(240, 48%, 41%) |
| OKLCH | oklch(40.3% 0.158 276.6) |
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 #37379B | 9.62:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #37379B | 2.18:1 | Fails | Lc 12.2 | Not readable |
| #37379B text on white | 9.62:1 | AAA | Lc 91.8 | Preferred for body text |
| #37379B text on black | 2.18:1 | Fails | Lc -10.6 | 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 800.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D0D7FC
oklch(88.6% 0.052 276.9)
-
Step 300
300
#B1BCFD
oklch(81% 0.093 276.7)
-
Step 400
400
#8996FB
oklch(70.7% 0.148 276.4)
-
Step 500
500
#6F78F9
oklch(63.1% 0.189 276.5)
-
Step 600
600
#5A5DE8
oklch(55.7% 0.205 276.5)
-
Step 700
700
#4B4BCA
oklch(49.2% 0.192 276.7)
-
Step 800
800 (this color)
#37379B
oklch(40.3% 0.158 276.6)
-
Step 900
900
#333781
oklch(37.8% 0.123 276.5)
-
Step 950
950
#1E214C
oklch(27.1% 0.078 276.8)
#37379B 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) | #00499E | 0.055 |
| Deuteranopia (no green cones) | #004099 | 0.048 |
| Tritanopia (no blue cones) | #005064 | 0.130 |
| Achromatopsia (no color) | #454545 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37379B
#37379B
oklch(40.3% 0.158 276.6)
- #554800
#554800
oklch(40.3% 0.083 97.3)
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 #37379B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.037
- Blueberry #464196 ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.042
- Cobalt #1E488F ΔE 0.052
- Indigo Blue #3A18B1 ΔE 0.059
- Imperial Purple #480CA8 ΔE 0.067
- Majorelle Blue #3F37C9 ΔE 0.075
- Twilight Blue #0A437A ΔE 0.077
Use #37379B 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.