#373BAD
Closest named color: Sapphire (#2138AB). oklch(42.6% 0.178 274.4), rgb(55, 59, 173).
Aa
White text reads best on this color (8.78:1).
About this color
#373BAD is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.178 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.029 away. White text reads best on it, at 8.78:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.39:1 |
| White text | 8.78:1 |
Values
| HEX | #373BAD |
| RGB | rgb(55, 59, 173) |
| HSL | hsl(238, 52%, 45%) |
| OKLCH | oklch(42.6% 0.178 274.4) |
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 #373BAD | 8.78:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #373BAD | 2.39:1 | Fails | Lc 14.5 | Not readable |
| #373BAD text on white | 8.78:1 | AAA | Lc 89.5 | Fine for body text |
| #373BAD text on black | 2.39:1 | Fails | Lc -12.8 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CDD7FF
oklch(88.4% 0.056 274.2)
-
Step 300
300
#ADBCFF
oklch(80.8% 0.096 274.3)
-
Step 400
400
#8597FF
oklch(70.8% 0.153 274.4)
-
Step 500
500
#6978FF
oklch(63.1% 0.199 274.4)
-
Step 600
600
#5258F6
oklch(55.5% 0.231 274.3)
-
Step 700
700
#4446D7
oklch(49.1% 0.215 274.4)
-
Step 800
800 (this color)
#373BAD
oklch(42.6% 0.178 274.4)
-
Step 900
900
#2F3589
oklch(37.8% 0.138 274.6)
-
Step 950
950
#1B2050
oklch(27% 0.087 274.5)
#373BAD 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) | #0050B1 | 0.056 |
| Deuteranopia (no green cones) | #0045AB | 0.044 |
| Tritanopia (no blue cones) | #00596E | 0.145 |
| Achromatopsia (no color) | #4B4B4B | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373BAD
#373BAD
oklch(42.6% 0.178 274.4)
- #5E4D00
#5E4D00
oklch(42.5% 0.087 94.3)
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 #373BAD, closest first.
No curated palette has a color within ΔE 0.04 of #373BAD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.029
- Majorelle Blue #3F37C9 ΔE 0.046
- Blueberry #464196 ΔE 0.047
- Blue Blue #2242C7 ΔE 0.048
- Indigo Blue #3A18B1 ΔE 0.057
- Blue With A Hint Of Purple #533CC6 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.062
- Cobalt #1E488F ΔE 0.064
Use #373BAD 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.