#373FA1
Closest named color: Blueberry (#464196). oklch(42.2% 0.156 274), rgb(55, 63, 161).
Aa
White text reads best on this color (8.79:1).
About this color
#373FA1 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.156 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.030 away. White text reads best on it, at 8.79:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.38:1 |
| White text | 8.79:1 |
Values
| HEX | #373FA1 |
| RGB | rgb(55, 63, 161) |
| HSL | hsl(235, 49%, 42%) |
| OKLCH | oklch(42.2% 0.156 274) |
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 #373FA1 | 8.79:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #373FA1 | 2.38:1 | Fails | Lc 14.3 | Not readable |
| #373FA1 text on white | 8.79:1 | AAA | Lc 89.6 | Fine for body text |
| #373FA1 text on black | 2.38:1 | Fails | Lc -12.6 | 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
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CED7FC
oklch(88.4% 0.052 274.5)
-
Step 300
300
#AEBDFC
oklch(81% 0.091 273.9)
-
Step 400
400
#8598FB
oklch(70.8% 0.146 273.9)
-
Step 500
500
#697AF8
oklch(63% 0.187 274)
-
Step 600
600
#545FE7
oklch(55.6% 0.203 274.2)
-
Step 700
700
#454DC9
oklch(49.1% 0.189 274.2)
-
Step 800
800 (this color)
#373FA1
oklch(42.2% 0.156 274)
-
Step 900
900
#303881
oklch(37.8% 0.122 274.3)
-
Step 950
950
#1C214B
oklch(26.9% 0.077 274.9)
#373FA1 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) | #004FA4 | 0.051 |
| Deuteranopia (no green cones) | #00469F | 0.043 |
| Tritanopia (no blue cones) | #00576A | 0.129 |
| Achromatopsia (no color) | #4A4A4A | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373FA1
#373FA1
oklch(42.2% 0.156 274)
- #5D4C00
#5D4C00
oklch(42.2% 0.086 94.1)
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 #373FA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.030
- Sapphire #2138AB ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.044
- Cobalt #1E488F ΔE 0.046
- Blue Blue #2242C7 ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.066
- Dusk Blue #26538D ΔE 0.066
- Indigo Blue #3A18B1 ΔE 0.070
Use #373FA1 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.