#373EAC
Closest named color: Sapphire (#2138AB). oklch(43% 0.173 273.8), rgb(55, 62, 172).
Aa
White text reads best on this color (8.58:1).
About this color
#373EAC is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.173 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.032 away. White text reads best on it, at 8.58:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.44:1 |
| White text | 8.58:1 |
Values
| HEX | #373EAC |
| RGB | rgb(55, 62, 172) |
| HSL | hsl(236, 52%, 45%) |
| OKLCH | oklch(43% 0.173 273.8) |
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 #373EAC | 8.58:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #373EAC | 2.44:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #373EAC text on white | 8.58:1 | AAA | Lc 88.9 | Fine for body text |
| #373EAC text on black | 2.44:1 | Fails | Lc -13.3 | 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
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CDD7FF
oklch(88.4% 0.056 274.2)
-
Step 300
300
#ADBDFF
oklch(81% 0.095 273.6)
-
Step 400
400
#8397FF
oklch(70.7% 0.153 273.6)
-
Step 500
500
#6778FF
oklch(63% 0.199 273.8)
-
Step 600
600
#515AF3
oklch(55.5% 0.225 273.8)
-
Step 700
700
#4349D4
oklch(49.2% 0.209 273.8)
-
Step 800
800 (this color)
#373EAC
oklch(43% 0.173 273.8)
-
Step 900
900
#2E3687
oklch(37.7% 0.134 273.8)
-
Step 950
950
#1A204F
oklch(26.8% 0.086 273.7)
#373EAC 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) | #0051B0 | 0.053 |
| Deuteranopia (no green cones) | #0047AA | 0.042 |
| Tritanopia (no blue cones) | #005A6F | 0.140 |
| Achromatopsia (no color) | #4C4C4C | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373EAC
#373EAC
oklch(43% 0.173 273.8)
- #604E00
#604E00
oklch(43% 0.088 93.6)
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 #373EAC, closest first.
No curated palette has a color within ΔE 0.04 of #373EAC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.032
- Blueberry #464196 ΔE 0.043
- Majorelle Blue #3F37C9 ΔE 0.048
- Blue Blue #2242C7 ΔE 0.048
- Blue With A Hint Of Purple #533CC6 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.059
- Cobalt #1E488F ΔE 0.060
- Indigo Blue #3A18B1 ΔE 0.063
Use #373EAC 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.