#372AAC
Closest named color: Indigo Blue (#3A18B1). oklch(39.9% 0.195 277.3), rgb(55, 42, 172).
Aa
White text reads best on this color (10.05:1).
About this color
#372AAC is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.195 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Indigo Blue (#3A18B1), ΔE 0.024 away. White text reads best on it, at 10.05:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.195) |
| Temperature | cool |
| Nearest name | Indigo Blue (#3A18B1) |
| Black text | 2.08:1 |
| White text | 10.05:1 |
Values
| HEX | #372AAC |
| RGB | rgb(55, 42, 172) |
| HSL | hsl(246, 61%, 42%) |
| OKLCH | oklch(39.9% 0.195 277.3) |
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 #372AAC | 10.05:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #372AAC | 2.08:1 | Fails | Lc 11.6 | Not readable |
| #372AAC text on white | 10.05:1 | AAA | Lc 92.4 | Preferred for body text |
| #372AAC text on black | 2.08:1 | Fails | Lc -10.1 | 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 900.
-
Step 50
50
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E8FF
oklch(93.5% 0.031 277.9)
-
Step 200
200
#CFD6FF
oklch(88.4% 0.057 277.5)
-
Step 300
300
#B1BBFF
oklch(80.9% 0.097 277.5)
-
Step 400
400
#8A95FF
oklch(70.7% 0.154 277.2)
-
Step 500
500
#7075FF
oklch(63.1% 0.201 277.4)
-
Step 600
600
#5B50FF
oklch(55.7% 0.248 277.4)
-
Step 700
700
#4E17FF
oklch(49.1% 0.292 277.4)
-
Step 800
800
#3F15D2
oklch(42.7% 0.25 277.4)
-
Step 900
900 (this color)
#372AAC
oklch(39.9% 0.195 277.3)
-
Step 950
950
#1C1760
oklch(26.9% 0.123 277.2)
#372AAC 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) | #0047B0 | 0.067 |
| Deuteranopia (no green cones) | #003CAA | 0.053 |
| Tritanopia (no blue cones) | #005069 | 0.156 |
| Achromatopsia (no color) | #424242 | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #372AAC
#372AAC
oklch(39.9% 0.195 277.3)
- #544700
#544700
oklch(39.9% 0.082 97.2)
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 #372AAC, closest first.
No curated palette has a color within ΔE 0.04 of #372AAC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo Blue #3A18B1 ΔE 0.024
- Sapphire #2138AB ΔE 0.034
- Imperial Purple #480CA8 ΔE 0.045
- Majorelle Blue #3F37C9 ΔE 0.057
- Ultramarine #2000B1 ΔE 0.062
- Chrysanthemum #560BAD ΔE 0.063
- Violet Blue #510AC9 ΔE 0.064
- Blue Blue #2242C7 ΔE 0.067
Use #372AAC 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.