#0372E1
Closest named color: Cerulean Blue (#056EEE). oklch(56.4% 0.189 255.8), rgb(3, 114, 225).
Aa
White text reads best on this color (4.66:1).
About this color
#0372E1 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.189 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.023 away. White text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.189) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.49:1 |
| White text | 4.66:1 |
Values
| HEX | #0372E1 |
| RGB | rgb(3, 114, 225) |
| HSL | hsl(210, 97%, 45%) |
| OKLCH | oklch(56.4% 0.189 255.8) |
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 #0372E1 | 4.66:1 | AA | Lc -77.1 | Fine for body text |
| Black text on #0372E1 | 4.49:1 | AA large text | Lc 32.5 | Non-text elements, placeholder text |
| #0372E1 text on white | 4.66:1 | AA | Lc 71.6 | Content text, not long reading |
| #0372E1 text on black | 4.49:1 | AA large text | Lc -30.1 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBF9
oklch(88.5% 0.048 256.2)
-
Step 300
300
#9CC3F7
oklch(80.8% 0.085 255.8)
-
Step 400
400
#64A2F4
oklch(70.6% 0.137 255.9)
-
Step 500
500
#3589F0
oklch(63.2% 0.174 255.6)
-
Step 600
600 (this color)
#0372E1
oklch(56.4% 0.189 255.8)
-
Step 700
700
#005EBC
oklch(49.2% 0.166 255.7)
-
Step 800
800
#004C9B
oklch(42.6% 0.144 255.8)
-
Step 900
900
#0E407C
oklch(37.6% 0.114 256)
-
Step 950
950
#0B2649
oklch(27% 0.073 256.3)
#0372E1 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) | #2A7EE5 | 0.037 |
| Deuteranopia (no green cones) | #006CDF | 0.016 |
| Tritanopia (no blue cones) | #008D9F | 0.141 |
| Achromatopsia (no color) | #747474 | 0.189 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0372E1
#0372E1
oklch(56.4% 0.189 255.8)
- #9D6A00
#9D6A00
oklch(56.4% 0.119 75.8)
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 #0372E1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.023
- Royal Blue #4169E1 ΔE 0.035
- Clear Blue #247AFD ΔE 0.049
- Bright Blue #0165FC ΔE 0.053
- Azul #1D5DEC ΔE 0.053
- Neon Blue #4361EE ΔE 0.053
- Windows Blue #3778BF ΔE 0.061
- Water Blue #0E87CC ΔE 0.070
Use #0372E1 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.