#0381DA
Closest named color: Water Blue (#0E87CC). oklch(59.2% 0.164 249.4), rgb(3, 129, 218).
Aa
Black text reads best on this color (5.15:1).
About this color
#0381DA is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.164 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.030 away. Black text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.15:1 |
| White text | 4.07:1 |
Values
| HEX | #0381DA |
| RGB | rgb(3, 129, 218) |
| HSL | hsl(205, 97%, 43%) |
| OKLCH | oklch(59.2% 0.164 249.4) |
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 #0381DA | 4.07:1 | AA large text | Lc -72.7 | Content text, not long reading |
| Black text on #0381DA | 5.15:1 | AA | Lc 36.9 | Non-text elements, placeholder text |
| #0381DA text on white | 4.07:1 | AA large text | Lc 67.2 | Content text, not long reading |
| #0381DA text on black | 5.15:1 | AA | Lc -34.5 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#DFEBF8
oklch(93.5% 0.022 250.2)
-
Step 200
200
#C5DCF4
oklch(88.5% 0.041 249.4)
-
Step 300
300
#9CC5EF
oklch(80.9% 0.074 249.4)
-
Step 400
400
#63A6E7
oklch(70.8% 0.118 249.1)
-
Step 500
500
#308EE0
oklch(63.2% 0.151 249.2)
-
Step 600
600 (this color)
#0381DA
oklch(59.2% 0.164 249.4)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#094373
oklch(37.6% 0.099 249.8)
-
Step 950
950
#092843
oklch(27% 0.062 248.7)
#0381DA 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) | #5487DE | 0.051 |
| Deuteranopia (no green cones) | #3076D8 | 0.030 |
| Tritanopia (no blue cones) | #0097A3 | 0.118 |
| Achromatopsia (no color) | #7E7E7E | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0381DA
#0381DA
oklch(59.2% 0.164 249.4)
- #AE6D00
#AE6D00
oklch(59.1% 0.129 69.1)
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 #0381DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.030
- Windows Blue #3778BF ΔE 0.045
- Dark Sky Blue #448EE4 ΔE 0.052
- Clear Blue #247AFD ΔE 0.059
- Cerulean Blue #056EEE ΔE 0.061
- Cool Blue #4984B8 ΔE 0.063
- Nice Blue #107AB0 ΔE 0.065
- Steel Blue #4682B4 ΔE 0.065
Use #0381DA 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.