#0383BC
Closest named color: Water Blue (#0E87CC). oklch(57.9% 0.128 237.9), rgb(3, 131, 188).
Aa
Black text reads best on this color (4.97:1).
About this color
#0383BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.128 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.026 away. Black text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 4.97:1 |
| White text | 4.21:1 |
Values
| HEX | #0383BC |
| RGB | rgb(3, 131, 188) |
| HSL | hsl(198, 97%, 37%) |
| OKLCH | oklch(57.9% 0.128 237.9) |
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 #0383BC | 4.21:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #0383BC | 4.97:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #0383BC text on white | 4.21:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #0383BC text on black | 4.97:1 | AA | Lc -33.2 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF4
oklch(93.6% 0.017 236.7)
-
Step 200
200
#C6DDEC
oklch(88.5% 0.032 236.4)
-
Step 300
300
#9FC7E2
oklch(81% 0.057 237.9)
-
Step 400
400
#67A9D3
oklch(70.7% 0.091 237.9)
-
Step 500
500
#3593C8
oklch(63.2% 0.117 237.8)
-
Step 600
600 (this color)
#0383BC
oklch(57.9% 0.128 237.9)
-
Step 700
700
#006897
oklch(49.1% 0.109 238.1)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#0D4765
oklch(37.8% 0.076 237.3)
-
Step 950
950
#0B2A3B
oklch(27.1% 0.048 236.5)
#0383BC 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) | #6783BF | 0.069 |
| Deuteranopia (no green cones) | #5075BB | 0.054 |
| Tritanopia (no blue cones) | #009297 | 0.083 |
| Achromatopsia (no color) | #7B7B7B | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0383BC
#0383BC
oklch(57.9% 0.128 237.9)
- #B1641B
#B1641B
oklch(58% 0.128 58)
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 #0383BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.026
- Nice Blue #107AB0 ΔE 0.028
- Blue NCS #118AB2 ΔE 0.029
- Steel Blue #4682B4 ΔE 0.033
- Windows Blue #3778BF ΔE 0.036
- Cool Blue #4984B8 ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.050
- Teal Blue #01889F ΔE 0.052
Use #0383BC 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.