#0383BB
Closest named color: Water Blue (#0E87CC). oklch(57.9% 0.127 237.5), rgb(3, 131, 187).
Aa
Black text reads best on this color (4.96:1).
About this color
#0383BB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.127 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.027 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 4.96:1 |
| White text | 4.22:1 |
Values
| HEX | #0383BB |
| RGB | rgb(3, 131, 187) |
| HSL | hsl(198, 97%, 37%) |
| OKLCH | oklch(57.9% 0.127 237.5) |
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 #0383BB | 4.22:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #0383BB | 4.96:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #0383BB text on white | 4.22:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #0383BB text on black | 4.96:1 | AA | Lc -33.1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF4
oklch(93.6% 0.017 236.7)
-
Step 200
200
#C7DDEC
oklch(88.6% 0.031 237.6)
-
Step 300
300
#9FC7E1
oklch(81% 0.056 236.9)
-
Step 400
400
#67A9D3
oklch(70.7% 0.091 237.9)
-
Step 500
500
#3593C7
oklch(63.1% 0.116 237.3)
-
Step 600
600 (this color)
#0383BB
oklch(57.9% 0.127 237.5)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
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)
#0383BB 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) | #6883BD | 0.070 |
| Deuteranopia (no green cones) | #5175BA | 0.055 |
| Tritanopia (no blue cones) | #009197 | 0.079 |
| Achromatopsia (no color) | #7B7B7B | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0383BB
#0383BB
oklch(57.9% 0.127 237.5)
- #B0641D
#B0641D
oklch(57.9% 0.126 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 #0383BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.027
- Nice Blue #107AB0 ΔE 0.028
- Blue NCS #118AB2 ΔE 0.028
- Steel Blue #4682B4 ΔE 0.033
- Cool Blue #4984B8 ΔE 0.036
- Windows Blue #3778BF ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.050
- Teal Blue #01889F ΔE 0.050
Use #0383BB 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.