#0183B3
Closest named color: Blue NCS (#118AB2). oklch(57.4% 0.119 233.2), rgb(1, 131, 179).
Aa
Black text reads best on this color (4.89:1).
About this color
#0183B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.119 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.022 away. Black text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 4.89:1 |
| White text | 4.28:1 |
Values
| HEX | #0183B3 |
| RGB | rgb(1, 131, 179) |
| HSL | hsl(196, 99%, 35%) |
| OKLCH | oklch(57.4% 0.119 233.2) |
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 #0183B3 | 4.28:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #0183B3 | 4.89:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #0183B3 text on white | 4.28:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #0183B3 text on black | 4.89:1 | AA | Lc -32.6 | 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
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C7DDEA
oklch(88.5% 0.03 233.6)
-
Step 300
300
#9FC7DE
oklch(80.9% 0.054 233.5)
-
Step 400
400
#67AACE
oklch(70.7% 0.086 233.3)
-
Step 500
500
#3694C1
oklch(63.1% 0.11 233.3)
-
Step 600
600 (this color)
#0183B3
oklch(57.4% 0.119 233.2)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#0D4761
oklch(37.6% 0.071 233.5)
-
Step 950
950
#0B2A39
oklch(27% 0.045 233.1)
#0183B3 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) | #6B82B5 | 0.074 |
| Deuteranopia (no green cones) | #5674B2 | 0.061 |
| Tritanopia (no blue cones) | #009093 | 0.072 |
| Achromatopsia (no color) | #7A7A7A | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0183B3
#0183B3
oklch(57.4% 0.119 233.2)
- #AE622C
#AE622C
oklch(57.4% 0.119 53)
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 #0183B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.022
- Nice Blue #107AB0 ΔE 0.025
- Steel Blue #4682B4 ΔE 0.034
- Cool Blue #4984B8 ΔE 0.039
- Teal Blue #01889F ΔE 0.039
- Water Blue #0E87CC ΔE 0.039
- Cerulean #457B9D ΔE 0.044
- Windows Blue #3778BF ΔE 0.044
Use #0183B3 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.