#0181D6
Closest named color: Water Blue (#0E87CC). oklch(59% 0.159 248.2), rgb(1, 129, 214).
Aa
Black text reads best on this color (5.11:1).
About this color
#0181D6 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.159 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.025 away. Black text reads best on it, at 5.11:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.11:1 |
| White text | 4.10:1 |
Values
| HEX | #0181D6 |
| RGB | rgb(1, 129, 214) |
| HSL | hsl(204, 99%, 42%) |
| OKLCH | oklch(59% 0.159 248.2) |
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 #0181D6 | 4.10:1 | AA large text | Lc -73.0 | Content text, not long reading |
| Black text on #0181D6 | 5.11:1 | AA | Lc 36.6 | Non-text elements, placeholder text |
| #0181D6 text on white | 4.10:1 | AA large text | Lc 67.5 | Content text, not long reading |
| #0181D6 text on black | 5.11:1 | AA | Lc -34.2 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C5DCF3
oklch(88.5% 0.04 248.3)
-
Step 300
300
#9CC5ED
oklch(80.8% 0.072 248.1)
-
Step 400
400
#63A6E5
oklch(70.7% 0.115 248.4)
-
Step 500
500
#308EDD
oklch(63% 0.147 248.3)
-
Step 600
600 (this color)
#0181D6
oklch(59% 0.159 248.2)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#094471
oklch(37.7% 0.095 248)
-
Step 950
950
#092842
oklch(26.9% 0.06 247.8)
#0181D6 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) | #5686D9 | 0.053 |
| Deuteranopia (no green cones) | #3576D4 | 0.032 |
| Tritanopia (no blue cones) | #0096A1 | 0.114 |
| Achromatopsia (no color) | #7D7D7D | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0181D6
#0181D6
oklch(59% 0.159 248.2)
- #AE6C00
#AE6C00
oklch(58.9% 0.129 68.4)
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 #0181D6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.025
- Windows Blue #3778BF ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.054
- Cool Blue #4984B8 ΔE 0.059
- Nice Blue #107AB0 ΔE 0.059
- Steel Blue #4682B4 ΔE 0.060
- Cerulean Blue #056EEE ΔE 0.065
- Clear Blue #247AFD ΔE 0.065
Use #0181D6 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.