#159BD4
Closest named color: Dark Sky Blue (#448EE4). oklch(65.1% 0.133 234.6), rgb(21, 155, 212).
Aa
Black text reads best on this color (6.67:1).
About this color
#159BD4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.133 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.051 away. Black text reads best on it, at 6.67:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.67:1 |
| White text | 3.14:1 |
Values
| HEX | #159BD4 |
| RGB | rgb(21, 155, 212) |
| HSL | hsl(198, 82%, 46%) |
| OKLCH | oklch(65.1% 0.133 234.6) |
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 #159BD4 | 3.14:1 | AA large text | Lc -63.4 | Content text, not long reading |
| Black text on #159BD4 | 6.67:1 | AA | Lc 46.0 | Large or bold text, headings |
| #159BD4 text on white | 3.14:1 | AA large text | Lc 58.0 | Large or bold text, headings |
| #159BD4 text on black | 6.67:1 | AA | Lc -43.7 | 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 500.
-
Step 50
50
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DEECF5
oklch(93.5% 0.019 235.7)
-
Step 200
200
#C3DEEE
oklch(88.6% 0.036 233.8)
-
Step 300
300
#98C8E5
oklch(80.9% 0.065 235.2)
-
Step 400
400
#58ABD8
oklch(70.7% 0.104 234.6)
-
Step 500
500 (this color)
#159BD4
oklch(65.1% 0.133 234.6)
-
Step 600
600
#007DAD
oklch(55.6% 0.117 234.3)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#005679
oklch(42.8% 0.09 234.7)
-
Step 900
900
#004765
oklch(37.6% 0.08 234.9)
-
Step 950
950
#022A3D
oklch(26.9% 0.055 234.8)
#159BD4 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) | #7F9AD7 | 0.081 |
| Deuteranopia (no green cones) | #678AD3 | 0.066 |
| Tritanopia (no blue cones) | #00AAAF | 0.081 |
| Achromatopsia (no color) | #919191 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #159BD4
#159BD4
oklch(65.1% 0.133 234.6)
- #CC7736
#CC7736
oklch(65.1% 0.132 54.9)
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 #159BD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.051
- Chefchaouen Blue #4895EF ΔE 0.055
- Water Blue #0E87CC ΔE 0.056
- Blue NCS #118AB2 ΔE 0.064
- Faded Blue #658CBB ΔE 0.064
- Cornflower Blue #6495ED ΔE 0.068
- Cool Blue #4984B8 ΔE 0.068
- Turquoise Blue #06B1C4 ΔE 0.074
Use #159BD4 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.