#159ED3
Closest named color: Dark Sky Blue (#448EE4). oklch(65.8% 0.13 232.1), rgb(21, 158, 211).
Aa
Black text reads best on this color (6.86:1).
About this color
#159ED3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.130 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.059 away. Black text reads best on it, at 6.86:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.86:1 |
| White text | 3.05:1 |
Values
| HEX | #159ED3 |
| RGB | rgb(21, 158, 211) |
| HSL | hsl(197, 82%, 45%) |
| OKLCH | oklch(65.8% 0.13 232.1) |
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 #159ED3 | 3.05:1 | AA large text | Lc -62.3 | Content text, not long reading |
| Black text on #159ED3 | 6.86:1 | AA | Lc 47.1 | Large or bold text, headings |
| #159ED3 text on white | 3.05:1 | AA large text | Lc 56.9 | Large or bold text, headings |
| #159ED3 text on black | 6.86:1 | AA | Lc -44.9 | 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
#DEECF4
oklch(93.5% 0.018 232.5)
-
Step 200
200
#C3DEED
oklch(88.5% 0.035 232.1)
-
Step 300
300
#97C9E3
oklch(81% 0.064 231.2)
-
Step 400
400
#57ACD5
oklch(70.8% 0.102 231.6)
-
Step 500
500 (this color)
#159ED3
oklch(65.8% 0.13 232.1)
-
Step 600
600
#007EAA
oklch(55.7% 0.113 231.8)
-
Step 700
700
#006A90
oklch(49.2% 0.1 232)
-
Step 800
800
#005676
oklch(42.6% 0.087 232.3)
-
Step 900
900
#004863
oklch(37.7% 0.077 231.8)
-
Step 950
950
#012B3C
oklch(27.1% 0.054 230.9)
#159ED3 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) | #839CD5 | 0.084 |
| Deuteranopia (no green cones) | #6C8CD2 | 0.071 |
| Tritanopia (no blue cones) | #00ACB0 | 0.076 |
| Achromatopsia (no color) | #939393 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #159ED3
#159ED3
oklch(65.8% 0.13 232.1)
- #CF783E
#CF783E
oklch(65.8% 0.131 52.1)
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 #159ED3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.059
- Chefchaouen Blue #4895EF ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.065
- Water Blue #0E87CC ΔE 0.065
- Faded Blue #658CBB ΔE 0.067
- Blue NCS #118AB2 ΔE 0.068
- Cornflower Blue #6495ED ΔE 0.071
- Cool Blue #4984B8 ΔE 0.074
Use #159ED3 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.