#59B4DF
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.1% 0.107 231.2), rgb(89, 180, 223).
Aa
Black text reads best on this color (9.01:1).
About this color
#59B4DF is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.107 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.053 away. Black text reads best on it, at 9.01:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.01:1 |
| White text | 2.32:1 |
Values
| HEX | #59B4DF |
| RGB | rgb(89, 180, 223) |
| HSL | hsl(199, 68%, 61%) |
| OKLCH | oklch(73.1% 0.107 231.2) |
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 #59B4DF | 2.32:1 | Fails | Lc -50.6 | Large or bold text, headings |
| Black text on #59B4DF | 9.01:1 | AAA | Lc 58.3 | Large or bold text, headings |
| #59B4DF text on white | 2.32:1 | Fails | Lc 45.7 | Large or bold text, headings |
| #59B4DF text on black | 9.01:1 | AAA | Lc -56.4 | Large or bold text, headings |
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 400.
-
Step 50
50
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DEEDF5
oklch(93.7% 0.019 230.7)
-
Step 200
200
#C2DEEE
oklch(88.5% 0.037 232.9)
-
Step 300
300
#95C9E4
oklch(80.9% 0.066 231.2)
-
Step 400
400 (this color)
#59B4DF
oklch(73.1% 0.107 231.2)
-
Step 500
500
#0096C8
oklch(63.1% 0.127 231)
-
Step 600
600
#007EA9
oklch(55.6% 0.112 231.2)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#004862
oklch(37.7% 0.076 230.8)
-
Step 950
950
#002B3C
oklch(27.1% 0.054 230.4)
#59B4DF 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) | #9FB2E1 | 0.074 |
| Deuteranopia (no green cones) | #8CA4DE | 0.063 |
| Tritanopia (no blue cones) | #00C0C2 | 0.072 |
| Achromatopsia (no color) | #AAAAAA | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #59B4DF
#59B4DF
oklch(73.1% 0.107 231.2)
- #DE9468
#DE9468
oklch(73.1% 0.107 51.1)
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 #59B4DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.053
- Vivid Sky Blue #4CC9F0 ΔE 0.056
- Turquoise Blue #06B1C4 ΔE 0.058
- Bright Sky Blue #02CCFE ΔE 0.069
- Carolina Blue #8AB8FE ΔE 0.069
- Greyblue #77A1B5 ΔE 0.070
- Lightblue #7BC8F6 ΔE 0.070
- Bluegrey #85A3B2 ΔE 0.075
Use #59B4DF 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.