#259DD0
Closest named color: Dark Sky Blue (#448EE4). oklch(65.6% 0.125 232.5), rgb(37, 157, 208).
Aa
Black text reads best on this color (6.81:1).
About this color
#259DD0 is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.125 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.058 away. Black text reads best on it, at 6.81:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.81:1 |
| White text | 3.08:1 |
Values
| HEX | #259DD0 |
| RGB | rgb(37, 157, 208) |
| HSL | hsl(198, 70%, 48%) |
| OKLCH | oklch(65.6% 0.125 232.5) |
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 #259DD0 | 3.08:1 | AA large text | Lc -62.7 | Content text, not long reading |
| Black text on #259DD0 | 6.81:1 | AA | Lc 46.8 | Large or bold text, headings |
| #259DD0 text on white | 3.08:1 | AA large text | Lc 57.3 | Large or bold text, headings |
| #259DD0 text on black | 6.81:1 | AA | Lc -44.5 | 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
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C4DEEC
oklch(88.6% 0.034 231.2)
-
Step 300
300
#99C8E2
oklch(80.8% 0.062 232.7)
-
Step 400
400
#5CABD3
oklch(70.7% 0.097 232.5)
-
Step 500
500 (this color)
#259DD0
oklch(65.6% 0.125 232.5)
-
Step 600
600
#007EAA
oklch(55.7% 0.113 231.8)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#042A3B
oklch(26.9% 0.052 232.8)
#259DD0 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) | #839BD2 | 0.080 |
| Deuteranopia (no green cones) | #6D8CCF | 0.067 |
| Tritanopia (no blue cones) | #00ABAE | 0.075 |
| Achromatopsia (no color) | #939393 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #259DD0
#259DD0
oklch(65.6% 0.125 232.5)
- #CC7942
#CC7942
oklch(65.6% 0.125 52.3)
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 #259DD0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.058
- Chefchaouen Blue #4895EF ΔE 0.060
- Faded Blue #658CBB ΔE 0.061
- Water Blue #0E87CC ΔE 0.064
- Turquoise Blue #06B1C4 ΔE 0.065
- Blue NCS #118AB2 ΔE 0.066
- Cool Blue #4984B8 ΔE 0.070
- Cornflower Blue #6495ED ΔE 0.071
Use #259DD0 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.