#258DDA
Closest named color: Dark Sky Blue (#448EE4). oklch(62.4% 0.147 246.4), rgb(37, 141, 218).
Aa
Black text reads best on this color (5.90:1).
About this color
#258DDA is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.147 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.026 away. Black text reads best on it, at 5.90:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.90:1 |
| White text | 3.55:1 |
Values
| HEX | #258DDA |
| RGB | rgb(37, 141, 218) |
| HSL | hsl(206, 71%, 50%) |
| OKLCH | oklch(62.4% 0.147 246.4) |
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 #258DDA | 3.55:1 | AA large text | Lc -68.2 | Content text, not long reading |
| Black text on #258DDA | 5.90:1 | AA | Lc 41.4 | Non-text elements, placeholder text |
| #258DDA text on white | 3.55:1 | AA large text | Lc 62.7 | Content text, not long reading |
| #258DDA text on black | 5.90:1 | AA | Lc -39.0 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C5DCF3
oklch(88.5% 0.04 248.3)
-
Step 300
300
#9BC6ED
oklch(80.9% 0.072 246.2)
-
Step 400
400
#60A7E4
oklch(70.7% 0.115 246.3)
-
Step 500
500 (this color)
#258DDA
oklch(62.4% 0.147 246.4)
-
Step 600
600
#0078C2
oklch(55.6% 0.145 246.5)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800
#005287
oklch(42.6% 0.111 246.5)
-
Step 900
900
#034471
oklch(37.6% 0.096 246.9)
-
Step 950
950
#072842
oklch(26.9% 0.061 246.8)
#258DDA 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) | #6891DD | 0.057 |
| Deuteranopia (no green cones) | #4E80D9 | 0.041 |
| Tritanopia (no blue cones) | #00A0A9 | 0.105 |
| Achromatopsia (no color) | #888888 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #258DDA
#258DDA
oklch(62.4% 0.147 246.4)
- #BE7300
#BE7300
oklch(62.3% 0.139 66.1)
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 #258DDA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.026
- Water Blue #0E87CC ΔE 0.028
- Chefchaouen Blue #4895EF ΔE 0.045
- Cool Blue #4984B8 ΔE 0.054
- Dodger Blue #1E90FF ΔE 0.055
- Soft Blue #6488EA ΔE 0.058
- Steel Blue #4682B4 ΔE 0.060
- Blue NCS #118AB2 ΔE 0.063
Use #258DDA 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.