#4290CE
Closest named color: Dark Sky Blue (#448EE4). oklch(63.2% 0.121 245.4), rgb(66, 144, 206).
Aa
Black text reads best on this color (6.11:1).
About this color
#4290CE is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.121 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.035 away. Black text reads best on it, at 6.11:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.11:1 |
| White text | 3.43:1 |
Values
| HEX | #4290CE |
| RGB | rgb(66, 144, 206) |
| HSL | hsl(207, 59%, 53%) |
| OKLCH | oklch(63.2% 0.121 245.4) |
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 #4290CE | 3.43:1 | AA large text | Lc -67.1 | Content text, not long reading |
| Black text on #4290CE | 6.11:1 | AA | Lc 42.5 | Non-text elements, placeholder text |
| #4290CE text on white | 3.43:1 | AA large text | Lc 61.6 | Content text, not long reading |
| #4290CE text on black | 6.11:1 | AA | Lc -40.1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEE
oklch(88.5% 0.033 245.3)
-
Step 300
300
#A2C5E5
oklch(80.9% 0.059 246.2)
-
Step 400
400
#6DA7D8
oklch(70.8% 0.094 245.2)
-
Step 500
500 (this color)
#4290CE
oklch(63.2% 0.121 245.4)
-
Step 600
600
#1A79BB
oklch(55.7% 0.132 245.4)
-
Step 700
700
#0665A1
oklch(49% 0.123 245.6)
-
Step 800
800
#0E5382
oklch(42.7% 0.101 245.1)
-
Step 900
900
#164569
oklch(37.8% 0.079 245.5)
-
Step 950
950
#0F293D
oklch(27.1% 0.049 244.3)
#4290CE 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) | #7492D1 | 0.052 |
| Deuteranopia (no green cones) | #6184CD | 0.040 |
| Tritanopia (no blue cones) | #009FA6 | 0.089 |
| Achromatopsia (no color) | #8A8A8A | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4290CE
#4290CE
oklch(63.2% 0.121 245.4)
- #BB792D
#BB792D
oklch(63.2% 0.121 65.7)
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 #4290CE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.035
- Water Blue #0E87CC ΔE 0.039
- Faded Blue #658CBB ΔE 0.040
- Cool Blue #4984B8 ΔE 0.041
- Steel Blue #4682B4 ΔE 0.049
- Chefchaouen Blue #4895EF ΔE 0.050
- Off Blue #5684AE ΔE 0.052
- Dusty Blue #5A86AD ΔE 0.052
Use #4290CE 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.