#4090CB
Closest named color: Water Blue (#0E87CC). oklch(63% 0.118 243.7), rgb(64, 144, 203).
Aa
Black text reads best on this color (6.06:1).
About this color
#4090CB is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.118 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.039 away. Black text reads best on it, at 6.06:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 6.06:1 |
| White text | 3.45:1 |
Values
| HEX | #4090CB |
| RGB | rgb(64, 144, 203) |
| HSL | hsl(205, 57%, 52%) |
| OKLCH | oklch(63% 0.118 243.7) |
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 #4090CB | 3.45:1 | AA large text | Lc -67.3 | Content text, not long reading |
| Black text on #4090CB | 6.06:1 | AA | Lc 42.2 | Non-text elements, placeholder text |
| #4090CB text on white | 3.45:1 | AA large text | Lc 61.9 | Content text, not long reading |
| #4090CB text on black | 6.06:1 | AA | Lc -39.8 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C8DCED
oklch(88.5% 0.032 243.7)
-
Step 300
300
#A1C6E4
oklch(81% 0.058 243)
-
Step 400
400
#6CA7D6
oklch(70.6% 0.093 243.7)
-
Step 500
500 (this color)
#4090CB
oklch(63% 0.118 243.7)
-
Step 600
600
#1679B8
oklch(55.5% 0.129 243.8)
-
Step 700
700
#02669F
oklch(49.1% 0.12 243.8)
-
Step 800
800
#0C5381
oklch(42.6% 0.1 244.3)
-
Step 900
900
#154567
oklch(37.6% 0.077 243.7)
-
Step 950
950
#0E293C
oklch(27% 0.048 242.2)
#4090CB 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) | #7591CE | 0.054 |
| Deuteranopia (no green cones) | #6284CA | 0.042 |
| Tritanopia (no blue cones) | #009EA5 | 0.084 |
| Achromatopsia (no color) | #8A8A8A | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4090CB
#4090CB
oklch(63% 0.118 243.7)
- #BA7832
#BA7832
oklch(63% 0.118 64)
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 #4090CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.039
- Cool Blue #4984B8 ΔE 0.039
- Faded Blue #658CBB ΔE 0.039
- Dark Sky Blue #448EE4 ΔE 0.040
- Steel Blue #4682B4 ΔE 0.046
- Off Blue #5684AE ΔE 0.049
- Dusty Blue #5A86AD ΔE 0.049
- Blue NCS #118AB2 ΔE 0.049
Use #4090CB 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.