#4099E2
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.3% 0.138 246.7), rgb(64, 153, 226).
Aa
Black text reads best on this color (6.87:1).
About this color
#4099E2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.138 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.025 away. Black text reads best on it, at 6.87:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.87:1 |
| White text | 3.05:1 |
Values
| HEX | #4099E2 |
| RGB | rgb(64, 153, 226) |
| HSL | hsl(207, 74%, 57%) |
| OKLCH | oklch(66.3% 0.138 246.7) |
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 #4099E2 | 3.05:1 | AA large text | Lc -62.4 | Content text, not long reading |
| Black text on #4099E2 | 6.87:1 | AA | Lc 47.0 | Large or bold text, headings |
| #4099E2 text on white | 3.05:1 | AA large text | Lc 57.1 | Large or bold text, headings |
| #4099E2 text on black | 6.87:1 | AA | Lc -44.7 | 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
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF1
oklch(88.5% 0.037 247)
-
Step 300
300
#9EC5EA
oklch(80.8% 0.067 247.3)
-
Step 400
400
#66A7E0
oklch(70.8% 0.107 246.5)
-
Step 500
500 (this color)
#4099E2
oklch(66.3% 0.138 246.7)
-
Step 600
600
#0078C3
oklch(55.7% 0.146 246.8)
-
Step 700
700
#0065A5
oklch(49.2% 0.128 246.7)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#0D446E
oklch(37.6% 0.09 247.1)
-
Step 950
950
#0B2840
oklch(26.9% 0.056 247)
#4099E2 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) | #789CE5 | 0.055 |
| Deuteranopia (no green cones) | #618DE1 | 0.039 |
| Tritanopia (no blue cones) | #00ABB3 | 0.102 |
| Achromatopsia (no color) | #939393 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4099E2
#4099E2
oklch(66.3% 0.138 246.7)
- #CA801E
#CA801E
oklch(66.3% 0.137 67)
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 #4099E2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.025
- Dark Sky Blue #448EE4 ΔE 0.031
- Cornflower Blue #6495ED ΔE 0.038
- Soft Blue #6488EA ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.056
- Faded Blue #658CBB ΔE 0.064
- Water Blue #0E87CC ΔE 0.065
- Cool Blue #4984B8 ΔE 0.076
Use #4099E2 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.