#4399EB
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.8% 0.147 250.1), rgb(67, 153, 235).
Aa
Black text reads best on this color (6.99:1).
About this color
#4399EB is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.147 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.014 away. Black text reads best on it, at 6.99:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.99:1 |
| White text | 3.00:1 |
Values
| HEX | #4399EB |
| RGB | rgb(67, 153, 235) |
| HSL | hsl(209, 81%, 59%) |
| OKLCH | oklch(66.8% 0.147 250.1) |
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 #4399EB | 3.00:1 | AA large text | Lc -61.7 | Content text, not long reading |
| Black text on #4399EB | 6.99:1 | AA | Lc 47.7 | Large or bold text, headings |
| #4399EB text on white | 3.00:1 | AA large text | Lc 56.4 | Large or bold text, headings |
| #4399EB text on black | 6.99:1 | AA | Lc -45.4 | Large or bold text, headings |
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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF3
oklch(88.5% 0.04 249.5)
-
Step 300
300
#9EC5EE
oklch(81% 0.072 250)
-
Step 400
400
#66A5E6
oklch(70.6% 0.116 250.5)
-
Step 500
500 (this color)
#4399EB
oklch(66.8% 0.147 250.1)
-
Step 600
600
#0076CB
oklch(55.7% 0.158 250)
-
Step 700
700
#0063AC
oklch(49.2% 0.139 250)
-
Step 800
800
#00518E
oklch(42.8% 0.121 249.9)
-
Step 900
900
#0E4372
oklch(37.6% 0.096 250.3)
-
Step 950
950
#0B2843
oklch(27.1% 0.061 249.8)
#4399EB 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) | #749DEE | 0.049 |
| Deuteranopia (no green cones) | #5B8EE9 | 0.032 |
| Tritanopia (no blue cones) | #00ACB7 | 0.110 |
| Achromatopsia (no color) | #959595 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4399EB
#4399EB
oklch(66.8% 0.147 250.1)
- #CC8200
#CC8200
oklch(66.8% 0.145 70)
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 #4399EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.014
- Cornflower Blue #6495ED ΔE 0.030
- Dark Sky Blue #448EE4 ΔE 0.030
- Dodger Blue #1E90FF ΔE 0.047
- Soft Blue #6488EA ΔE 0.050
- Water Blue #0E87CC ΔE 0.073
- Faded Blue #658CBB ΔE 0.075
- Perrywinkle #8F8CE7 ΔE 0.083
Use #4399EB 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.