#6399EE
Closest named color: Cornflower Blue (#6495ED). oklch(68.3% 0.139 259.1), rgb(99, 153, 238).
Aa
Black text reads best on this color (7.32:1).
About this color
#6399EE is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.139 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.010 away. Black text reads best on it, at 7.32:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.32:1 |
| White text | 2.86:1 |
Values
| HEX | #6399EE |
| RGB | rgb(99, 153, 238) |
| HSL | hsl(217, 80%, 66%) |
| OKLCH | oklch(68.3% 0.139 259.1) |
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 #6399EE | 2.86:1 | Fails | Lc -60.0 | Large or bold text, headings |
| Black text on #6399EE | 7.32:1 | AAA | Lc 49.4 | Large or bold text, headings |
| #6399EE text on white | 2.86:1 | Fails | Lc 54.7 | Large or bold text, headings |
| #6399EE text on black | 7.32:1 | AAA | Lc -47.1 | 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 400.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9FC2F9
oklch(80.8% 0.087 259.3)
-
Step 400
400 (this color)
#6399EE
oklch(68.3% 0.139 259.1)
-
Step 500
500
#4186F2
oklch(63.1% 0.177 259.2)
-
Step 600
600
#1E6DE1
oklch(55.7% 0.192 259)
-
Step 700
700
#105AC4
oklch(49.2% 0.179 259.2)
-
Step 800
800
#114A9E
oklch(42.7% 0.148 259.1)
-
Step 900
900
#163F7E
oklch(37.7% 0.116 259.1)
-
Step 950
950
#0E254A
oklch(26.9% 0.075 259.5)
#6399EE 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) | #75A0F1 | 0.029 |
| Deuteranopia (no green cones) | #6393EC | 0.016 |
| Tritanopia (no blue cones) | #00ACB8 | 0.120 |
| Achromatopsia (no color) | #989898 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6399EE
#6399EE
oklch(68.3% 0.139 259.1)
- #C68D0F
#C68D0F
oklch(68.2% 0.139 79.2)
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 #6399EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.010
- Chefchaouen Blue #4895EF ΔE 0.028
- Soft Blue #6488EA ΔE 0.044
- Dark Sky Blue #448EE4 ΔE 0.046
- Periwinkle Blue #8F99FB ΔE 0.056
- Perrywinkle #8F8CE7 ΔE 0.058
- Dodger Blue #1E90FF ΔE 0.062
- Lavender Blue #8B88F8 ΔE 0.065
Use #6399EE 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.