#6399DB
Closest named color: Cornflower Blue (#6495ED). oklch(67.3% 0.114 254.2), rgb(99, 153, 219).
Aa
Black text reads best on this color (7.10:1).
About this color
#6399DB is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.114 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.032 away. Black text reads best on it, at 7.10:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.10:1 |
| White text | 2.95:1 |
Values
| HEX | #6399DB |
| RGB | rgb(99, 153, 219) |
| HSL | hsl(213, 62%, 62%) |
| OKLCH | oklch(67.3% 0.114 254.2) |
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 #6399DB | 2.95:1 | Fails | Lc -61.2 | Content text, not long reading |
| Black text on #6399DB | 7.10:1 | AAA | Lc 48.1 | Large or bold text, headings |
| #6399DB text on white | 2.95:1 | Fails | Lc 55.9 | Large or bold text, headings |
| #6399DB text on black | 7.10:1 | AAA | Lc -45.9 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF3
oklch(88.5% 0.039 254.3)
-
Step 300
300
#A1C4EE
oklch(80.9% 0.071 253.2)
-
Step 400
400 (this color)
#6399DB
oklch(67.3% 0.114 254.2)
-
Step 500
500
#448BDF
oklch(63.1% 0.146 254.3)
-
Step 600
600
#2073CD
oklch(55.6% 0.159 254.2)
-
Step 700
700
#1160B1
oklch(49.1% 0.147 254.1)
-
Step 800
800
#134F8F
oklch(42.7% 0.121 253.9)
-
Step 900
900
#184272
oklch(37.7% 0.095 254)
-
Step 950
950
#0F2743
oklch(27% 0.06 253.9)
#6399DB 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) | #7E9DDE | 0.034 |
| Deuteranopia (no green cones) | #6F91DA | 0.023 |
| Tritanopia (no blue cones) | #11A8B0 | 0.101 |
| Achromatopsia (no color) | #969696 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6399DB
#6399DB
oklch(67.3% 0.114 254.2)
- #C08B3C
#C08B3C
oklch(67.4% 0.115 74.3)
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 #6399DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.032
- Chefchaouen Blue #4895EF ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.048
- Faded Blue #658CBB ΔE 0.053
- Soft Blue #6488EA ΔE 0.055
- Perrywinkle #8F8CE7 ΔE 0.066
- Greyblue #77A1B5 ΔE 0.070
- Periwinkle Blue #8F99FB ΔE 0.073
Use #6399DB 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.