#6399FB
Closest named color: Cornflower Blue (#6495ED). oklch(69% 0.156 261.4), rgb(99, 153, 251).
Aa
Black text reads best on this color (7.48:1).
About this color
#6399FB is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.156 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.021 away. Black text reads best on it, at 7.48:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.48:1 |
| White text | 2.80:1 |
Values
| HEX | #6399FB |
| RGB | rgb(99, 153, 251) |
| HSL | hsl(219, 95%, 69%) |
| OKLCH | oklch(69% 0.156 261.4) |
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 #6399FB | 2.80:1 | Fails | Lc -59.0 | Large or bold text, headings |
| Black text on #6399FB | 7.48:1 | AAA | Lc 50.3 | Large or bold text, headings |
| #6399FB text on white | 2.80:1 | Fails | Lc 53.8 | Large or bold text, headings |
| #6399FB text on black | 7.48:1 | AAA | Lc -48.1 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EBFD
oklch(93.7% 0.027 260.3)
-
Step 200
200
#C6DAFE
oklch(88.5% 0.054 262.2)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400 (this color)
#6399FB
oklch(69% 0.156 261.4)
-
Step 500
500
#3F82FF
oklch(63.1% 0.198 261.5)
-
Step 600
600
#1D67EF
oklch(55.5% 0.217 261.4)
-
Step 700
700
#1055D0
oklch(49.2% 0.201 261.4)
-
Step 800
800
#1146A8
oklch(42.6% 0.167 261.5)
-
Step 900
900
#153C85
oklch(37.6% 0.131 261.5)
-
Step 950
950
#0E244E
oklch(27% 0.082 261.8)
#6399FB 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) | #6EA2FF | 0.028 |
| Deuteranopia (no green cones) | #5994F9 | 0.018 |
| Tritanopia (no blue cones) | #00AFBE | 0.132 |
| Achromatopsia (no color) | #9A9A9A | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6399FB
#6399FB
oklch(69% 0.156 261.4)
- #C89100
#C89100
oklch(69.2% 0.143 81.5)
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 #6399FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.021
- Chefchaouen Blue #4895EF ΔE 0.033
- Soft Blue #6488EA ΔE 0.047
- Periwinkle Blue #8F99FB ΔE 0.052
- Dark Sky Blue #448EE4 ΔE 0.054
- Dodger Blue #1E90FF ΔE 0.057
- Lavender Blue #8B88F8 ΔE 0.059
- Perrywinkle #8F8CE7 ΔE 0.061
Use #6399FB 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.