#6597DC
Closest named color: Cornflower Blue (#6495ED). oklch(67% 0.116 256.7), rgb(101, 151, 220).
Aa
Black text reads best on this color (7.01:1).
About this color
#6597DC is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.116 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.027 away. Black text reads best on it, at 7.01:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.01:1 |
| White text | 2.99:1 |
Values
| HEX | #6597DC |
| RGB | rgb(101, 151, 220) |
| HSL | hsl(215, 63%, 63%) |
| OKLCH | oklch(67% 0.116 256.7) |
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 #6597DC | 2.99:1 | Fails | Lc -61.8 | Content text, not long reading |
| Black text on #6597DC | 7.01:1 | AAA | Lc 47.6 | Large or bold text, headings |
| #6597DC text on white | 2.99:1 | Fails | Lc 56.5 | Large or bold text, headings |
| #6597DC text on black | 7.01:1 | AAA | Lc -45.3 | 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
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A3C3F0
oklch(80.9% 0.073 256.9)
-
Step 400
400 (this color)
#6597DC
oklch(67% 0.116 256.7)
-
Step 500
500
#498AE1
oklch(63.2% 0.148 256.4)
-
Step 600
600
#2971CF
oklch(55.5% 0.162 256.8)
-
Step 700
700
#1B5EB4
oklch(49% 0.152 256.9)
-
Step 800
800
#194E91
oklch(42.8% 0.124 256.3)
-
Step 900
900
#1B4174
oklch(37.7% 0.098 256.7)
-
Step 950
950
#112744
oklch(27.1% 0.061 256.1)
#6597DC 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) | #7B9BDF | 0.029 |
| Deuteranopia (no green cones) | #6C90DB | 0.019 |
| Tritanopia (no blue cones) | #1CA6B0 | 0.102 |
| Achromatopsia (no color) | #959595 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6597DC
#6597DC
oklch(67% 0.116 256.7)
- #BD8B37
#BD8B37
oklch(67% 0.116 77.1)
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 #6597DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.027
- Chefchaouen Blue #4895EF ΔE 0.039
- Dark Sky Blue #448EE4 ΔE 0.045
- Soft Blue #6488EA ΔE 0.049
- Faded Blue #658CBB ΔE 0.052
- Perrywinkle #8F8CE7 ΔE 0.061
- Periwinkle Blue #8F99FB ΔE 0.071
- Greyblue #77A1B5 ΔE 0.074
Use #6597DC 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.