#6597EF
Closest named color: Cornflower Blue (#6495ED). oklch(68% 0.141 261), rgb(101, 151, 239).
Aa
Black text reads best on this color (7.22:1).
About this color
#6597EF is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.141 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.006 away. Black text reads best on it, at 7.22:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.22:1 |
| White text | 2.90:1 |
Values
| HEX | #6597EF |
| RGB | rgb(101, 151, 239) |
| HSL | hsl(218, 81%, 67%) |
| OKLCH | oklch(68% 0.141 261) |
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 #6597EF | 2.90:1 | Fails | Lc -60.5 | Content text, not long reading |
| Black text on #6597EF | 7.22:1 | AAA | Lc 48.8 | Large or bold text, headings |
| #6597EF text on white | 2.90:1 | Fails | Lc 55.2 | Large or bold text, headings |
| #6597EF text on black | 7.22:1 | AAA | Lc -46.6 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A0C2FA
oklch(80.9% 0.088 260.2)
-
Step 400
400 (this color)
#6597EF
oklch(68% 0.141 261)
-
Step 500
500
#4684F5
oklch(63% 0.181 261.2)
-
Step 600
600
#276BE4
oklch(55.7% 0.196 261)
-
Step 700
700
#1A58C6
oklch(49.1% 0.183 261)
-
Step 800
800
#1849A0
oklch(42.8% 0.151 261)
-
Step 900
900
#1A3E7F
oklch(37.7% 0.118 261.1)
-
Step 950
950
#10254A
oklch(27% 0.074 260.8)
#6597EF 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) | #729EF3 | 0.025 |
| Deuteranopia (no green cones) | #6092ED | 0.015 |
| Tritanopia (no blue cones) | #00ABB8 | 0.124 |
| Achromatopsia (no color) | #979797 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6597EF
#6597EF
oklch(68% 0.141 261)
- #C48D00
#C48D00
oklch(67.9% 0.14 80.8)
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 #6597EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.006
- Chefchaouen Blue #4895EF ΔE 0.028
- Soft Blue #6488EA ΔE 0.039
- Dark Sky Blue #448EE4 ΔE 0.044
- Periwinkle Blue #8F99FB ΔE 0.055
- Perrywinkle #8F8CE7 ΔE 0.055
- Lavender Blue #8B88F8 ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.061
Use #6597EF 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.