#6591DE
Closest named color: Cornflower Blue (#6495ED). oklch(65.9% 0.125 261), rgb(101, 145, 222).
Aa
Black text reads best on this color (6.65:1).
About this color
#6591DE is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.125 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.023 away. Black text reads best on it, at 6.65:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.65:1 |
| White text | 3.15:1 |
Values
| HEX | #6591DE |
| RGB | rgb(101, 145, 222) |
| HSL | hsl(218, 65%, 63%) |
| OKLCH | oklch(65.9% 0.125 261) |
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 #6591DE | 3.15:1 | AA large text | Lc -63.9 | Content text, not long reading |
| Black text on #6591DE | 6.65:1 | AA | Lc 45.6 | Large or bold text, headings |
| #6591DE text on white | 3.15:1 | AA large text | Lc 58.5 | Large or bold text, headings |
| #6591DE text on black | 6.65:1 | AA | Lc -43.3 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF0
oklch(88.5% 0.033 261)
-
Step 300
300
#ABC2E9
oklch(81% 0.061 261)
-
Step 400
400
#7EA1DE
oklch(70.7% 0.098 261.2)
-
Step 500
500 (this color)
#6591DE
oklch(65.9% 0.125 261)
-
Step 600
600
#4371C2
oklch(55.6% 0.136 260.9)
-
Step 700
700
#355EA8
oklch(49.1% 0.127 261.2)
-
Step 800
800
#2C4D88
oklch(42.7% 0.106 261.1)
-
Step 900
900
#28416D
oklch(37.8% 0.082 261)
-
Step 950
950
#182640
oklch(27% 0.052 262)
#6591DE 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) | #7297E1 | 0.023 |
| Deuteranopia (no green cones) | #638CDC | 0.014 |
| Tritanopia (no blue cones) | #1BA2AD | 0.112 |
| Achromatopsia (no color) | #919191 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6591DE
#6591DE
oklch(65.9% 0.125 261)
- #B98823
#B98823
oklch(65.8% 0.125 80.4)
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 #6591DE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.023
- Soft Blue #6488EA ΔE 0.033
- Chefchaouen Blue #4895EF ΔE 0.034
- Dark Sky Blue #448EE4 ΔE 0.034
- Faded Blue #658CBB ΔE 0.052
- Perrywinkle #8F8CE7 ΔE 0.056
- Lavender Blue #8B88F8 ΔE 0.068
- Dodger Blue #1E90FF ΔE 0.069
Use #6591DE 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.