#6591DB
Closest named color: Cornflower Blue (#6495ED). oklch(65.7% 0.121 260.3), rgb(101, 145, 219).
Aa
Black text reads best on this color (6.62:1).
About this color
#6591DB is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.121 and its hue 260°. 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 6.62:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.62:1 |
| White text | 3.16:1 |
Values
| HEX | #6591DB |
| RGB | rgb(101, 145, 219) |
| HSL | hsl(218, 62%, 63%) |
| OKLCH | oklch(65.7% 0.121 260.3) |
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 #6591DB | 3.16:1 | AA large text | Lc -64.1 | Content text, not long reading |
| Black text on #6591DB | 6.62:1 | AA | Lc 45.4 | Large or bold text, headings |
| #6591DB text on white | 3.16:1 | AA large text | Lc 58.7 | Large or bold text, headings |
| #6591DB text on black | 6.62:1 | AA | Lc -43.1 | 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
#ABC2E8
oklch(81% 0.06 260.4)
-
Step 400
400
#7EA1DC
oklch(70.6% 0.095 260.6)
-
Step 500
500 (this color)
#6591DB
oklch(65.7% 0.121 260.3)
-
Step 600
600
#4472BF
oklch(55.7% 0.13 260.1)
-
Step 700
700
#355FA5
oklch(49.1% 0.122 260)
-
Step 800
800
#2D4E86
oklch(42.8% 0.101 260.3)
-
Step 900
900
#28416B
oklch(37.7% 0.079 260.2)
-
Step 950
950
#18263F
oklch(27% 0.051 261.4)
#6591DB 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) | #7397DE | 0.024 |
| Deuteranopia (no green cones) | #658CD9 | 0.013 |
| Tritanopia (no blue cones) | #21A1AC | 0.108 |
| Achromatopsia (no color) | #919191 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6591DB
#6591DB
oklch(65.7% 0.121 260.3)
- #B78829
#B78829
oklch(65.6% 0.121 80.6)
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 #6591DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.027
- Dark Sky Blue #448EE4 ΔE 0.036
- Soft Blue #6488EA ΔE 0.036
- Chefchaouen Blue #4895EF ΔE 0.037
- Faded Blue #658CBB ΔE 0.048
- Perrywinkle #8F8CE7 ΔE 0.058
- Cool Blue #4984B8 ΔE 0.069
- Lavender Blue #8B88F8 ΔE 0.071
Use #6591DB 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.