#6591CB
Closest named color: Faded Blue (#658CBB). oklch(64.9% 0.1 255.7), rgb(101, 145, 203).
Aa
Black text reads best on this color (6.46:1).
About this color
#6591CB is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.100 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.025 away. Black text reads best on it, at 6.46:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.46:1 |
| White text | 3.24:1 |
Values
| HEX | #6591CB |
| RGB | rgb(101, 145, 203) |
| HSL | hsl(214, 50%, 60%) |
| OKLCH | oklch(64.9% 0.1 255.7) |
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 #6591CB | 3.24:1 | AA large text | Lc -65.1 | Content text, not long reading |
| Black text on #6591CB | 6.46:1 | AA | Lc 44.4 | Non-text elements, placeholder text |
| #6591CB text on white | 3.24:1 | AA large text | Lc 59.7 | Large or bold text, headings |
| #6591CB text on black | 6.46:1 | AA | Lc -42.1 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CEDAEB
oklch(88.4% 0.027 257)
-
Step 300
300
#ACC3E0
oklch(80.9% 0.048 254.3)
-
Step 400
400
#80A3D1
oklch(70.7% 0.078 255.5)
-
Step 500
500 (this color)
#6591CB
oklch(64.9% 0.1 255.7)
-
Step 600
600
#4675B2
oklch(55.7% 0.109 255.6)
-
Step 700
700
#376299
oklch(49.2% 0.101 255.4)
-
Step 800
800
#2E507C
oklch(42.7% 0.084 255.5)
-
Step 900
900
#294364
oklch(37.8% 0.065 255)
-
Step 950
950
#19273A
oklch(27% 0.041 256.3)
#6591CB 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) | #7A94CE | 0.028 |
| Deuteranopia (no green cones) | #6E8ACA | 0.020 |
| Tritanopia (no blue cones) | #349EA5 | 0.089 |
| Achromatopsia (no color) | #8F8F8F | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6591CB
#6591CB
oklch(64.9% 0.1 255.7)
- #B28643
#B28643
oklch(64.9% 0.1 75.8)
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 #6591CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.025
- Dark Sky Blue #448EE4 ΔE 0.050
- Cornflower Blue #6495ED ΔE 0.050
- Silver Lake Blue #778DA9 ΔE 0.052
- Dusty Blue #5A86AD ΔE 0.053
- Cool Blue #4984B8 ΔE 0.055
- Off Blue #5684AE ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.057
Use #6591CB 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.