#6591BB
Closest named color: Faded Blue (#658CBB). oklch(64.1% 0.08 248), rgb(101, 145, 187).
Aa
Black text reads best on this color (6.32:1).
About this color
#6591BB is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.080 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.014 away. Black text reads best on it, at 6.32:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.32:1 |
| White text | 3.32:1 |
Values
| HEX | #6591BB |
| RGB | rgb(101, 145, 187) |
| HSL | hsl(209, 39%, 56%) |
| OKLCH | oklch(64.1% 0.08 248) |
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 #6591BB | 3.32:1 | AA large text | Lc -66.0 | Content text, not long reading |
| Black text on #6591BB | 6.32:1 | AA | Lc 43.5 | Non-text elements, placeholder text |
| #6591BB text on white | 3.32:1 | AA large text | Lc 60.5 | Content text, not long reading |
| #6591BB text on black | 6.32:1 | AA | Lc -41.2 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE7
oklch(88.5% 0.022 245.9)
-
Step 300
300
#AEC3D9
oklch(80.8% 0.039 249.5)
-
Step 400
400
#82A5C6
oklch(70.8% 0.062 247.2)
-
Step 500
500 (this color)
#6591BB
oklch(64.1% 0.08 248)
-
Step 600
600
#4877A4
oklch(55.5% 0.087 248.7)
-
Step 700
700
#39648C
oklch(49% 0.081 248.1)
-
Step 800
800
#305272
oklch(42.7% 0.067 248.2)
-
Step 900
900
#2B445C
oklch(37.7% 0.052 248.4)
-
Step 950
950
#192836
oklch(27% 0.033 247.4)
#6591BB 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) | #8092BD | 0.034 |
| Deuteranopia (no green cones) | #7589BA | 0.027 |
| Tritanopia (no blue cones) | #419B9F | 0.068 |
| Achromatopsia (no color) | #8D8D8D | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6591BB
#6591BB
oklch(64.1% 0.08 248)
- #AD8356
#AD8356
oklch(64% 0.08 67.5)
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 #6591BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.014
- Silver Lake Blue #778DA9 ΔE 0.032
- Blue Grey #758DA3 ΔE 0.038
- Dusty Blue #5A86AD ΔE 0.038
- Off Blue #5684AE ΔE 0.044
- Cool Blue #4984B8 ΔE 0.050
- Light Slate Gray #778899 ΔE 0.052
- Greyblue #77A1B5 ΔE 0.055
Use #6591BB 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.