#6591EF
Closest named color: Cornflower Blue (#6495ED). oklch(66.8% 0.148 263.9), rgb(101, 145, 239).
Aa
Black text reads best on this color (6.84:1).
About this color
#6591EF is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.148 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.012 away. Black text reads best on it, at 6.84:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.84:1 |
| White text | 3.06:1 |
Values
| HEX | #6591EF |
| RGB | rgb(101, 145, 239) |
| HSL | hsl(221, 81%, 67%) |
| OKLCH | oklch(66.8% 0.148 263.9) |
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 #6591EF | 3.06:1 | AA large text | Lc -62.7 | Content text, not long reading |
| Black text on #6591EF | 6.84:1 | AA | Lc 46.7 | Large or bold text, headings |
| #6591EF text on white | 3.06:1 | AA large text | Lc 57.3 | Large or bold text, headings |
| #6591EF text on black | 6.84:1 | AA | Lc -44.4 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF5
oklch(88.6% 0.04 263.7)
-
Step 300
300
#A9C1F0
oklch(80.9% 0.072 263.7)
-
Step 400
400
#7B9FE9
oklch(70.6% 0.116 263.9)
-
Step 500
500 (this color)
#6591EF
oklch(66.8% 0.148 263.9)
-
Step 600
600
#416DD0
oklch(55.6% 0.161 263.9)
-
Step 700
700
#335AB4
oklch(49% 0.15 264)
-
Step 800
800
#2B4A92
oklch(42.6% 0.124 264.3)
-
Step 900
900
#263F74
oklch(37.7% 0.096 263.5)
-
Step 950
950
#172544
oklch(27% 0.061 264.4)
#6591EF 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) | #699AF3 | 0.025 |
| Deuteranopia (no green cones) | #578DED | 0.019 |
| Tritanopia (no blue cones) | #00A6B4 | 0.131 |
| Achromatopsia (no color) | #939393 | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6591EF
#6591EF
oklch(66.8% 0.148 263.9)
- #BC8C00
#BC8C00
oklch(66.8% 0.137 84.1)
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 #6591EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.012
- Soft Blue #6488EA ΔE 0.024
- Chefchaouen Blue #4895EF ΔE 0.027
- Dark Sky Blue #448EE4 ΔE 0.038
- Perrywinkle #8F8CE7 ΔE 0.053
- Lavender Blue #8B88F8 ΔE 0.053
- Dodger Blue #1E90FF ΔE 0.055
- Periwinkle Blue #8F99FB ΔE 0.060
Use #6591EF 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.