#6591FC
Closest named color: Cornflower Blue (#6495ED). oklch(67.5% 0.166 265.4), rgb(101, 145, 252).
Aa
Black text reads best on this color (7.00:1).
About this color
#6591FC is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.166 and its hue 265°. 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 7.00:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.00:1 |
| White text | 2.99:1 |
Values
| HEX | #6591FC |
| RGB | rgb(101, 145, 252) |
| HSL | hsl(223, 96%, 69%) |
| OKLCH | oklch(67.5% 0.166 265.4) |
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 #6591FC | 2.99:1 | Fails | Lc -61.7 | Content text, not long reading |
| Black text on #6591FC | 7.00:1 | AAA | Lc 47.7 | Large or bold text, headings |
| #6591FC text on white | 2.99:1 | Fails | Lc 56.4 | Large or bold text, headings |
| #6591FC text on black | 7.00:1 | AAA | Lc -45.4 | Large or bold text, headings |
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 400.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400 (this color)
#6591FC
oklch(67.5% 0.166 265.4)
-
Step 500
500
#4E7FFF
oklch(63% 0.198 265.3)
-
Step 600
600
#3061F7
oklch(55.6% 0.23 265.4)
-
Step 700
700
#244FD7
oklch(49.1% 0.213 265.3)
-
Step 800
800
#1F42AE
oklch(42.8% 0.177 265.4)
-
Step 900
900
#1D3989
oklch(37.6% 0.138 265.5)
-
Step 950
950
#112350
oklch(27.1% 0.086 264.8)
#6591FC 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) | #619CFF | 0.028 |
| Deuteranopia (no green cones) | #4B8FFA | 0.026 |
| Tritanopia (no blue cones) | #00A9BA | 0.143 |
| Achromatopsia (no color) | #959595 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6591FC
#6591FC
oklch(67.5% 0.166 265.4)
- #BD8F00
#BD8F00
oklch(67.5% 0.138 85.6)
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 #6591FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.027
- Soft Blue #6488EA ΔE 0.033
- Chefchaouen Blue #4895EF ΔE 0.036
- Lavender Blue #8B88F8 ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.050
- Dodger Blue #1E90FF ΔE 0.051
- Periwinkle Blue #8F99FB ΔE 0.057
- Perrywinkle #8F8CE7 ΔE 0.058
Use #6591FC 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.