#4591DD
Closest named color: Dark Sky Blue (#448EE4). oklch(64.4% 0.137 250.8), rgb(69, 145, 221).
Aa
Black text reads best on this color (6.34:1).
About this color
#4591DD is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.137 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.015 away. Black text reads best on it, at 6.34:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.34:1 |
| White text | 3.30:1 |
Values
| HEX | #4591DD |
| RGB | rgb(69, 145, 221) |
| HSL | hsl(210, 69%, 57%) |
| OKLCH | oklch(64.4% 0.137 250.8) |
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 #4591DD | 3.30:1 | AA large text | Lc -65.6 | Content text, not long reading |
| Black text on #4591DD | 6.34:1 | AA | Lc 43.9 | Non-text elements, placeholder text |
| #4591DD text on white | 3.30:1 | AA large text | Lc 60.2 | Content text, not long reading |
| #4591DD text on black | 6.34:1 | AA | Lc -41.5 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DCF2
oklch(88.6% 0.037 250.8)
-
Step 300
300
#A1C4EB
oklch(80.8% 0.067 251.4)
-
Step 400
400
#6CA5E1
oklch(70.7% 0.107 250.7)
-
Step 500
500 (this color)
#4591DD
oklch(64.4% 0.137 250.8)
-
Step 600
600
#1A76C6
oklch(55.7% 0.148 250.5)
-
Step 700
700
#0862AB
oklch(49% 0.138 250.9)
-
Step 800
800
#0E518B
oklch(42.8% 0.114 250.6)
-
Step 900
900
#16436F
oklch(37.6% 0.09 251.1)
-
Step 950
950
#0F2841
oklch(27.1% 0.056 250.6)
#4591DD 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) | #6F95E0 | 0.044 |
| Deuteranopia (no green cones) | #5987DB | 0.029 |
| Tritanopia (no blue cones) | #00A3AD | 0.104 |
| Achromatopsia (no color) | #8D8D8D | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4591DD
#4591DD
oklch(64.4% 0.137 250.8)
- #C17C08
#C17C08
oklch(64.3% 0.137 70.3)
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 #4591DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.015
- Chefchaouen Blue #4895EF ΔE 0.028
- Cornflower Blue #6495ED ΔE 0.040
- Soft Blue #6488EA ΔE 0.043
- Water Blue #0E87CC ΔE 0.049
- Dodger Blue #1E90FF ΔE 0.054
- Faded Blue #658CBB ΔE 0.055
- Cool Blue #4984B8 ΔE 0.060
Use #4591DD 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.