#4577BD
Closest named color: Windows Blue (#3778BF). oklch(56.7% 0.122 257.1), rgb(69, 119, 189).
Aa
Black text reads best on this color (4.62:1).
About this color
#4577BD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.122 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.012 away. Black text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.62:1 |
| White text | 4.53:1 |
Values
| HEX | #4577BD |
| RGB | rgb(69, 119, 189) |
| HSL | hsl(215, 48%, 51%) |
| OKLCH | oklch(56.7% 0.122 257.1) |
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 #4577BD | 4.53:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #4577BD | 4.62:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #4577BD text on white | 4.53:1 | AA | Lc 71.3 | Content text, not long reading |
| #4577BD text on black | 4.62:1 | AA | Lc -30.4 | 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 600.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ABC2E4
oklch(80.8% 0.054 258)
-
Step 400
400
#7DA3D7
oklch(70.8% 0.087 256.4)
-
Step 500
500
#5C8BCC
oklch(63.1% 0.111 256.7)
-
Step 600
600 (this color)
#4577BD
oklch(56.7% 0.122 257.1)
-
Step 700
700
#3361A0
oklch(49.2% 0.113 256.8)
-
Step 800
800
#2B4F81
oklch(42.6% 0.093 257)
-
Step 900
900
#274268
oklch(37.7% 0.073 257.1)
-
Step 950
950
#17273D
oklch(27% 0.047 256.6)
#4577BD 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) | #597CC0 | 0.028 |
| Deuteranopia (no green cones) | #4871BC | 0.016 |
| Tritanopia (no blue cones) | #008791 | 0.100 |
| Achromatopsia (no color) | #767676 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4577BD
#4577BD
oklch(56.7% 0.122 257.1)
- #9D6C00
#9D6C00
oklch(56.8% 0.119 77.4)
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 #4577BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.012
- Flat Blue #3C73A8 ΔE 0.035
- Steel Blue #4682B4 ΔE 0.037
- French Blue #436BAD ΔE 0.039
- Cool Blue #4984B8 ΔE 0.040
- Nice Blue #107AB0 ΔE 0.041
- Water Blue #0E87CC ΔE 0.049
- Mid Blue #276AB3 ΔE 0.049
Use #4577BD 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.