#4573B1
Closest named color: Flat Blue (#3C73A8). oklch(55.1% 0.11 256.3), rgb(69, 115, 177).
Aa
White text reads best on this color (4.83:1).
About this color
#4573B1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.110 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.017 away. White text reads best on it, at 4.83:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.34:1 |
| White text | 4.83:1 |
Values
| HEX | #4573B1 |
| RGB | rgb(69, 115, 177) |
| HSL | hsl(214, 44%, 48%) |
| OKLCH | oklch(55.1% 0.11 256.3) |
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 #4573B1 | 4.83:1 | AA | Lc -78.8 | Fine for body text |
| Black text on #4573B1 | 4.34:1 | AA large text | Lc 30.7 | Non-text elements, placeholder text |
| #4573B1 text on white | 4.83:1 | AA | Lc 73.4 | Content text, not long reading |
| #4573B1 text on black | 4.34:1 | AA large text | Lc -28.3 | Dividers and decoration only |
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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAEC
oklch(88.5% 0.028 258.4)
-
Step 300
300
#ACC3E1
oklch(81% 0.049 255.1)
-
Step 400
400
#80A3D2
oklch(70.7% 0.079 255.9)
-
Step 500
500
#608BC6
oklch(63% 0.101 256.5)
-
Step 600
600 (this color)
#4573B1
oklch(55.1% 0.11 256.3)
-
Step 700
700
#38619A
oklch(49% 0.103 256.9)
-
Step 800
800
#2F507C
oklch(42.8% 0.083 256.1)
-
Step 900
900
#2A4264
oklch(37.6% 0.066 257.2)
-
Step 950
950
#19273B
oklch(27% 0.042 257.3)
#4573B1 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) | #5977B4 | 0.027 |
| Deuteranopia (no green cones) | #4A6DB0 | 0.017 |
| Tritanopia (no blue cones) | #00818A | 0.092 |
| Achromatopsia (no color) | #727272 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4573B1
#4573B1
oklch(55.1% 0.11 256.3)
- #966812
#966812
oklch(55.2% 0.11 76.5)
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 #4573B1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.017
- French Blue #436BAD ΔE 0.023
- Windows Blue #3778BF ΔE 0.024
- Muted Blue #3B719F ΔE 0.031
- Dull Blue #49759C ΔE 0.035
- Nice Blue #107AB0 ΔE 0.036
- Mid Blue #276AB3 ΔE 0.040
- Steel Blue #4682B4 ΔE 0.043
Use #4573B1 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.