#4571A3
Closest named color: Flat Blue (#3C73A8). oklch(53.9% 0.093 252.7), rgb(69, 113, 163).
Aa
White text reads best on this color (5.06:1).
About this color
#4571A3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.093 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.011 away. White text reads best on it, at 5.06:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.14:1 |
| White text | 5.06:1 |
Values
| HEX | #4571A3 |
| RGB | rgb(69, 113, 163) |
| HSL | hsl(212, 41%, 45%) |
| OKLCH | oklch(53.9% 0.093 252.7) |
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 #4571A3 | 5.06:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #4571A3 | 4.14:1 | AA large text | Lc 29.2 | Dividers and decoration only |
| #4571A3 text on white | 5.06:1 | AA | Lc 74.8 | Content text, not long reading |
| #4571A3 text on black | 4.14:1 | AA large text | Lc -26.9 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF2
oklch(93.7% 0.012 248)
-
Step 200
200
#CFDAE9
oklch(88.5% 0.024 256.1)
-
Step 300
300
#AEC3DC
oklch(80.9% 0.042 252.9)
-
Step 400
400
#83A4CA
oklch(70.8% 0.067 252.3)
-
Step 500
500
#638DBC
oklch(63.2% 0.085 251.9)
-
Step 600
600 (this color)
#4571A3
oklch(53.9% 0.093 252.7)
-
Step 700
700
#3B6390
oklch(49.1% 0.086 252.5)
-
Step 800
800
#315175
oklch(42.7% 0.071 252.4)
-
Step 900
900
#2B435F
oklch(37.6% 0.057 253)
-
Step 950
950
#1A2737
oklch(26.9% 0.035 254.1)
#4571A3 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) | #5C73A5 | 0.029 |
| Deuteranopia (no green cones) | #506AA2 | 0.022 |
| Tritanopia (no blue cones) | #007C83 | 0.079 |
| Achromatopsia (no color) | #6E6E6E | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4571A3
#4571A3
oklch(53.9% 0.093 252.7)
- #8F6529
#8F6529
oklch(53.9% 0.093 73)
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 #4571A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.011
- Muted Blue #3B719F ΔE 0.012
- Dull Blue #49759C ΔE 0.019
- French Blue #436BAD ΔE 0.026
- Cerulean #457B9D ΔE 0.033
- Metallic Blue #4F738E ΔE 0.037
- Stormy Blue #507B9C ΔE 0.037
- Nice Blue #107AB0 ΔE 0.039
Use #4571A3 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.