#4570BC
Closest named color: Windows Blue (#3778BF). oklch(55.1% 0.128 261), rgb(69, 112, 188).
Aa
White text reads best on this color (4.88:1).
About this color
#4570BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.128 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.023 away. White text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.29:1 |
| White text | 4.88:1 |
Values
| HEX | #4570BC |
| RGB | rgb(69, 112, 188) |
| HSL | hsl(218, 47%, 50%) |
| OKLCH | oklch(55.1% 0.128 261) |
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 #4570BC | 4.88:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #4570BC | 4.29:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #4570BC text on white | 4.88:1 | AA | Lc 73.6 | Content text, not long reading |
| #4570BC text on black | 4.29:1 | AA large text | Lc -28.1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CDDAEF
oklch(88.5% 0.032 260)
-
Step 300
300
#ACC2E7
oklch(81% 0.058 260.8)
-
Step 400
400
#80A1DA
oklch(70.6% 0.092 261.1)
-
Step 500
500
#6089D1
oklch(63.2% 0.118 261.1)
-
Step 600
600 (this color)
#4570BC
oklch(55.1% 0.128 261)
-
Step 700
700
#385FA4
oklch(49.2% 0.119 261)
-
Step 800
800
#2F4E84
oklch(42.8% 0.097 260.8)
-
Step 900
900
#29416A
oklch(37.7% 0.077 260.5)
-
Step 950
950
#19263E
oklch(27% 0.049 262)
#4570BC 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) | #4E77BF | 0.023 |
| Deuteranopia (no green cones) | #3D6CBA | 0.015 |
| Tritanopia (no blue cones) | #00818D | 0.107 |
| Achromatopsia (no color) | #717171 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4570BC
#4570BC
oklch(55.1% 0.128 261)
- #946900
#946900
oklch(55.1% 0.114 80.3)
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 #4570BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.023
- French Blue #436BAD ΔE 0.026
- Mid Blue #276AB3 ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.036
- Nice Blue #107AB0 ΔE 0.048
- Muted Blue #3B719F ΔE 0.049
- Steel Blue #4682B4 ΔE 0.056
- Dull Blue #49759C ΔE 0.056
Use #4570BC 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.