#537BC0
Closest named color: Windows Blue (#3778BF). oklch(58.5% 0.116 260.7), rgb(83, 123, 192).
Aa
Black text reads best on this color (4.96:1).
About this color
#537BC0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.116 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.029 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.96:1 |
| White text | 4.23:1 |
Values
| HEX | #537BC0 |
| RGB | rgb(83, 123, 192) |
| HSL | hsl(218, 46%, 54%) |
| OKLCH | oklch(58.5% 0.116 260.7) |
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 #537BC0 | 4.23:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #537BC0 | 4.96:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #537BC0 text on white | 4.23:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #537BC0 text on black | 4.96:1 | AA | Lc -32.6 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#AEC2E3
oklch(81% 0.052 260.4)
-
Step 400
400
#83A1D5
oklch(70.6% 0.084 261.2)
-
Step 500
500
#6489CA
oklch(63% 0.107 261.2)
-
Step 600
600 (this color)
#537BC0
oklch(58.5% 0.116 260.7)
-
Step 700
700
#3C609D
oklch(49.2% 0.107 260.4)
-
Step 800
800
#324E7F
oklch(42.6% 0.089 260.9)
-
Step 900
900
#2C4166
oklch(37.6% 0.069 261.2)
-
Step 950
950
#1A263C
oklch(26.9% 0.045 261.9)
#537BC0 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) | #5F81C3 | 0.023 |
| Deuteranopia (no green cones) | #5176BF | 0.014 |
| Tritanopia (no blue cones) | #008A94 | 0.103 |
| Achromatopsia (no color) | #7B7B7B | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #537BC0
#537BC0
oklch(58.5% 0.116 260.7)
- #9F7312
#9F7312
oklch(58.5% 0.116 80.5)
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 #537BC0, closest first.
No curated palette has a color within ΔE 0.04 of #537BC0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.029
- Cool Blue #4984B8 ΔE 0.032
- Steel Blue #4682B4 ΔE 0.033
- Off Blue #5684AE ΔE 0.043
- Water Blue #0E87CC ΔE 0.049
- Dusty Blue #5A86AD ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.050
- French Blue #436BAD ΔE 0.055
Use #537BC0 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.