#537DCC
Closest named color: Windows Blue (#3778BF). oklch(59.6% 0.13 262), rgb(83, 125, 204).
Aa
Black text reads best on this color (5.17:1).
About this color
#537DCC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.130 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.038 away. Black text reads best on it, at 5.17:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.17:1 |
| White text | 4.05:1 |
Values
| HEX | #537DCC |
| RGB | rgb(83, 125, 204) |
| HSL | hsl(219, 54%, 56%) |
| OKLCH | oklch(59.6% 0.13 262) |
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 #537DCC | 4.05:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #537DCC | 5.17:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #537DCC text on white | 4.05:1 | AA large text | Lc 67.6 | Content text, not long reading |
| #537DCC text on black | 5.17:1 | AA | Lc -34.0 | 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 500.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF1
oklch(88.6% 0.035 262)
-
Step 300
300
#AAC1EB
oklch(80.8% 0.065 262.4)
-
Step 400
400
#7EA1E0
oklch(70.8% 0.101 261.8)
-
Step 500
500 (this color)
#537DCC
oklch(59.6% 0.13 262)
-
Step 600
600
#4370C5
oklch(55.6% 0.141 261.9)
-
Step 700
700
#355DAA
oklch(49% 0.131 262.1)
-
Step 800
800
#2C4D8A
oklch(42.8% 0.109 261.6)
-
Step 900
900
#28406E
oklch(37.6% 0.085 262.3)
-
Step 950
950
#182641
oklch(27.1% 0.054 262.5)
#537DCC 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) | #5B84CF | 0.022 |
| Deuteranopia (no green cones) | #4B79CA | 0.015 |
| Tritanopia (no blue cones) | #008F9B | 0.113 |
| Achromatopsia (no color) | #7E7E7E | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #537DCC
#537DCC
oklch(59.6% 0.13 262)
- #A37600
#A37600
oklch(59.5% 0.123 81.9)
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 #537DCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.038
- Cool Blue #4984B8 ΔE 0.042
- Steel Blue #4682B4 ΔE 0.045
- Water Blue #0E87CC ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.052
- Off Blue #5684AE ΔE 0.055
- Soft Blue #6488EA ΔE 0.056
- Faded Blue #658CBB ΔE 0.060
Use #537DCC 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.