#537CCF
Closest named color: Windows Blue (#3778BF). oklch(59.6% 0.135 263.1), rgb(83, 124, 207).
Aa
Black text reads best on this color (5.15:1).
About this color
#537CCF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.135 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.039 away. Black text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.15:1 |
| White text | 4.07:1 |
Values
| HEX | #537CCF |
| RGB | rgb(83, 124, 207) |
| HSL | hsl(220, 56%, 57%) |
| OKLCH | oklch(59.6% 0.135 263.1) |
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 #537CCF | 4.07:1 | AA large text | Lc -73.2 | Content text, not long reading |
| Black text on #537CCF | 5.15:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #537CCF text on white | 4.07:1 | AA large text | Lc 67.7 | Content text, not long reading |
| #537CCF text on black | 5.15:1 | AA | Lc -33.9 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF2
oklch(88.6% 0.036 262.8)
-
Step 300
300
#AAC1EC
oklch(80.8% 0.066 262.8)
-
Step 400
400
#7EA0E3
oklch(70.7% 0.106 263.3)
-
Step 500
500 (this color)
#537CCF
oklch(59.6% 0.135 263.1)
-
Step 600
600
#446FC8
oklch(55.6% 0.146 263.1)
-
Step 700
700
#365CAD
oklch(49% 0.137 263.3)
-
Step 800
800
#2D4C8C
oklch(42.8% 0.112 263)
-
Step 900
900
#284070
oklch(37.8% 0.088 262.8)
-
Step 950
950
#182642
oklch(27.2% 0.056 263.1)
#537CCF 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) | #5884D2 | 0.023 |
| Deuteranopia (no green cones) | #4778CD | 0.018 |
| Tritanopia (no blue cones) | #008F9B | 0.118 |
| Achromatopsia (no color) | #7E7E7E | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #537CCF
#537CCF
oklch(59.6% 0.135 263.1)
- #A27700
#A27700
oklch(59.6% 0.123 83.2)
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 #537CCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.039
- Cool Blue #4984B8 ΔE 0.047
- Water Blue #0E87CC ΔE 0.049
- Steel Blue #4682B4 ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.052
- Soft Blue #6488EA ΔE 0.054
- Off Blue #5684AE ΔE 0.061
- Faded Blue #658CBB ΔE 0.065
Use #537CCF 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.