#537DC5
Closest named color: Cool Blue (#4984B8). oklch(59.2% 0.12 260.6), rgb(83, 125, 197).
Aa
Black text reads best on this color (5.10:1).
About this color
#537DC5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.120 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.033 away. Black text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.10:1 |
| White text | 4.11:1 |
Values
| HEX | #537DC5 |
| RGB | rgb(83, 125, 197) |
| HSL | hsl(218, 50%, 55%) |
| OKLCH | oklch(59.2% 0.12 260.6) |
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 #537DC5 | 4.11:1 | AA large text | Lc -73.6 | Content text, not long reading |
| Black text on #537DC5 | 5.10:1 | AA | Lc 36.0 | Non-text elements, placeholder text |
| #537DC5 text on white | 4.11:1 | AA large text | Lc 68.1 | Content text, not long reading |
| #537DC5 text on black | 5.10:1 | AA | Lc -33.6 | 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
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAEE
oklch(88.5% 0.03 260.7)
-
Step 300
300
#ADC2E4
oklch(81% 0.053 260)
-
Step 400
400
#82A1D7
oklch(70.6% 0.087 261.3)
-
Step 500
500
#6289CC
oklch(63% 0.111 260.8)
-
Step 600
600 (this color)
#537DC5
oklch(59.2% 0.12 260.6)
-
Step 700
700
#3A5FA0
oklch(49% 0.113 260.9)
-
Step 800
800
#304E81
oklch(42.6% 0.092 260.4)
-
Step 900
900
#2B4168
oklch(37.7% 0.073 261.2)
-
Step 950
950
#19263D
oklch(26.9% 0.047 261.3)
#537DC5 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) | #5F83C8 | 0.023 |
| Deuteranopia (no green cones) | #5078C3 | 0.015 |
| Tritanopia (no blue cones) | #008D98 | 0.105 |
| Achromatopsia (no color) | #7D7D7D | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #537DC5
#537DC5
oklch(59.2% 0.12 260.6)
- #A27508
#A27508
oklch(59.2% 0.12 81.2)
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 #537DC5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.033
- Windows Blue #3778BF ΔE 0.033
- Steel Blue #4682B4 ΔE 0.035
- Off Blue #5684AE ΔE 0.045
- Water Blue #0E87CC ΔE 0.046
- Dusty Blue #5A86AD ΔE 0.051
- Faded Blue #658CBB ΔE 0.054
- Flat Blue #3C73A8 ΔE 0.057
Use #537DC5 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.