#537BDB
Closest named color: Soft Blue (#6488EA). oklch(60.1% 0.153 265.1), rgb(83, 123, 219).
Aa
Black text reads best on this color (5.22:1).
About this color
#537BDB is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.153 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.045 away. Black text reads best on it, at 5.22:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 5.22:1 |
| White text | 4.02:1 |
Values
| HEX | #537BDB |
| RGB | rgb(83, 123, 219) |
| HSL | hsl(222, 65%, 59%) |
| OKLCH | oklch(60.1% 0.153 265.1) |
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 #537BDB | 4.02:1 | AA large text | Lc -72.7 | Content text, not long reading |
| Black text on #537BDB | 5.22:1 | AA | Lc 36.9 | Non-text elements, placeholder text |
| #537BDB text on white | 4.02:1 | AA large text | Lc 67.2 | Content text, not long reading |
| #537BDB text on black | 5.22:1 | AA | Lc -34.4 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F6
oklch(88.5% 0.042 266.3)
-
Step 300
300
#A9C0F2
oklch(80.8% 0.075 265.5)
-
Step 400
400
#7C9EEB
oklch(70.6% 0.12 265.3)
-
Step 500
500 (this color)
#537BDB
oklch(60.1% 0.153 265.1)
-
Step 600
600
#426CD3
oklch(55.6% 0.166 264.8)
-
Step 700
700
#3559B7
oklch(49.1% 0.155 265.3)
-
Step 800
800
#2C4994
oklch(42.6% 0.128 265.4)
-
Step 900
900
#273E76
oklch(37.7% 0.1 265.2)
-
Step 950
950
#172545
oklch(27% 0.063 264.7)
#537BDB 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) | #4E85DF | 0.026 |
| Deuteranopia (no green cones) | #3979D9 | 0.026 |
| Tritanopia (no blue cones) | #0091A0 | 0.131 |
| Achromatopsia (no color) | #7F7F7F | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #537BDB
#537BDB
oklch(60.1% 0.153 265.1)
- #A27900
#A27900
oklch(60% 0.123 84.7)
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 #537BDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.045
- Dark Sky Blue #448EE4 ΔE 0.049
- Cornflower #6A79F7 ΔE 0.052
- Windows Blue #3778BF ΔE 0.053
- Royal Blue #4169E1 ΔE 0.054
- Water Blue #0E87CC ΔE 0.058
- Clear Blue #247AFD ΔE 0.061
- Cool Blue #4984B8 ΔE 0.065
Use #537BDB 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.