#537BAB
Closest named color: Steel Blue (#4682B4). oklch(57.4% 0.087 253.7), rgb(83, 123, 171).
Aa
Black text reads best on this color (4.78:1).
About this color
#537BAB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.087 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.023 away. Black text reads best on it, at 4.78:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.78:1 |
| White text | 4.38:1 |
Values
| HEX | #537BAB |
| RGB | rgb(83, 123, 171) |
| HSL | hsl(213, 35%, 50%) |
| OKLCH | oklch(57.4% 0.087 253.7) |
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 #537BAB | 4.38:1 | AA large text | Lc -75.8 | Fine for body text |
| Black text on #537BAB | 4.78:1 | AA | Lc 33.8 | Non-text elements, placeholder text |
| #537BAB text on white | 4.38:1 | AA large text | Lc 70.3 | Content text, not long reading |
| #537BAB text on black | 4.78:1 | AA | Lc -31.4 | 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 600.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#CFDAE8
oklch(88.4% 0.023 254.4)
-
Step 300
300
#B0C3DA
oklch(81% 0.039 253.3)
-
Step 400
400
#86A3C7
oklch(70.7% 0.062 254.1)
-
Step 500
500
#678CB9
oklch(63% 0.08 253.8)
-
Step 600
600 (this color)
#537BAB
oklch(57.4% 0.087 253.7)
-
Step 700
700
#3F638E
oklch(49.2% 0.081 253.7)
-
Step 800
800
#345173
oklch(42.8% 0.067 253.2)
-
Step 900
900
#2E435D
oklch(37.7% 0.052 254.2)
-
Step 950
950
#1B2736
oklch(26.9% 0.033 254.4)
#537BAB 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) | #687DAD | 0.027 |
| Deuteranopia (no green cones) | #5D75AA | 0.019 |
| Tritanopia (no blue cones) | #27868C | 0.076 |
| Achromatopsia (no color) | #787878 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #537BAB
#537BAB
oklch(57.4% 0.087 253.7)
- #97703A
#97703A
oklch(57.3% 0.087 73.5)
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 #537BAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.023
- Stormy Blue #507B9C ΔE 0.024
- Off Blue #5684AE ΔE 0.026
- Cerulean #457B9D ΔE 0.028
- Cool Blue #4984B8 ΔE 0.028
- Dull Blue #49759C ΔE 0.030
- Dusty Blue #5A86AD ΔE 0.033
- Flat Blue #3C73A8 ΔE 0.036
Use #537BAB 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.