#537B8F
Closest named color: Stormy Blue (#507B9C). oklch(56.1% 0.054 230.6), rgb(83, 123, 143).
Aa
Black text reads best on this color (4.59:1).
About this color
#537B8F is a medium-dark, muted blue. In OKLCH its lightness is 56%, its chroma 0.054 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.021 away. Black text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.59:1 |
| White text | 4.56:1 |
Values
| HEX | #537B8F |
| RGB | rgb(83, 123, 143) |
| HSL | hsl(200, 27%, 44%) |
| OKLCH | oklch(56.1% 0.054 230.6) |
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 #537B8F | 4.56:1 | AA | Lc -77.1 | Fine for body text |
| Black text on #537B8F | 4.59:1 | AA | Lc 32.4 | Non-text elements, placeholder text |
| #537B8F text on white | 4.56:1 | AA | Lc 71.7 | Content text, not long reading |
| #537B8F text on black | 4.59:1 | AA | Lc -30.0 | 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 600.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D1DBE0
oklch(88.5% 0.013 228.9)
-
Step 300
300
#B1C4CE
oklch(80.9% 0.025 230.5)
-
Step 400
400
#88A6B5
oklch(70.8% 0.04 229.6)
-
Step 500
500
#6A90A2
oklch(63.2% 0.05 228.8)
-
Step 600
600 (this color)
#537B8F
oklch(56.1% 0.054 230.6)
-
Step 700
700
#426678
oklch(49% 0.05 230.8)
-
Step 800
800
#375362
oklch(42.6% 0.042 232.4)
-
Step 900
900
#304550
oklch(37.7% 0.032 231.5)
-
Step 950
950
#1C282F
oklch(26.9% 0.021 234.2)
#537B8F 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) | #717990 | 0.039 |
| Deuteranopia (no green cones) | #68738F | 0.033 |
| Tritanopia (no blue cones) | #3B8181 | 0.041 |
| Achromatopsia (no color) | #767676 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #537B8F
#537B8F
oklch(56.1% 0.054 230.6)
- #8F6C58
#8F6C58
oklch(56.1% 0.054 51)
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 #537B8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.021
- Grey Blue #647D8E ΔE 0.022
- Metallic Blue #4F738E ΔE 0.025
- Cerulean #457B9D ΔE 0.025
- Dull Blue #49759C ΔE 0.033
- Battleship Grey #6B7C85 ΔE 0.033
- Battleship Gray #6C757D ΔE 0.039
- Slate Gray #708090 ΔE 0.041
Use #537B8F 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.