#537F8B
Closest named color: Grey Blue (#647D8E). oklch(56.9% 0.052 216.8), rgb(83, 127, 139).
Aa
Black text reads best on this color (4.77:1).
About this color
#537F8B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 57%, its chroma 0.052 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Grey Blue (#647D8E), ΔE 0.022 away. Black text reads best on it, at 4.77:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | Grey Blue (#647D8E) |
| Black text | 4.77:1 |
| White text | 4.39:1 |
Values
| HEX | #537F8B |
| RGB | rgb(83, 127, 139) |
| HSL | hsl(193, 25%, 44%) |
| OKLCH | oklch(56.9% 0.052 216.8) |
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 #537F8B | 4.39:1 | AA large text | Lc -75.9 | Fine for body text |
| Black text on #537F8B | 4.77:1 | AA | Lc 33.7 | Non-text elements, placeholder text |
| #537F8B text on white | 4.39:1 | AA large text | Lc 70.4 | Content text, not long reading |
| #537F8B text on black | 4.77:1 | AA | Lc -31.2 | 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
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#D0DBDF
oklch(88.4% 0.013 221.4)
-
Step 300
300
#B1C5CA
oklch(81% 0.023 214.4)
-
Step 400
400
#87A7B0
oklch(70.7% 0.038 216.7)
-
Step 500
500
#68919C
oklch(63.1% 0.048 216.2)
-
Step 600
600 (this color)
#537F8B
oklch(56.9% 0.052 216.8)
-
Step 700
700
#406872
oklch(49.2% 0.048 215.4)
-
Step 800
800
#35555D
oklch(42.8% 0.04 215.3)
-
Step 900
900
#2E464C
oklch(37.7% 0.031 215.1)
-
Step 950
950
#1B292D
oklch(27% 0.02 217.4)
#537F8B 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) | #777C8C | 0.046 |
| Deuteranopia (no green cones) | #6E758B | 0.043 |
| Tritanopia (no blue cones) | #3D8483 | 0.031 |
| Achromatopsia (no color) | #787878 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #537F8B
#537F8B
oklch(56.9% 0.052 216.8)
- #936D62
#936D62
oklch(57% 0.052 36.8)
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 #537F8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grey Blue #647D8E ΔE 0.022
- Battleship Grey #6B7C85 ΔE 0.029
- Stormy Blue #507B9C ΔE 0.033
- Cerulean #457B9D ΔE 0.036
- Steel Grey #6F828A ΔE 0.037
- Slate Gray #708090 ΔE 0.038
- Metallic Blue #4F738E ΔE 0.039
- Battleship Gray #6C757D ΔE 0.040
Use #537F8B 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.