#51758D
Closest named color: Metallic Blue (#4F738E). oklch(54.5% 0.056 238.3), rgb(81, 117, 141).
Aa
White text reads best on this color (4.90:1).
About this color
#51758D is a medium-dark, muted blue. In OKLCH its lightness is 54%, its chroma 0.056 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.007 away. White text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.27:1 |
| White text | 4.90:1 |
Values
| HEX | #51758D |
| RGB | rgb(81, 117, 141) |
| HSL | hsl(204, 27%, 44%) |
| OKLCH | oklch(54.5% 0.056 238.3) |
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 #51758D | 4.90:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #51758D | 4.27:1 | AA large text | Lc 30.1 | Non-text elements, placeholder text |
| #51758D text on white | 4.90:1 | AA | Lc 73.9 | Content text, not long reading |
| #51758D text on black | 4.27:1 | AA large text | Lc -27.8 | Dividers and decoration only |
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
#E6EBEE
oklch(93.7% 0.007 233.6)
-
Step 200
200
#D1DBE1
oklch(88.6% 0.014 233.8)
-
Step 300
300
#B2C3CF
oklch(80.8% 0.025 238.5)
-
Step 400
400
#8AA5B7
oklch(70.8% 0.04 237.3)
-
Step 500
500
#6D8EA5
oklch(63% 0.051 239)
-
Step 600
600 (this color)
#51758D
oklch(54.5% 0.056 238.3)
-
Step 700
700
#44657B
oklch(49% 0.052 238.4)
-
Step 800
800
#395364
oklch(42.8% 0.042 237.7)
-
Step 900
900
#314451
oklch(37.6% 0.033 238.7)
-
Step 950
950
#1D2830
oklch(27% 0.021 240.1)
#51758D 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) | #6A748E | 0.032 |
| Deuteranopia (no green cones) | #626E8D | 0.028 |
| Tritanopia (no blue cones) | #3A7B7D | 0.043 |
| Achromatopsia (no color) | #717171 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51758D
#51758D
oklch(54.5% 0.056 238.3)
- #896850
#896850
oklch(54.4% 0.055 57.3)
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 #51758D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.007
- Dull Blue #49759C ΔE 0.025
- Stormy Blue #507B9C ΔE 0.025
- Cerulean #457B9D ΔE 0.027
- Grey Blue #647D8E ΔE 0.036
- Muted Blue #3B719F ΔE 0.041
- Battleship Gray #6C757D ΔE 0.041
- Battleship Grey #6B7C85 ΔE 0.044
Use #51758D 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.