#51708F
Closest named color: Metallic Blue (#4F738E). oklch(53.4% 0.061 249), rgb(81, 112, 143).
Aa
White text reads best on this color (5.16:1).
About this color
#51708F is a medium-dark, muted blue. In OKLCH its lightness is 53%, its chroma 0.061 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.010 away. White text reads best on it, at 5.16:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.06:1 |
| White text | 5.16:1 |
Values
| HEX | #51708F |
| RGB | rgb(81, 112, 143) |
| HSL | hsl(210, 28%, 44%) |
| OKLCH | oklch(53.4% 0.061 249) |
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 #51708F | 5.16:1 | AA | Lc -80.9 | Fine for body text |
| Black text on #51708F | 4.06:1 | AA large text | Lc 28.5 | Dividers and decoration only |
| #51708F text on white | 5.16:1 | AA | Lc 75.5 | Fine for body text |
| #51708F text on black | 4.06:1 | AA large text | Lc -26.2 | 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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D2DAE3
oklch(88.5% 0.015 251.2)
-
Step 300
300
#B4C3D2
oklch(81% 0.027 248.2)
-
Step 400
400
#8CA3BB
oklch(70.6% 0.044 249.6)
-
Step 500
500
#6F8DAA
oklch(63.1% 0.056 247.8)
-
Step 600
600 (this color)
#51708F
oklch(53.4% 0.061 249)
-
Step 700
700
#476480
oklch(49.2% 0.057 248.2)
-
Step 800
800
#3B5168
oklch(42.7% 0.047 250.1)
-
Step 900
900
#324354
oklch(37.6% 0.037 248.8)
-
Step 950
950
#1E2731
oklch(26.9% 0.023 251.3)
#51708F 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) | #647190 | 0.026 |
| Deuteranopia (no green cones) | #5C6A8E | 0.021 |
| Tritanopia (no blue cones) | #3A777A | 0.052 |
| Achromatopsia (no color) | #6D6D6D | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51708F
#51708F
oklch(53.4% 0.061 249)
- #846746
#846746
oklch(53.5% 0.06 69.6)
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 #51708F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.010
- Dull Blue #49759C ΔE 0.022
- Muted Blue #3B719F ΔE 0.032
- Stormy Blue #507B9C ΔE 0.033
- Cerulean #457B9D ΔE 0.034
- Flat Blue #3C73A8 ΔE 0.042
- Grey Blue #647D8E ΔE 0.049
- Denim #3B638C ΔE 0.049
Use #51708F 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.