#51707D
Closest named color: Metallic Blue (#4F738E). oklch(52.6% 0.041 225.8), rgb(81, 112, 125).
Aa
White text reads best on this color (5.29:1).
About this color
#51707D is a medium-dark, muted teal or cyan. In OKLCH its lightness is 53%, its chroma 0.041 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.026 away. White text reads best on it, at 5.29:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.96:1 |
| White text | 5.29:1 |
Values
| HEX | #51707D |
| RGB | rgb(81, 112, 125) |
| HSL | hsl(198, 21%, 40%) |
| OKLCH | oklch(52.6% 0.041 225.8) |
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 #51707D | 5.29:1 | AA | Lc -81.7 | Fine for body text |
| Black text on #51707D | 3.96:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #51707D text on white | 5.29:1 | AA | Lc 76.3 | Fine for body text |
| #51707D text on black | 3.96:1 | AA large text | Lc -25.4 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EBEC
oklch(93.7% 0.006 211)
-
Step 200
200
#D2DBDE
oklch(88.5% 0.011 219.6)
-
Step 300
300
#B5C3CA
oklch(80.9% 0.018 229.1)
-
Step 400
400
#8EA5AF
oklch(70.8% 0.03 225.9)
-
Step 500
500
#718F9B
oklch(63.1% 0.038 224.2)
-
Step 600
600 (this color)
#51707D
oklch(52.6% 0.041 225.8)
-
Step 700
700
#496671
oklch(49.2% 0.038 223.4)
-
Step 800
800
#3C535C
oklch(42.7% 0.032 224)
-
Step 900
900
#34454C
oklch(37.9% 0.025 225)
-
Step 950
950
#1E282C
oklch(26.9% 0.016 224.2)
#51707D 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) | #696E7E | 0.033 |
| Deuteranopia (no green cones) | #62697D | 0.029 |
| Tritanopia (no blue cones) | #427474 | 0.028 |
| Achromatopsia (no color) | #6B6B6B | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51707D
#51707D
oklch(52.6% 0.041 225.8)
- #7F6457
#7F6457
oklch(52.6% 0.04 47)
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 #51707D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.026
- Slate #516572 ΔE 0.033
- Battleship Gray #6C757D ΔE 0.041
- Dim Gray #696969 ΔE 0.042
- Dull Blue #49759C ΔE 0.047
- Grey Blue #647D8E ΔE 0.051
- Stormy Blue #507B9C ΔE 0.051
- Cerulean #457B9D ΔE 0.051
Use #51707D 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.