#51707B
Closest named color: Metallic Blue (#4F738E). oklch(52.5% 0.04 221.8), rgb(81, 112, 123).
Aa
White text reads best on this color (5.31:1).
About this color
#51707B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 53%, its chroma 0.040 and its hue 222°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.029 away. White text reads best on it, at 5.31:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.95:1 |
| White text | 5.31:1 |
Values
| HEX | #51707B |
| RGB | rgb(81, 112, 123) |
| HSL | hsl(196, 21%, 40%) |
| OKLCH | oklch(52.5% 0.04 221.8) |
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 #51707B | 5.31:1 | AA | Lc -81.7 | Fine for body text |
| Black text on #51707B | 3.95:1 | AA large text | Lc 27.7 | Dividers and decoration only |
| #51707B text on white | 5.31:1 | AA | Lc 76.4 | Fine for body text |
| #51707B text on black | 3.95:1 | AA large text | Lc -25.3 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E6EBEC
oklch(93.7% 0.006 211)
-
Step 200
200
#D2DBDE
oklch(88.5% 0.011 219.6)
-
Step 300
300
#B5C3C9
oklch(80.8% 0.018 225.2)
-
Step 400
400
#8EA5AD
oklch(70.7% 0.028 220.8)
-
Step 500
500
#728F99
oklch(63.1% 0.036 220.9)
-
Step 600
600 (this color)
#51707B
oklch(52.5% 0.04 221.8)
-
Step 700
700
#496670
oklch(49.1% 0.038 221.2)
-
Step 800
800
#3C535B
oklch(42.7% 0.031 221.3)
-
Step 900
900
#34454B
oklch(37.8% 0.024 221.5)
-
Step 950
950
#1E282C
oklch(26.9% 0.016 224.2)
#51707B 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) | #696E7C | 0.033 |
| Deuteranopia (no green cones) | #63697B | 0.030 |
| Tritanopia (no blue cones) | #437473 | 0.026 |
| Achromatopsia (no color) | #6B6B6B | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51707B
#51707B
oklch(52.5% 0.04 221.8)
- #7F6359
#7F6359
oklch(52.5% 0.04 40.6)
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 #51707B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.029
- Slate #516572 ΔE 0.032
- Dim Gray #696969 ΔE 0.040
- Battleship Gray #6C757D ΔE 0.041
- Dull Blue #49759C ΔE 0.050
- Deep Aqua #08787F ΔE 0.052
- Grey Blue #647D8E ΔE 0.052
- Battleship Grey #6B7C85 ΔE 0.053
Use #51707B 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.