#51807B
Closest named color: Battleship Grey (#6B7C85). oklch(56.5% 0.052 187.3), rgb(81, 128, 123).
Aa
Black text reads best on this color (4.72:1).
About this color
#51807B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 56%, its chroma 0.052 and its hue 187°. Its hue sits on the cool side of the wheel. The nearest named color is Battleship Grey (#6B7C85), ΔE 0.040 away. Black text reads best on it, at 4.72:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | Battleship Grey (#6B7C85) |
| Black text | 4.72:1 |
| White text | 4.44:1 |
Values
| HEX | #51807B |
| RGB | rgb(81, 128, 123) |
| HSL | hsl(174, 22%, 41%) |
| OKLCH | oklch(56.5% 0.052 187.3) |
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 #51807B | 4.44:1 | AA large text | Lc -76.3 | Fine for body text |
| Black text on #51807B | 4.72:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #51807B text on white | 4.44:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #51807B text on black | 4.72:1 | AA | Lc -30.9 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEA
oklch(93.5% 0.007 185.3)
-
Step 200
200
#D0DCDA
oklch(88.5% 0.013 185.1)
-
Step 300
300
#B1C6C3
oklch(81% 0.023 186.4)
-
Step 400
400
#87A9A4
oklch(70.8% 0.038 185.4)
-
Step 500
500
#68938E
oklch(63% 0.048 187)
-
Step 600
600 (this color)
#51807B
oklch(56.5% 0.052 187.3)
-
Step 700
700
#3F6A65
oklch(49.1% 0.049 186.3)
-
Step 800
800
#345653
oklch(42.6% 0.04 188.7)
-
Step 900
900
#2E4744
oklch(37.7% 0.031 186.5)
-
Step 950
950
#1B2A28
oklch(27.1% 0.021 185.7)
#51807B 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) | #7B7B7B | 0.055 |
| Deuteranopia (no green cones) | #73757C | 0.052 |
| Tritanopia (no blue cones) | #40827E | 0.016 |
| Achromatopsia (no color) | #787878 | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51807B
#51807B
oklch(56.5% 0.052 187.3)
- #916970
#916970
oklch(56.4% 0.052 7.3)
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 #51807B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Battleship Grey #6B7C85 ΔE 0.040
- Grey Blue #647D8E ΔE 0.042
- Dusty Teal #4C9085 ΔE 0.046
- Battleship Gray #6C757D ΔE 0.046
- Steel Grey #6F828A ΔE 0.046
- Teal #008080 ΔE 0.047
- Dark Cyan #008B8B ΔE 0.049
- Slate Gray #708090 ΔE 0.054
Use #51807B 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.