#51556D
Closest named color: Dusty Grape (#545775). oklch(45.5% 0.039 277.3), rgb(81, 85, 109).
Aa
White text reads best on this color (7.31:1).
About this color
#51556D is a medium-dark, muted blue. In OKLCH its lightness is 46%, its chroma 0.039 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Grape (#545775), ΔE 0.014 away. White text reads best on it, at 7.31:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dusty Grape (#545775) |
| Black text | 2.87:1 |
| White text | 7.31:1 |
Values
| HEX | #51556D |
| RGB | rgb(81, 85, 109) |
| HSL | hsl(231, 15%, 37%) |
| OKLCH | oklch(45.5% 0.039 277.3) |
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 #51556D | 7.31:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #51556D | 2.87:1 | Fails | Lc 18.6 | Dividers and decoration only |
| #51556D text on white | 7.31:1 | AAA | Lc 85.4 | Fine for body text |
| #51556D text on black | 2.87:1 | Fails | Lc -16.6 | 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 800.
-
Step 50
50
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E8E9EE
oklch(93.5% 0.007 277.2)
-
Step 200
200
#D7D8E2
oklch(88.4% 0.014 281.5)
-
Step 300
300
#BCC0D0
oklch(81% 0.023 274.7)
-
Step 400
400
#9A9FB8
oklch(70.7% 0.037 276.5)
-
Step 500
500
#8287A6
oklch(63% 0.047 277.8)
-
Step 600
600
#6B7192
oklch(55.6% 0.052 276.6)
-
Step 700
700
#5A5E7C
oklch(49% 0.048 278.5)
-
Step 800
800 (this color)
#51556D
oklch(45.5% 0.039 277.3)
-
Step 900
900
#3D4052
oklch(37.6% 0.031 277.4)
-
Step 950
950
#242630
oklch(27.1% 0.019 276.2)
#51556D 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) | #4E576E | 0.007 |
| Deuteranopia (no green cones) | #4D556C | 0.006 |
| Tritanopia (no blue cones) | #4A595D | 0.035 |
| Achromatopsia (no color) | #565656 | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51556D
#51556D
oklch(45.5% 0.039 277.3)
- #5D573E
#5D573E
oklch(45.5% 0.039 96.2)
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 #51556D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Grape #545775 ΔE 0.014
- YInMn Blue #415A77 ΔE 0.027
- Dusk #4E5481 ΔE 0.034
- Slate #516572 ΔE 0.047
- Twilight #4E518B ΔE 0.054
- Light Navy Blue #2E5A88 ΔE 0.057
- Denim #3B638C ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.063
Use #51556D 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.