#51556F
Closest named color: Dusty Grape (#545775). oklch(45.6% 0.043 277.8), rgb(81, 85, 111).
Aa
White text reads best on this color (7.29:1).
About this color
#51556F is a medium-dark, muted blue. In OKLCH its lightness is 46%, its chroma 0.043 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dusty Grape (#545775), ΔE 0.012 away. White text reads best on it, at 7.29:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Dusty Grape (#545775) |
| Black text | 2.87:1 |
| White text | 7.29:1 |
Values
| HEX | #51556F |
| RGB | rgb(81, 85, 111) |
| HSL | hsl(232, 16%, 38%) |
| OKLCH | oklch(45.6% 0.043 277.8) |
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 #51556F | 7.29:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #51556F | 2.87:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #51556F text on white | 7.29:1 | AAA | Lc 85.3 | Fine for body text |
| #51556F text on black | 2.87:1 | Fails | Lc -16.7 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8E9EF
oklch(93.5% 0.008 278.6)
-
Step 200
200
#D7D8E2
oklch(88.4% 0.014 281.5)
-
Step 300
300
#BCBFD1
oklch(80.8% 0.025 278.3)
-
Step 400
400
#9A9FBA
oklch(70.8% 0.04 277.1)
-
Step 500
500
#8287A9
oklch(63.2% 0.051 278.3)
-
Step 600
600
#6B7194
oklch(55.7% 0.055 276.9)
-
Step 700
700
#595E7E
oklch(49% 0.052 277.4)
-
Step 800
800 (this color)
#51556F
oklch(45.6% 0.043 277.8)
-
Step 900
900
#3D4053
oklch(37.7% 0.033 277.7)
-
Step 950
950
#242631
oklch(27.1% 0.021 276.9)
#51556F 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) | #4E5870 | 0.009 |
| Deuteranopia (no green cones) | #4C556E | 0.008 |
| Tritanopia (no blue cones) | #4A5A5E | 0.038 |
| Achromatopsia (no color) | #565656 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51556F
#51556F
oklch(45.6% 0.043 277.8)
- #5D573C
#5D573C
oklch(45.5% 0.042 97.1)
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 #51556F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusty Grape #545775 ΔE 0.012
- YInMn Blue #415A77 ΔE 0.026
- Dusk #4E5481 ΔE 0.031
- Slate #516572 ΔE 0.048
- Twilight #4E518B ΔE 0.051
- Light Navy Blue #2E5A88 ΔE 0.055
- Denim #3B638C ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.060
Use #51556F 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.