#51637E
Closest named color: Slate (#516572). oklch(49.6% 0.049 258.3), rgb(81, 99, 126).
Aa
White text reads best on this color (6.11:1).
About this color
#51637E is a medium-dark, muted blue. In OKLCH its lightness is 50%, its chroma 0.049 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.022 away. White text reads best on it, at 6.11:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.43:1 |
| White text | 6.11:1 |
Values
| HEX | #51637E |
| RGB | rgb(81, 99, 126) |
| HSL | hsl(216, 22%, 41%) |
| OKLCH | oklch(49.6% 0.049 258.3) |
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 #51637E | 6.11:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #51637E | 3.43:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #51637E text on white | 6.11:1 | AA | Lc 80.5 | Fine for body text |
| #51637E text on black | 3.43:1 | AA large text | Lc -21.3 | 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 700.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4DAE2
oklch(88.6% 0.013 255.5)
-
Step 300
300
#B7C1D0
oklch(80.8% 0.024 258.4)
-
Step 400
400
#92A2B9
oklch(70.7% 0.038 257.4)
-
Step 500
500
#788BA7
oklch(63.2% 0.048 258)
-
Step 600
600
#617492
oklch(55.5% 0.052 259.4)
-
Step 700
700 (this color)
#51637E
oklch(49.6% 0.049 258.3)
-
Step 800
800
#415065
oklch(42.7% 0.04 256.8)
-
Step 900
900
#374252
oklch(37.6% 0.031 257.7)
-
Step 950
950
#202730
oklch(27% 0.02 254.8)
#51637E 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) | #5A647F | 0.013 |
| Deuteranopia (no green cones) | #55607D | 0.010 |
| Tritanopia (no blue cones) | #43696C | 0.044 |
| Achromatopsia (no color) | #626262 | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51637E
#51637E
oklch(49.6% 0.049 258.3)
- #715F42
#715F42
oklch(49.6% 0.049 79.2)
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 #51637E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.022
- Denim #3B638C ΔE 0.034
- Dusty Grape #545775 ΔE 0.035
- YInMn Blue #415A77 ΔE 0.037
- Dusky Blue #475F94 ΔE 0.043
- Dusk #4E5481 ΔE 0.047
- Metallic Blue #4F738E ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.053
Use #51637E 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.