#51647B
Closest named color: Slate (#516572). oklch(49.7% 0.044 253.5), rgb(81, 100, 123).
Aa
White text reads best on this color (6.07:1).
About this color
#51647B is a medium-dark, muted blue. In OKLCH its lightness is 50%, its chroma 0.044 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.016 away. White text reads best on it, at 6.07:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.45:1 |
| White text | 6.07:1 |
Values
| HEX | #51647B |
| RGB | rgb(81, 100, 123) |
| HSL | hsl(213, 21%, 40%) |
| OKLCH | oklch(49.7% 0.044 253.5) |
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 #51647B | 6.07:1 | AA | Lc -85.5 | Fine for body text |
| Black text on #51647B | 3.45:1 | AA large text | Lc 23.7 | Dividers and decoration only |
| #51647B text on white | 6.07:1 | AA | Lc 80.3 | Fine for body text |
| #51647B text on black | 3.45:1 | AA large text | Lc -21.5 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4DAE1
oklch(88.6% 0.012 252.1)
-
Step 300
300
#B7C2CE
oklch(80.9% 0.021 250.4)
-
Step 400
400
#92A2B6
oklch(70.6% 0.034 254.1)
-
Step 500
500
#788BA4
oklch(63.1% 0.044 255.4)
-
Step 600
600
#60758F
oklch(55.5% 0.048 254)
-
Step 700
700 (this color)
#51647B
oklch(49.7% 0.044 253.5)
-
Step 800
800
#415063
oklch(42.6% 0.037 254.5)
-
Step 900
900
#374350
oklch(37.8% 0.027 250.6)
-
Step 950
950
#20272F
oklch(26.9% 0.018 251.9)
#51647B 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) | #5C657C | 0.016 |
| Deuteranopia (no green cones) | #57607B | 0.014 |
| Tritanopia (no blue cones) | #44696C | 0.037 |
| Achromatopsia (no color) | #626262 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51647B
#51647B
oklch(49.7% 0.044 253.5)
- #725F47
#725F47
oklch(49.8% 0.044 73.1)
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 #51647B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.016
- Dusty Grape #545775 ΔE 0.037
- Denim #3B638C ΔE 0.038
- YInMn Blue #415A77 ΔE 0.039
- Metallic Blue #4F738E ΔE 0.046
- Dusky Blue #475F94 ΔE 0.049
- Dim Gray #696969 ΔE 0.050
- Dusk #4E5481 ΔE 0.052
Use #51647B 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.