#51697D
Closest named color: Slate (#516572). oklch(50.9% 0.043 243.9), rgb(81, 105, 125).
Aa
White text reads best on this color (5.72:1).
About this color
#51697D is a medium-dark, muted blue. In OKLCH its lightness is 51%, its chroma 0.043 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.018 away. White text reads best on it, at 5.72:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.66:1 |
| White text | 5.72:1 |
Values
| HEX | #51697D |
| RGB | rgb(81, 105, 125) |
| HSL | hsl(207, 21%, 40%) |
| OKLCH | oklch(50.9% 0.043 243.9) |
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 #51697D | 5.72:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #51697D | 3.66:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #51697D text on white | 5.72:1 | AA | Lc 78.6 | Fine for body text |
| #51697D text on black | 3.66:1 | AA large text | Lc -23.2 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D3DAE0
oklch(88.5% 0.011 243.7)
-
Step 300
300
#B6C2CD
oklch(80.8% 0.02 245.7)
-
Step 400
400
#90A3B4
oklch(70.6% 0.033 245.3)
-
Step 500
500
#748DA2
oklch(63.1% 0.043 243.8)
-
Step 600
600
#5C778D
oklch(55.6% 0.047 243.3)
-
Step 700
700 (this color)
#51697D
oklch(50.9% 0.043 243.9)
-
Step 800
800
#3E5161
oklch(42.5% 0.036 244.2)
-
Step 900
900
#35434F
oklch(37.5% 0.027 244.5)
-
Step 950
950
#1F282E
oklch(27.1% 0.017 237.4)
#51697D 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) | #61697E | 0.022 |
| Deuteranopia (no green cones) | #5B647D | 0.019 |
| Tritanopia (no blue cones) | #436E6F | 0.036 |
| Achromatopsia (no color) | #666666 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51697D
#51697D
oklch(50.9% 0.043 243.9)
- #78614C
#78614C
oklch(51% 0.043 64)
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 #51697D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.018
- Metallic Blue #4F738E ΔE 0.034
- Denim #3B638C ΔE 0.043
- Dim Gray #696969 ΔE 0.044
- YInMn Blue #415A77 ΔE 0.052
- Dusty Grape #545775 ΔE 0.052
- Dull Blue #49759C ΔE 0.052
- Battleship Gray #6C757D ΔE 0.055
Use #51697D 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.