#515F6F
Closest named color: Slate (#516572). oklch(48% 0.031 251.9), rgb(81, 95, 111).
Aa
White text reads best on this color (6.52:1).
About this color
#515F6F is a medium-dark, muted blue. In OKLCH its lightness is 48%, its chroma 0.031 and its hue 252°. 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 6.52:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.21:1 |
| White text | 6.52:1 |
Values
| HEX | #515F6F |
| RGB | rgb(81, 95, 111) |
| HSL | hsl(212, 16%, 38%) |
| OKLCH | oklch(48% 0.031 251.9) |
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 #515F6F | 6.52:1 | AA | Lc -87.4 | Fine for body text |
| Black text on #515F6F | 3.21:1 | AA large text | Lc 21.7 | Dividers and decoration only |
| #515F6F text on white | 6.52:1 | AA | Lc 82.4 | Fine for body text |
| #515F6F text on black | 3.21:1 | AA large text | Lc -19.5 | 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
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D5DADF
oklch(88.6% 0.009 247.9)
-
Step 300
300
#BAC1CA
oklch(80.8% 0.015 254.6)
-
Step 400
400
#96A2B0
oklch(70.7% 0.025 252.2)
-
Step 500
500
#7C8B9C
oklch(63.1% 0.031 251.6)
-
Step 600
600
#657587
oklch(55.6% 0.034 251.5)
-
Step 700
700 (this color)
#515F6F
oklch(48% 0.031 251.9)
-
Step 800
800
#45505D
oklch(42.7% 0.026 252.7)
-
Step 900
900
#3A424C
oklch(37.6% 0.02 254.1)
-
Step 950
950
#22272D
oklch(27% 0.013 253)
#515F6F 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) | #595F70 | 0.012 |
| Deuteranopia (no green cones) | #565C6F | 0.011 |
| Tritanopia (no blue cones) | #496364 | 0.028 |
| Achromatopsia (no color) | #5E5E5E | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515F6F
#515F6F
oklch(48% 0.031 251.9)
- #695B4A
#695B4A
oklch(48% 0.032 72.3)
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 #515F6F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.018
- Dusty Grape #545775 ΔE 0.029
- YInMn Blue #415A77 ΔE 0.032
- Denim #3B638C ΔE 0.050
- Dusk #4E5481 ΔE 0.051
- Dim Gray #696969 ΔE 0.052
- Dusky Blue #475F94 ΔE 0.061
- Light Navy Blue #2E5A88 ΔE 0.063
Use #515F6F 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.