#515F75
Closest named color: Slate (#516572). oklch(48.2% 0.04 259.4), rgb(81, 95, 117).
Aa
White text reads best on this color (6.47:1).
About this color
#515F75 is a medium-dark, muted blue. In OKLCH its lightness is 48%, its chroma 0.040 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.021 away. White text reads best on it, at 6.47:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.24:1 |
| White text | 6.47:1 |
Values
| HEX | #515F75 |
| RGB | rgb(81, 95, 117) |
| HSL | hsl(217, 18%, 39%) |
| OKLCH | oklch(48.2% 0.04 259.4) |
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 #515F75 | 6.47:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #515F75 | 3.24:1 | AA large text | Lc 21.9 | Dividers and decoration only |
| #515F75 text on white | 6.47:1 | AA | Lc 82.1 | Fine for body text |
| #515F75 text on black | 3.24:1 | AA large text | Lc -19.8 | 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
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D5D9E0
oklch(88.4% 0.011 261.8)
-
Step 300
300
#B9C1CD
oklch(80.8% 0.019 258.4)
-
Step 400
400
#95A1B4
oklch(70.6% 0.031 259.6)
-
Step 500
500
#7C8AA2
oklch(63.1% 0.04 261.2)
-
Step 600
600
#65748D
oklch(55.6% 0.043 260.6)
-
Step 700
700 (this color)
#515F75
oklch(48.2% 0.04 259.4)
-
Step 800
800
#445061
oklch(42.8% 0.032 257.1)
-
Step 900
900
#3A424F
oklch(37.7% 0.025 260.1)
-
Step 950
950
#22272E
oklch(27.1% 0.015 256.8)
#515F75 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) | #586076 | 0.011 |
| Deuteranopia (no green cones) | #545D75 | 0.007 |
| Tritanopia (no blue cones) | #476466 | 0.036 |
| Achromatopsia (no color) | #5E5E5E | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515F75
#515F75
oklch(48.2% 0.04 259.4)
- #6A5C45
#6A5C45
oklch(48.2% 0.039 79.9)
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 #515F75, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.021
- Dusty Grape #545775 ΔE 0.024
- YInMn Blue #415A77 ΔE 0.029
- Denim #3B638C ΔE 0.042
- Dusk #4E5481 ΔE 0.044
- Dusky Blue #475F94 ΔE 0.052
- Dim Gray #696969 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.056
Use #515F75 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.