#515E71
Closest named color: Slate (#516572). oklch(47.8% 0.035 257.8), rgb(81, 94, 113).
Aa
White text reads best on this color (6.58:1).
About this color
#515E71 is a medium-dark, muted blue. In OKLCH its lightness is 48%, its chroma 0.035 and its hue 258°. 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 6.58:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.18:1 |
| White text | 6.58:1 |
Values
| HEX | #515E71 |
| RGB | rgb(81, 94, 113) |
| HSL | hsl(216, 16%, 38%) |
| OKLCH | oklch(47.8% 0.035 257.8) |
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 #515E71 | 6.58:1 | AA | Lc -87.6 | Fine for body text |
| Black text on #515E71 | 3.18:1 | AA large text | Lc 21.5 | Dividers and decoration only |
| #515E71 text on white | 6.58:1 | AA | Lc 82.6 | Fine for body text |
| #515E71 text on black | 3.18:1 | AA large text | Lc -19.3 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D5D9DF
oklch(88.4% 0.009 258.3)
-
Step 300
300
#BAC1CC
oklch(80.9% 0.017 259.4)
-
Step 400
400
#96A1B2
oklch(70.6% 0.028 259)
-
Step 500
500
#7D8B9F
oklch(63.2% 0.034 257.3)
-
Step 600
600
#66748A
oklch(55.5% 0.038 259.4)
-
Step 700
700 (this color)
#515E71
oklch(47.8% 0.035 257.8)
-
Step 800
800
#45505F
oklch(42.7% 0.029 256.2)
-
Step 900
900
#3A424E
oklch(37.7% 0.023 258.4)
-
Step 950
950
#22272D
oklch(27% 0.013 253)
#515E71 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) | #585F72 | 0.011 |
| Deuteranopia (no green cones) | #545C71 | 0.007 |
| Tritanopia (no blue cones) | #486264 | 0.031 |
| Achromatopsia (no color) | #5D5D5D | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515E71
#515E71
oklch(47.8% 0.035 257.8)
- #685B47
#685B47
oklch(47.8% 0.035 78.4)
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 #515E71, 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
- Dusk #4E5481 ΔE 0.046
- Denim #3B638C ΔE 0.047
- Dim Gray #696969 ΔE 0.055
- Dusky Blue #475F94 ΔE 0.057
- Light Navy Blue #2E5A88 ΔE 0.059
Use #515E71 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.