#515F77
Closest named color: Slate (#516572). oklch(48.3% 0.043 261.1), rgb(81, 95, 119).
Aa
White text reads best on this color (6.45:1).
About this color
#515F77 is a medium-dark, muted blue. In OKLCH its lightness is 48%, its chroma 0.043 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.022 away. White text reads best on it, at 6.45:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.25:1 |
| White text | 6.45:1 |
Values
| HEX | #515F77 |
| RGB | rgb(81, 95, 119) |
| HSL | hsl(218, 19%, 39%) |
| OKLCH | oklch(48.3% 0.043 261.1) |
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 #515F77 | 6.45:1 | AA | Lc -87.1 | Fine for body text |
| Black text on #515F77 | 3.25:1 | AA large text | Lc 22.0 | Dividers and decoration only |
| #515F77 text on white | 6.45:1 | AA | Lc 82.0 | Fine for body text |
| #515F77 text on black | 3.25:1 | AA large text | Lc -19.9 | 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
#D5D9E1
oklch(88.5% 0.012 264.5)
-
Step 300
300
#B9C1CE
oklch(80.9% 0.02 260.2)
-
Step 400
400
#95A1B6
oklch(70.6% 0.034 261.7)
-
Step 500
500
#7B8AA4
oklch(63.1% 0.043 261.4)
-
Step 600
600
#64748F
oklch(55.6% 0.046 260.8)
-
Step 700
700 (this color)
#515F77
oklch(48.3% 0.043 261.1)
-
Step 800
800
#444F63
oklch(42.6% 0.036 262.3)
-
Step 900
900
#394250
oklch(37.7% 0.027 259.2)
-
Step 950
950
#22272F
oklch(27.1% 0.017 259.8)
#515F77 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) | #576078 | 0.010 |
| Deuteranopia (no green cones) | #535D76 | 0.006 |
| Tritanopia (no blue cones) | #466467 | 0.038 |
| Achromatopsia (no color) | #5E5E5E | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515F77
#515F77
oklch(48.3% 0.043 261.1)
- #6B5C43
#6B5C43
oklch(48.3% 0.042 80.2)
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 #515F77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.022
- Dusty Grape #545775 ΔE 0.023
- YInMn Blue #415A77 ΔE 0.028
- Denim #3B638C ΔE 0.040
- Dusk #4E5481 ΔE 0.041
- Dusky Blue #475F94 ΔE 0.049
- Light Navy Blue #2E5A88 ΔE 0.054
- Denim Blue #3B5B92 ΔE 0.055
Use #515F77 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.