#515A8A
Closest named color: Dusk (#4E5481). oklch(48.1% 0.078 275), rgb(81, 90, 138).
Aa
White text reads best on this color (6.60:1).
About this color
#515A8A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.078 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.021 away. White text reads best on it, at 6.60:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 3.17:1 |
| White text | 6.60:1 |
Values
| HEX | #515A8A |
| RGB | rgb(81, 90, 138) |
| HSL | hsl(231, 26%, 43%) |
| OKLCH | oklch(48.1% 0.078 275) |
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 #515A8A | 6.60:1 | AA | Lc -87.7 | Fine for body text |
| Black text on #515A8A | 3.17:1 | AA large text | Lc 21.4 | Dividers and decoration only |
| #515A8A text on white | 6.60:1 | AA | Lc 82.6 | Fine for body text |
| #515A8A text on black | 3.17:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F1
oklch(93.5% 0.011 274.9)
-
Step 200
200
#D5D8E7
oklch(88.4% 0.021 276.9)
-
Step 300
300
#B9BFDA
oklch(80.9% 0.039 275.6)
-
Step 400
400
#959EC7
oklch(70.7% 0.061 275.1)
-
Step 500
500
#7B86B9
oklch(63.1% 0.078 274.6)
-
Step 600
600
#656FA5
oklch(55.6% 0.085 275.3)
-
Step 700
700 (this color)
#515A8A
oklch(48.1% 0.078 275)
-
Step 800
800
#454C72
oklch(42.7% 0.064 275.4)
-
Step 900
900
#3A3F5C
oklch(37.6% 0.05 276.2)
-
Step 950
950
#222536
oklch(27% 0.032 276.3)
#515A8A 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) | #4A5F8C | 0.016 |
| Deuteranopia (no green cones) | #455B89 | 0.017 |
| Tritanopia (no blue cones) | #3F646B | 0.071 |
| Achromatopsia (no color) | #5D5D5D | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515A8A
#515A8A
oklch(48.1% 0.078 275)
- #6C5D24
#6C5D24
oklch(48.1% 0.078 94.5)
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 #515A8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.021
- Dusky Blue #475F94 ΔE 0.022
- Twilight #4E518B ΔE 0.027
- Denim Blue #3B5B92 ΔE 0.030
- Dusty Grape #545775 ΔE 0.033
- Denim #3B638C ΔE 0.035
- YInMn Blue #415A77 ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.043
Use #515A8A 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.