#515CAB
Closest named color: French Blue (#436BAD). oklch(50.5% 0.125 275), rgb(81, 92, 171).
Aa
White text reads best on this color (6.05:1).
About this color
#515CAB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.125 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.042 away. White text reads best on it, at 6.05:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.46:1 |
| White text | 6.05:1 |
Values
| HEX | #515CAB |
| RGB | rgb(81, 92, 171) |
| HSL | hsl(233, 36%, 49%) |
| OKLCH | oklch(50.5% 0.125 275) |
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 #515CAB | 6.05:1 | AA | Lc -85.3 | Fine for body text |
| Black text on #515CAB | 3.46:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #515CAB text on white | 6.05:1 | AA | Lc 80.1 | Fine for body text |
| #515CAB text on black | 3.46:1 | AA large text | Lc -21.8 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8F0
oklch(88.5% 0.034 274.5)
-
Step 300
300
#B5BEE8
oklch(80.9% 0.06 275.5)
-
Step 400
400
#8F9CDD
oklch(70.8% 0.096 275)
-
Step 500
500
#7482D4
oklch(63.1% 0.124 274.9)
-
Step 600
600
#5E6AC1
oklch(55.6% 0.135 275.2)
-
Step 700
700 (this color)
#515CAB
oklch(50.5% 0.125 275)
-
Step 800
800
#3F4887
oklch(42.6% 0.104 275)
-
Step 900
900
#353D6C
oklch(37.7% 0.081 274.6)
-
Step 950
950
#1F243F
oklch(27% 0.051 274.5)
#515CAB 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) | #3A66AE | 0.035 |
| Deuteranopia (no green cones) | #305FA9 | 0.038 |
| Tritanopia (no blue cones) | #296D7B | 0.111 |
| Achromatopsia (no color) | #626262 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515CAB
#515CAB
oklch(50.5% 0.125 275)
- #776300
#776300
oklch(50.4% 0.104 95.1)
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 #515CAB, closest first.
No curated palette has a color within ΔE 0.04 of #515CAB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.042
- Dusky Blue #475F94 ΔE 0.042
- Iris #6258C4 ΔE 0.048
- Denim Blue #3B5B92 ΔE 0.050
- Mid Blue #276AB3 ΔE 0.051
- Twilight #4E518B ΔE 0.056
- Denim #3B638C ΔE 0.064
- Slate Blue #6A5ACD ΔE 0.066
Use #515CAB 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.