#515DB0
Closest named color: French Blue (#436BAD). oklch(51% 0.131 274.6), rgb(81, 93, 176).
Aa
White text reads best on this color (5.92:1).
About this color
#515DB0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.131 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.041 away. White text reads best on it, at 5.92:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.54:1 |
| White text | 5.92:1 |
Values
| HEX | #515DB0 |
| RGB | rgb(81, 93, 176) |
| HSL | hsl(232, 38%, 50%) |
| OKLCH | oklch(51% 0.131 274.6) |
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 #515DB0 | 5.92:1 | AA | Lc -84.7 | Fine for body text |
| Black text on #515DB0 | 3.54:1 | AA large text | Lc 24.6 | Dividers and decoration only |
| #515DB0 text on white | 5.92:1 | AA | Lc 79.5 | Fine for body text |
| #515DB0 text on black | 3.54:1 | AA large text | Lc -22.4 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D2D8F1
oklch(88.5% 0.035 274.9)
-
Step 300
300
#B4BEEA
oklch(80.9% 0.063 274.9)
-
Step 400
400
#8E9CE0
oklch(70.8% 0.101 274.6)
-
Step 500
500
#7382D7
oklch(63.2% 0.129 274.6)
-
Step 600
600
#5C69C4
oklch(55.5% 0.141 274.8)
-
Step 700
700 (this color)
#515DB0
oklch(51% 0.131 274.6)
-
Step 800
800
#3E4889
oklch(42.7% 0.108 274.4)
-
Step 900
900
#353D6E
oklch(37.8% 0.084 274.7)
-
Step 950
950
#1F2440
oklch(27% 0.052 274.7)
#515DB0 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) | #3768B3 | 0.038 |
| Deuteranopia (no green cones) | #2C60AE | 0.040 |
| Tritanopia (no blue cones) | #246F7E | 0.115 |
| Achromatopsia (no color) | #646464 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515DB0
#515DB0
oklch(51% 0.131 274.6)
- #796400
#796400
oklch(50.9% 0.104 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 #515DB0, closest first.
No curated palette has a color within ΔE 0.04 of #515DB0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.041
- Iris #6258C4 ΔE 0.042
- Dusky Blue #475F94 ΔE 0.049
- Mid Blue #276AB3 ΔE 0.050
- Denim Blue #3B5B92 ΔE 0.057
- Slate Blue #6A5ACD ΔE 0.060
- Dark Periwinkle #665FD1 ΔE 0.060
- Twilight #4E518B ΔE 0.064
Use #515DB0 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.