#515DB5
Closest named color: Iris (#6258C4). oklch(51.4% 0.138 274.6), rgb(81, 93, 181).
Aa
White text reads best on this color (5.86:1).
About this color
#515DB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.138 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.036 away. White text reads best on it, at 5.86:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.58:1 |
| White text | 5.86:1 |
Values
| HEX | #515DB5 |
| RGB | rgb(81, 93, 181) |
| HSL | hsl(233, 40%, 51%) |
| OKLCH | oklch(51.4% 0.138 274.6) |
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 #515DB5 | 5.86:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #515DB5 | 3.58:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #515DB5 text on white | 5.86:1 | AA | Lc 79.1 | Fine for body text |
| #515DB5 text on black | 3.58:1 | AA large text | Lc -22.7 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D1D8F2
oklch(88.5% 0.037 273.7)
-
Step 300
300
#B3BEED
oklch(80.9% 0.068 274.5)
-
Step 400
400
#8D9BE3
oklch(70.7% 0.107 274.9)
-
Step 500
500
#7281DB
oklch(63.2% 0.136 274.7)
-
Step 600
600
#5B68C9
oklch(55.6% 0.149 274.7)
-
Step 700
700 (this color)
#515DB5
oklch(51.4% 0.138 274.6)
-
Step 800
800
#3D478D
oklch(42.7% 0.115 274.4)
-
Step 900
900
#343C70
oklch(37.6% 0.089 274.7)
-
Step 950
950
#1E2442
oklch(27.1% 0.056 273.5)
#515DB5 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) | #3369B8 | 0.041 |
| Deuteranopia (no green cones) | #2661B3 | 0.045 |
| Tritanopia (no blue cones) | #1D7180 | 0.123 |
| Achromatopsia (no color) | #656565 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515DB5
#515DB5
oklch(51.4% 0.138 274.6)
- #7B6500
#7B6500
oklch(51.3% 0.105 93.9)
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 #515DB5, closest first.
No curated palette has a color within ΔE 0.04 of #515DB5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.036
- French Blue #436BAD ΔE 0.044
- Mid Blue #276AB3 ΔE 0.051
- Slate Blue #6A5ACD ΔE 0.053
- Dark Periwinkle #665FD1 ΔE 0.054
- Dusky Blue #475F94 ΔE 0.056
- Light Indigo #6D5ACF ΔE 0.059
- Warm Blue #4B57DB ΔE 0.063
Use #515DB5 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.