#515FB5
Closest named color: Iris (#6258C4). oklch(51.8% 0.136 273.8), rgb(81, 95, 181).
Aa
White text reads best on this color (5.74:1).
About this color
#515FB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.136 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.038 away. White text reads best on it, at 5.74:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.65:1 |
| White text | 5.74:1 |
Values
| HEX | #515FB5 |
| RGB | rgb(81, 95, 181) |
| HSL | hsl(232, 40%, 51%) |
| OKLCH | oklch(51.8% 0.136 273.8) |
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 #515FB5 | 5.74:1 | AA | Lc -83.8 | Fine for body text |
| Black text on #515FB5 | 3.65:1 | AA large text | Lc 25.5 | Dividers and decoration only |
| #515FB5 text on white | 5.74:1 | AA | Lc 78.5 | Fine for body text |
| #515FB5 text on black | 3.65:1 | AA large text | Lc -23.2 | 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
#B3BEEC
oklch(80.9% 0.066 274.3)
-
Step 400
400
#8C9CE2
oklch(70.8% 0.104 273.6)
-
Step 500
500
#7181DA
oklch(63% 0.135 274.2)
-
Step 600
600
#5A69C7
oklch(55.6% 0.145 273.9)
-
Step 700
700 (this color)
#515FB5
oklch(51.8% 0.136 273.8)
-
Step 800
800
#3D488C
oklch(42.8% 0.112 273.8)
-
Step 900
900
#333D6F
oklch(37.7% 0.086 273.1)
-
Step 950
950
#1E2441
oklch(27% 0.055 273.4)
#515FB5 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) | #376AB8 | 0.037 |
| Deuteranopia (no green cones) | #2A62B3 | 0.041 |
| Tritanopia (no blue cones) | #1C7281 | 0.120 |
| Achromatopsia (no color) | #666666 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515FB5
#515FB5
oklch(51.8% 0.136 273.8)
- #7D6600
#7D6600
oklch(51.8% 0.106 93.4)
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 #515FB5, closest first.
No curated palette has a color within ΔE 0.04 of #515FB5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.038
- French Blue #436BAD ΔE 0.039
- Mid Blue #276AB3 ΔE 0.048
- Dark Periwinkle #665FD1 ΔE 0.054
- Slate Blue #6A5ACD ΔE 0.054
- Dusky Blue #475F94 ΔE 0.055
- Light Indigo #6D5ACF ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.064
Use #515FB5 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.