#515EB9
Closest named color: Iris (#6258C4). oklch(51.8% 0.143 274.2), rgb(81, 94, 185).
Aa
White text reads best on this color (5.75:1).
About this color
#515EB9 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.143 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.033 away. White text reads best on it, at 5.75:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.65:1 |
| White text | 5.75:1 |
Values
| HEX | #515EB9 |
| RGB | rgb(81, 94, 185) |
| HSL | hsl(233, 43%, 52%) |
| OKLCH | oklch(51.8% 0.143 274.2) |
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 #515EB9 | 5.75:1 | AA | Lc -83.8 | Fine for body text |
| Black text on #515EB9 | 3.65:1 | AA large text | Lc 25.5 | Dividers and decoration only |
| #515EB9 text on white | 5.75:1 | AA | Lc 78.5 | Fine for body text |
| #515EB9 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
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D1D8F3
oklch(88.5% 0.038 274.1)
-
Step 300
300
#B2BEEE
oklch(80.9% 0.069 273.8)
-
Step 400
400
#8B9BE5
oklch(70.6% 0.11 273.9)
-
Step 500
500
#7080DE
oklch(63% 0.142 274.3)
-
Step 600
600
#5A68CB
oklch(55.6% 0.152 274.3)
-
Step 700
700 (this color)
#515EB9
oklch(51.8% 0.143 274.2)
-
Step 800
800
#3C478F
oklch(42.8% 0.119 273.8)
-
Step 900
900
#333C72
oklch(37.7% 0.092 274)
-
Step 950
950
#1E2343
oklch(26.9% 0.06 275)
#515EB9 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) | #316ABC | 0.042 |
| Deuteranopia (no green cones) | #2262B7 | 0.046 |
| Tritanopia (no blue cones) | #167283 | 0.125 |
| Achromatopsia (no color) | #666666 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515EB9
#515EB9
oklch(51.8% 0.143 274.2)
- #7C6700
#7C6700
oklch(51.9% 0.107 94.9)
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 #515EB9, closest first.
No curated palette has a color within ΔE 0.04 of #515EB9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.033
- French Blue #436BAD ΔE 0.044
- Dark Periwinkle #665FD1 ΔE 0.048
- Slate Blue #6A5ACD ΔE 0.049
- Mid Blue #276AB3 ΔE 0.051
- Light Indigo #6D5ACF ΔE 0.055
- Warm Blue #4B57DB ΔE 0.057
- Dusky Blue #475F94 ΔE 0.062
Use #515EB9 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.