#515BB9
Closest named color: Iris (#6258C4). oklch(51.2% 0.147 275.4), rgb(81, 91, 185).
Aa
White text reads best on this color (5.92:1).
About this color
#515BB9 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.147 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.031 away. White text reads best on it, at 5.92:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.54:1 |
| White text | 5.92:1 |
Values
| HEX | #515BB9 |
| RGB | rgb(81, 91, 185) |
| HSL | hsl(234, 43%, 52%) |
| OKLCH | oklch(51.2% 0.147 275.4) |
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 #515BB9 | 5.92:1 | AA | Lc -84.6 | Fine for body text |
| Black text on #515BB9 | 3.54:1 | AA large text | Lc 24.7 | Dividers and decoration only |
| #515BB9 text on white | 5.92:1 | AA | Lc 79.4 | Fine for body text |
| #515BB9 text on black | 3.54:1 | AA large text | Lc -22.5 | 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
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D1D8F4
oklch(88.6% 0.039 274.4)
-
Step 300
300
#B3BEEF
oklch(81% 0.07 274.9)
-
Step 400
400
#8D9AE7
oklch(70.7% 0.114 275.8)
-
Step 500
500
#727FE0
oklch(63.1% 0.146 275.7)
-
Step 600
600
#5B67CE
oklch(55.7% 0.158 275.1)
-
Step 700
700 (this color)
#515BB9
oklch(51.2% 0.147 275.4)
-
Step 800
800
#3E4690
oklch(42.8% 0.121 275.4)
-
Step 900
900
#343B73
oklch(37.6% 0.095 275.5)
-
Step 950
950
#1E2343
oklch(26.9% 0.06 275)
#515BB9 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) | #2A68BC | 0.048 |
| Deuteranopia (no green cones) | #1960B7 | 0.052 |
| Tritanopia (no blue cones) | #177081 | 0.129 |
| Achromatopsia (no color) | #646464 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515BB9
#515BB9
oklch(51.2% 0.147 275.4)
- #796500
#796500
oklch(51.1% 0.105 95.4)
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 #515BB9, closest first.
No curated palette has a color within ΔE 0.04 of #515BB9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.031
- Slate Blue #6A5ACD ΔE 0.049
- Dark Periwinkle #665FD1 ΔE 0.050
- French Blue #436BAD ΔE 0.051
- Light Indigo #6D5ACF ΔE 0.054
- Warm Blue #4B57DB ΔE 0.055
- Mid Blue #276AB3 ΔE 0.055
- Dusky Blue #475F94 ΔE 0.064
Use #515BB9 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.