#515AB1
Closest named color: Iris (#6258C4). oklch(50.5% 0.137 275.9), rgb(81, 90, 177).
Aa
White text reads best on this color (6.09:1).
About this color
#515AB1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.137 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.040 away. White text reads best on it, at 6.09:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.44:1 |
| White text | 6.09:1 |
Values
| HEX | #515AB1 |
| RGB | rgb(81, 90, 177) |
| HSL | hsl(234, 38%, 51%) |
| OKLCH | oklch(50.5% 0.137 275.9) |
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 #515AB1 | 6.09:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #515AB1 | 3.44:1 | AA large text | Lc 23.8 | Dividers and decoration only |
| #515AB1 text on white | 6.09:1 | AA | Lc 80.2 | Fine for body text |
| #515AB1 text on black | 3.44:1 | AA large text | Lc -21.6 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D2D8F2
oklch(88.6% 0.036 275.3)
-
Step 300
300
#B4BEEC
oklch(80.9% 0.066 275.3)
-
Step 400
400
#8E9BE2
oklch(70.7% 0.105 275.4)
-
Step 500
500
#7480DA
oklch(63.1% 0.135 276.1)
-
Step 600
600
#5E68C8
oklch(55.7% 0.147 276)
-
Step 700
700 (this color)
#515AB1
oklch(50.5% 0.137 275.9)
-
Step 800
800
#3F478C
oklch(42.8% 0.113 275.6)
-
Step 900
900
#353C70
oklch(37.7% 0.089 275.5)
-
Step 950
950
#1F2341
oklch(26.9% 0.056 276.2)
#515AB1 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) | #3066B4 | 0.044 |
| Deuteranopia (no green cones) | #245EAF | 0.047 |
| Tritanopia (no blue cones) | #236D7D | 0.120 |
| Achromatopsia (no color) | #626262 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515AB1
#515AB1
oklch(50.5% 0.137 275.9)
- #776300
#776300
oklch(50.4% 0.104 95.1)
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 #515AB1, closest first.
No curated palette has a color within ΔE 0.04 of #515AB1.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.040
- French Blue #436BAD ΔE 0.049
- Dusky Blue #475F94 ΔE 0.053
- Mid Blue #276AB3 ΔE 0.055
- Slate Blue #6A5ACD ΔE 0.058
- Denim Blue #3B5B92 ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.060
- Twilight #4E518B ΔE 0.063
Use #515AB1 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.