#5151B6
Closest named color: Iris (#6258C4). oklch(49.1% 0.156 279), rgb(81, 81, 182).
Aa
White text reads best on this color (6.55:1).
About this color
#5151B6 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.156 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.039 away. White text reads best on it, at 6.55:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.20:1 |
| White text | 6.55:1 |
Values
| HEX | #5151B6 |
| RGB | rgb(81, 81, 182) |
| HSL | hsl(240, 41%, 52%) |
| OKLCH | oklch(49.1% 0.156 279) |
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 #5151B6 | 6.55:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #5151B6 | 3.20:1 | AA large text | Lc 21.9 | Dividers and decoration only |
| #5151B6 text on white | 6.55:1 | AA | Lc 82.2 | Fine for body text |
| #5151B6 text on black | 3.20:1 | AA large text | Lc -19.7 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D3D7F5
oklch(88.5% 0.041 279.5)
-
Step 300
300
#B6BCF1
oklch(80.9% 0.075 279.5)
-
Step 400
400
#9198EB
oklch(70.8% 0.121 279.1)
-
Step 500
500
#777CE4
oklch(63.1% 0.154 278.9)
-
Step 600
600
#6163D2
oklch(55.6% 0.167 278.7)
-
Step 700
700 (this color)
#5151B6
oklch(49.1% 0.156 279)
-
Step 800
800
#424393
oklch(42.7% 0.129 278.9)
-
Step 900
900
#373975
oklch(37.6% 0.101 278.9)
-
Step 950
950
#202245
oklch(27% 0.064 278.7)
#5151B6 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) | #0B61B9 | 0.066 |
| Deuteranopia (no green cones) | #0059B4 | 0.066 |
| Tritanopia (no blue cones) | #1F687B | 0.135 |
| Achromatopsia (no color) | #5D5D5D | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5151B6
#5151B6
oklch(49.1% 0.156 279)
- #6F6100
#6F6100
oklch(49.1% 0.102 99.4)
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 #5151B6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.039
- Bluey Purple #6241C7 ΔE 0.050
- Blue With A Hint Of Purple #533CC6 ΔE 0.052
- Slate Blue #6A5ACD ΔE 0.058
- Warm Blue #4B57DB ΔE 0.059
- Blurple #5539CC ΔE 0.061
- Light Indigo #6D5ACF ΔE 0.063
- Dark Periwinkle #665FD1 ΔE 0.063
Use #5151B6 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.