#5151C7
Closest named color: Iris (#6258C4). oklch(50.4% 0.179 277.8), rgb(81, 81, 199).
Aa
White text reads best on this color (6.26:1).
About this color
#5151C7 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.179 and its hue 278°. 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 6.26:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.179) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.35:1 |
| White text | 6.26:1 |
Values
| HEX | #5151C7 |
| RGB | rgb(81, 81, 199) |
| HSL | hsl(240, 51%, 55%) |
| OKLCH | oklch(50.4% 0.179 277.8) |
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 #5151C7 | 6.26:1 | AA | Lc -85.9 | Fine for body text |
| Black text on #5151C7 | 3.35:1 | AA large text | Lc 23.3 | Dividers and decoration only |
| #5151C7 text on white | 6.26:1 | AA | Lc 80.8 | Fine for body text |
| #5151C7 text on black | 3.35:1 | AA large text | Lc -21.1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D1D7F9
oklch(88.5% 0.047 277.5)
-
Step 300
300
#B3BCF9
oklch(81% 0.087 277.8)
-
Step 400
400
#8D96F5
oklch(70.6% 0.138 278.1)
-
Step 500
500
#7379F1
oklch(63% 0.177 277.9)
-
Step 600
600
#5E5FE0
oklch(55.7% 0.192 277.8)
-
Step 700
700 (this color)
#5151C7
oklch(50.4% 0.179 277.8)
-
Step 800
800
#3F409D
oklch(42.7% 0.148 277.7)
-
Step 900
900
#35377D
oklch(37.6% 0.116 278)
-
Step 950
950
#1F2149
oklch(27% 0.073 278.2)
#5151C7 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) | #0065CB | 0.069 |
| Deuteranopia (no green cones) | #005BC5 | 0.064 |
| Tritanopia (no blue cones) | #006E84 | 0.155 |
| Achromatopsia (no color) | #606060 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5151C7
#5151C7
oklch(50.4% 0.179 277.8)
- #756400
#756400
oklch(50.4% 0.104 97.5)
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 #5151C7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.033
- Warm Blue #4B57DB ΔE 0.034
- Bluey Purple #6241C7 ΔE 0.040
- Blue With A Hint Of Purple #533CC6 ΔE 0.044
- Slate Blue #6A5ACD ΔE 0.047
- Blurple #5539CC ΔE 0.049
- Dark Periwinkle #665FD1 ΔE 0.050
- Light Indigo #6D5ACF ΔE 0.052
Use #5151C7 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.