#4E51B7
Closest named color: Iris (#6258C4). oklch(49% 0.158 277.6), rgb(78, 81, 183).
Aa
White text reads best on this color (6.59:1).
About this color
#4E51B7 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.158 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.041 away. White text reads best on it, at 6.59:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.18:1 |
| White text | 6.59:1 |
Values
| HEX | #4E51B7 |
| RGB | rgb(78, 81, 183) |
| HSL | hsl(238, 42%, 51%) |
| OKLCH | oklch(49% 0.158 277.6) |
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 #4E51B7 | 6.59:1 | AA | Lc -87.4 | Fine for body text |
| Black text on #4E51B7 | 3.18:1 | AA large text | Lc 21.7 | Dividers and decoration only |
| #4E51B7 text on white | 6.59:1 | AA | Lc 82.3 | Fine for body text |
| #4E51B7 text on black | 3.18:1 | AA large text | Lc -19.6 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D2D7F6
oklch(88.5% 0.043 278.2)
-
Step 300
300
#B4BDF2
oklch(81% 0.076 277.1)
-
Step 400
400
#8E98EC
oklch(70.6% 0.123 277.6)
-
Step 500
500
#747DE6
oklch(63.2% 0.156 277.3)
-
Step 600
600
#5F63D4
oklch(55.6% 0.17 277.8)
-
Step 700
700 (this color)
#4E51B7
oklch(49% 0.158 277.6)
-
Step 800
800
#404394
oklch(42.6% 0.13 277.7)
-
Step 900
900
#363A76
oklch(37.8% 0.101 277.5)
-
Step 950
950
#1F2245
oklch(26.9% 0.064 277.4)
#4E51B7 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) | #0461BA | 0.064 |
| Deuteranopia (no green cones) | #0059B5 | 0.062 |
| Tritanopia (no blue cones) | #0F697C | 0.138 |
| Achromatopsia (no color) | #5D5D5D | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4E51B7
#4E51B7
oklch(49% 0.158 277.6)
- #706000
#706000
oklch(49% 0.101 97.8)
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 #4E51B7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.041
- Bluey Purple #6241C7 ΔE 0.051
- Blue With A Hint Of Purple #533CC6 ΔE 0.051
- Warm Blue #4B57DB ΔE 0.057
- Blurple #5539CC ΔE 0.060
- Slate Blue #6A5ACD ΔE 0.060
- Dark Periwinkle #665FD1 ΔE 0.065
- Light Indigo #6D5ACF ΔE 0.066
Use #4E51B7 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.