#4F51CB
Closest named color: Warm Blue (#4B57DB). oklch(50.6% 0.185 276.8), rgb(79, 81, 203).
Aa
White text reads best on this color (6.22:1).
About this color
#4F51CB is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.185 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.028 away. White text reads best on it, at 6.22:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.37:1 |
| White text | 6.22:1 |
Values
| HEX | #4F51CB |
| RGB | rgb(79, 81, 203) |
| HSL | hsl(239, 54%, 55%) |
| OKLCH | oklch(50.6% 0.185 276.8) |
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 #4F51CB | 6.22:1 | AA | Lc -85.8 | Fine for body text |
| Black text on #4F51CB | 3.37:1 | AA large text | Lc 23.5 | Dividers and decoration only |
| #4F51CB text on white | 6.22:1 | AA | Lc 80.6 | Fine for body text |
| #4F51CB text on black | 3.37:1 | AA large text | Lc -21.3 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D0D7FB
oklch(88.5% 0.05 276.6)
-
Step 300
300
#B1BCFB
oklch(80.9% 0.09 276.5)
-
Step 400
400
#8B96F8
oklch(70.6% 0.143 277.2)
-
Step 500
500
#7079F5
oklch(63.1% 0.183 276.7)
-
Step 600
600
#5B5EE4
oklch(55.6% 0.199 276.8)
-
Step 700
700 (this color)
#4F51CB
oklch(50.6% 0.185 276.8)
-
Step 800
800
#3D40A0
oklch(42.8% 0.152 276.5)
-
Step 900
900
#34377F
oklch(37.7% 0.119 277.2)
-
Step 950
950
#1E214A
oklch(27% 0.075 277)
#4F51CB 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) | #0066CF | 0.068 |
| Deuteranopia (no green cones) | #005BC9 | 0.060 |
| Tritanopia (no blue cones) | #006F86 | 0.157 |
| Achromatopsia (no color) | #616161 | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F51CB
#4F51CB
oklch(50.6% 0.185 276.8)
- #766400
#766400
oklch(50.5% 0.104 96.7)
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 #4F51CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.028
- Iris #6258C4 ΔE 0.037
- Bluey Purple #6241C7 ΔE 0.042
- Blue With A Hint Of Purple #533CC6 ΔE 0.044
- Blurple #5539CC ΔE 0.048
- Slate Blue #6A5ACD ΔE 0.048
- Dark Periwinkle #665FD1 ΔE 0.051
- Light Indigo #6D5ACF ΔE 0.053
Use #4F51CB 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.