#4B57DB
Named color: Warm Blue. oklch(52.7% 0.199 273.4), rgb(75, 87, 219).
Aa
White text reads best on this color (5.69:1).
About this color
#4B57DB is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.199 and its hue 273°. Its hue sits on the cool side of the wheel. It is the named color Warm Blue. White text reads best on it, at 5.69:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.199) |
| Temperature | cool |
| Nearest name | Warm Blue |
| Black text | 3.68:1 |
| White text | 5.69:1 |
Values
| HEX | #4B57DB |
| RGB | rgb(75, 87, 219) |
| HSL | hsl(235, 67%, 58%) |
| OKLCH | oklch(52.7% 0.199 273.4) |
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 #4B57DB | 5.69:1 | AA | Lc -83.3 | Fine for body text |
| Black text on #4B57DB | 3.68:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #4B57DB text on white | 5.69:1 | AA | Lc 78.0 | Fine for body text |
| #4B57DB text on black | 3.68:1 | AA large text | Lc -23.8 | 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 600.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CED8FB
oklch(88.6% 0.049 272.8)
-
Step 300
300
#AEBDFB
oklch(80.9% 0.089 273.7)
-
Step 400
400
#8498F9
oklch(70.6% 0.144 273.4)
-
Step 500
500
#687BF6
oklch(63% 0.183 273.4)
-
Step 600
600 (this color)
#4B57DB
oklch(52.7% 0.199 273.4)
-
Step 700
700
#444FC7
oklch(49.2% 0.185 273.5)
-
Step 800
800
#3741A1
oklch(42.6% 0.154 273.4)
-
Step 900
900
#2F3980
oklch(37.8% 0.119 273.3)
-
Step 950
950
#1B224B
oklch(27% 0.076 273)
#4B57DB 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) | #006DDF | 0.063 |
| Deuteranopia (no green cones) | #0060D8 | 0.051 |
| Tritanopia (no blue cones) | #007891 | 0.163 |
| Achromatopsia (no color) | #676767 | 0.200 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B57DB
#4B57DB
oklch(52.7% 0.199 273.4)
- #806900
#806900
oklch(52.8% 0.108 93.8)
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 #4B57DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.036
- Royal Blue #4169E1 ΔE 0.042
- Azul #1D5DEC ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.047
- Iris #6258C4 ΔE 0.048
- Slate Blue #6A5ACD ΔE 0.051
- Light Indigo #6D5ACF ΔE 0.054
- Bluey Purple #6241C7 ΔE 0.062
Use #4B57DB 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.