#4257D4
Closest named color: Warm Blue (#4B57DB). oklch(51.6% 0.193 270.8), rgb(66, 87, 212).
Aa
White text reads best on this color (5.92:1).
About this color
#4257D4 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.193 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.016 away. White text reads best on it, at 5.92:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.193) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.54:1 |
| White text | 5.92:1 |
Values
| HEX | #4257D4 |
| RGB | rgb(66, 87, 212) |
| HSL | hsl(231, 63%, 55%) |
| OKLCH | oklch(51.6% 0.193 270.8) |
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 #4257D4 | 5.92:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #4257D4 | 3.54:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #4257D4 text on white | 5.92:1 | AA | Lc 79.1 | Fine for body text |
| #4257D4 text on black | 3.54:1 | AA large text | Lc -22.7 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CCD8FC
oklch(88.5% 0.051 270.8)
-
Step 300
300
#AABEFE
oklch(81% 0.094 270.8)
-
Step 400
400
#7E99FD
oklch(70.6% 0.149 270.8)
-
Step 500
500
#607CFB
oklch(63.1% 0.191 270.7)
-
Step 600
600
#4A61EA
oklch(55.6% 0.207 270.8)
-
Step 700
700 (this color)
#4257D4
oklch(51.6% 0.193 270.8)
-
Step 800
800
#3142A4
oklch(42.7% 0.158 270.7)
-
Step 900
900
#2A3982
oklch(37.6% 0.124 270.6)
-
Step 950
950
#19224C
oklch(27% 0.078 271.2)
#4257D4 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) | #006BD8 | 0.055 |
| Deuteranopia (no green cones) | #005DD2 | 0.041 |
| Tritanopia (no blue cones) | #00768D | 0.156 |
| Achromatopsia (no color) | #646464 | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4257D4
#4257D4
oklch(51.6% 0.193 270.8)
- #7F6400
#7F6400
oklch(51.6% 0.105 90.1)
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 #4257D4, closest first.
No curated palette has a color within ΔE 0.04 of #4257D4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.016
- Neon Blue #4361EE ΔE 0.046
- Royal Blue #4169E1 ΔE 0.046
- Azul #1D5DEC ΔE 0.047
- Iris #6258C4 ΔE 0.050
- Dark Periwinkle #665FD1 ΔE 0.055
- Slate Blue #6A5ACD ΔE 0.058
- Blue With A Hint Of Purple #533CC6 ΔE 0.062
Use #4257D4 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.