#4257DD
Closest named color: Warm Blue (#4B57DB). oklch(52.3% 0.204 270.7), rgb(66, 87, 221).
Aa
White text reads best on this color (5.77:1).
About this color
#4257DD is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.204 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.011 away. White text reads best on it, at 5.77:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.204) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.63:1 |
| White text | 5.77:1 |
Values
| HEX | #4257DD |
| RGB | rgb(66, 87, 221) |
| HSL | hsl(232, 70%, 56%) |
| OKLCH | oklch(52.3% 0.204 270.7) |
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 #4257DD | 5.77:1 | AA | Lc -83.6 | Fine for body text |
| Black text on #4257DD | 3.63:1 | AA large text | Lc 25.8 | Dividers and decoration only |
| #4257DD text on white | 5.77:1 | AA | Lc 78.3 | Fine for body text |
| #4257DD text on black | 3.63:1 | AA large text | Lc -23.5 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FE
oklch(93.5% 0.029 271.1)
-
Step 200
200
#CBD8FE
oklch(88.5% 0.054 270.4)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7D99FF
oklch(70.7% 0.152 270.5)
-
Step 500
500
#5F7BFF
oklch(63.1% 0.198 270.7)
-
Step 600
600
#485EF1
oklch(55.5% 0.22 270.8)
-
Step 700
700 (this color)
#4257DD
oklch(52.3% 0.204 270.7)
-
Step 800
800
#3040AA
oklch(42.8% 0.169 270.8)
-
Step 900
900
#293886
oklch(37.7% 0.131 270.6)
-
Step 950
950
#18224F
oklch(27.2% 0.083 270.5)
#4257DD 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) | #006DE1 | 0.057 |
| Deuteranopia (no green cones) | #005FDA | 0.041 |
| Tritanopia (no blue cones) | #007992 | 0.164 |
| Achromatopsia (no color) | #666666 | 0.205 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4257DD
#4257DD
oklch(52.3% 0.204 270.7)
- #816600
#816600
oklch(52.2% 0.107 90.5)
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 #4257DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.011
- Neon Blue #4361EE ΔE 0.035
- Azul #1D5DEC ΔE 0.037
- Royal Blue #4169E1 ΔE 0.043
- Dark Periwinkle #665FD1 ΔE 0.058
- Iris #6258C4 ΔE 0.058
- Cerulean Blue #056EEE ΔE 0.062
- Slate Blue #6A5ACD ΔE 0.062
Use #4257DD 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.