#4257C1
Closest named color: Warm Blue (#4B57DB). oklch(50.1% 0.167 270.7), rgb(66, 87, 193).
Aa
White text reads best on this color (6.24:1).
About this color
#4257C1 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.167 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.042 away. White text reads best on it, at 6.24:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.36:1 |
| White text | 6.24:1 |
Values
| HEX | #4257C1 |
| RGB | rgb(66, 87, 193) |
| HSL | hsl(230, 51%, 51%) |
| OKLCH | oklch(50.1% 0.167 270.7) |
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 #4257C1 | 6.24:1 | AA | Lc -85.9 | Fine for body text |
| Black text on #4257C1 | 3.36:1 | AA large text | Lc 23.3 | Dividers and decoration only |
| #4257C1 text on white | 6.24:1 | AA | Lc 80.7 | Fine for body text |
| #4257C1 text on black | 3.36:1 | AA large text | Lc -21.1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F8
oklch(88.5% 0.045 271.7)
-
Step 300
300
#ADBEF6
oklch(80.8% 0.082 271.4)
-
Step 400
400
#839BF1
oklch(70.7% 0.129 271)
-
Step 500
500
#6580EC
oklch(63.2% 0.164 270.5)
-
Step 600
600
#4E66DB
oklch(55.6% 0.18 270.7)
-
Step 700
700 (this color)
#4257C1
oklch(50.1% 0.167 270.7)
-
Step 800
800
#344599
oklch(42.6% 0.138 270.8)
-
Step 900
900
#2D3B7A
oklch(37.6% 0.108 271)
-
Step 950
950
#1A2347
oklch(26.9% 0.068 270.7)
#4257C1 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) | #0066C5 | 0.050 |
| Deuteranopia (no green cones) | #005BBF | 0.043 |
| Tritanopia (no blue cones) | #007083 | 0.138 |
| Achromatopsia (no color) | #606060 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4257C1
#4257C1
oklch(50.1% 0.167 270.7)
- #7A6000
#7A6000
oklch(50.1% 0.102 90.2)
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 #4257C1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.042
- Iris #6258C4 ΔE 0.045
- Mid Blue #276AB3 ΔE 0.059
- Blue With A Hint Of Purple #533CC6 ΔE 0.061
- Dark Periwinkle #665FD1 ΔE 0.061
- Slate Blue #6A5ACD ΔE 0.061
- Bluey Purple #6241C7 ΔE 0.063
- Royal Blue #4169E1 ΔE 0.064
Use #4257C1 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.