#4255CF
Closest named color: Warm Blue (#4B57DB). oklch(50.8% 0.188 271.3), rgb(66, 85, 207).
Aa
White text reads best on this color (6.11:1).
About this color
#4255CF is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.188 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.023 away. White text reads best on it, at 6.11:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.188) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.43:1 |
| White text | 6.11:1 |
Values
| HEX | #4255CF |
| RGB | rgb(66, 85, 207) |
| HSL | hsl(232, 59%, 54%) |
| OKLCH | oklch(50.8% 0.188 271.3) |
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 #4255CF | 6.11:1 | AA | Lc -85.2 | Fine for body text |
| Black text on #4255CF | 3.43:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #4255CF text on white | 6.11:1 | AA | Lc 80.1 | Fine for body text |
| #4255CF text on black | 3.43:1 | AA large text | Lc -21.8 | 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 700.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FC
oklch(88.5% 0.051 271.9)
-
Step 300
300
#ABBEFC
oklch(80.9% 0.09 271.1)
-
Step 400
400
#8099FB
oklch(70.6% 0.146 271.4)
-
Step 500
500
#627CF8
oklch(63% 0.186 271.2)
-
Step 600
600
#4C62E7
oklch(55.7% 0.201 271.2)
-
Step 700
700 (this color)
#4255CF
oklch(50.8% 0.188 271.3)
-
Step 800
800
#3342A3
oklch(42.7% 0.157 271.4)
-
Step 900
900
#2C3981
oklch(37.7% 0.122 271.6)
-
Step 950
950
#19224B
oklch(26.9% 0.077 271.1)
#4255CF 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) | #0068D3 | 0.054 |
| Deuteranopia (no green cones) | #005CCD | 0.043 |
| Tritanopia (no blue cones) | #00738A | 0.152 |
| Achromatopsia (no color) | #626262 | 0.189 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4255CF
#4255CF
oklch(50.8% 0.188 271.3)
- #7C6200
#7C6200
oklch(50.8% 0.104 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 #4255CF, closest first.
No curated palette has a color within ΔE 0.04 of #4255CF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.023
- Iris #6258C4 ΔE 0.049
- Azul #1D5DEC ΔE 0.054
- Royal Blue #4169E1 ΔE 0.054
- Neon Blue #4361EE ΔE 0.055
- Blue With A Hint Of Purple #533CC6 ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.058
- Slate Blue #6A5ACD ΔE 0.059
Use #4255CF 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.