#4255B3
Closest named color: Iris (#6258C4). oklch(48.6% 0.15 271.2), rgb(66, 85, 179).
Aa
White text reads best on this color (6.59:1).
About this color
#4255B3 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.150 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.054 away. White text reads best on it, at 6.59:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.18:1 |
| White text | 6.59:1 |
Values
| HEX | #4255B3 |
| RGB | rgb(66, 85, 179) |
| HSL | hsl(230, 46%, 48%) |
| OKLCH | oklch(48.6% 0.15 271.2) |
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 #4255B3 | 6.59:1 | AA | Lc -87.4 | Fine for body text |
| Black text on #4255B3 | 3.18:1 | AA large text | Lc 21.7 | Dividers and decoration only |
| #4255B3 text on white | 6.59:1 | AA | Lc 82.3 | Fine for body text |
| #4255B3 text on black | 3.18:1 | AA large text | Lc -19.6 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4E9F8
oklch(93.5% 0.021 271.2)
-
Step 200
200
#CFD8F5
oklch(88.4% 0.041 271.9)
-
Step 300
300
#AFBFF0
oklch(80.9% 0.072 270.6)
-
Step 400
400
#869CE9
oklch(70.7% 0.116 271.1)
-
Step 500
500
#6981E3
oklch(63.1% 0.15 271.2)
-
Step 600
600
#5269D0
oklch(55.7% 0.16 270.9)
-
Step 700
700 (this color)
#4255B3
oklch(48.6% 0.15 271.2)
-
Step 800
800
#374792
oklch(42.7% 0.124 271.2)
-
Step 900
900
#2F3C74
oklch(37.6% 0.097 271.2)
-
Step 950
950
#1C2444
oklch(27.1% 0.06 271.3)
#4255B3 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) | #1C62B6 | 0.043 |
| Deuteranopia (no green cones) | #0058B1 | 0.045 |
| Tritanopia (no blue cones) | #006B7C | 0.127 |
| Achromatopsia (no color) | #5D5D5D | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4255B3
#4255B3
oklch(48.6% 0.15 271.2)
- #745C00
#745C00
oklch(48.5% 0.099 91)
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 #4255B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.054
- Mid Blue #276AB3 ΔE 0.058
- Denim Blue #3B5B92 ΔE 0.059
- Dusky Blue #475F94 ΔE 0.061
- French Blue #436BAD ΔE 0.062
- Warm Blue #4B57DB ΔE 0.064
- Twilight #4E518B ΔE 0.065
- Blue With A Hint Of Purple #533CC6 ΔE 0.065
Use #4255B3 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.