#4277B4
Closest named color: Windows Blue (#3778BF). oklch(56.1% 0.111 253.3), rgb(66, 119, 180).
Aa
White text reads best on this color (4.63:1).
About this color
#4277B4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.111 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.018 away. White text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.52:1 |
| White text | 4.63:1 |
Values
| HEX | #4277B4 |
| RGB | rgb(66, 119, 180) |
| HSL | hsl(212, 46%, 48%) |
| OKLCH | oklch(56.1% 0.111 253.3) |
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 #4277B4 | 4.63:1 | AA | Lc -77.5 | Fine for body text |
| Black text on #4277B4 | 4.52:1 | AA | Lc 32.1 | Non-text elements, placeholder text |
| #4277B4 text on white | 4.63:1 | AA | Lc 72.0 | Content text, not long reading |
| #4277B4 text on black | 4.52:1 | AA | Lc -29.7 | 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 600.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CDDBEC
oklch(88.6% 0.028 253.2)
-
Step 300
300
#ABC3E1
oklch(80.9% 0.05 254.1)
-
Step 400
400
#7DA4D2
oklch(70.8% 0.08 253)
-
Step 500
500
#5B8CC6
oklch(63% 0.103 253.5)
-
Step 600
600 (this color)
#4277B4
oklch(56.1% 0.111 253.3)
-
Step 700
700
#32639A
oklch(49.2% 0.103 253)
-
Step 800
800
#2A517C
oklch(42.8% 0.085 252.4)
-
Step 900
900
#274364
oklch(37.7% 0.066 253.5)
-
Step 950
950
#17273B
oklch(26.9% 0.043 254.6)
#4277B4 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) | #5D7BB7 | 0.033 |
| Deuteranopia (no green cones) | #4D70B3 | 0.021 |
| Tritanopia (no blue cones) | #00858D | 0.090 |
| Achromatopsia (no color) | #757575 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4277B4
#4277B4
oklch(56.1% 0.111 253.3)
- #9B6917
#9B6917
oklch(56% 0.111 73.6)
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 #4277B4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.018
- Flat Blue #3C73A8 ΔE 0.022
- Nice Blue #107AB0 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.033
- French Blue #436BAD ΔE 0.034
- Muted Blue #3B719F ΔE 0.036
- Dull Blue #49759C ΔE 0.037
- Cool Blue #4984B8 ΔE 0.038
Use #4277B4 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.