#4277B0
Closest named color: Flat Blue (#3C73A8). oklch(55.9% 0.106 251.8), rgb(66, 119, 176).
Aa
White text reads best on this color (4.66:1).
About this color
#4277B0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.106 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.017 away. White text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.49:1 |
| White text | 4.66:1 |
Values
| HEX | #4277B0 |
| RGB | rgb(66, 119, 176) |
| HSL | hsl(211, 45%, 47%) |
| OKLCH | oklch(55.9% 0.106 251.8) |
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 #4277B0 | 4.66:1 | AA | Lc -77.7 | Fine for body text |
| Black text on #4277B0 | 4.49:1 | AA large text | Lc 31.8 | Non-text elements, placeholder text |
| #4277B0 text on white | 4.66:1 | AA | Lc 72.2 | Content text, not long reading |
| #4277B0 text on black | 4.49:1 | AA large text | Lc -29.4 | 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
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CDDBEB
oklch(88.6% 0.027 251.7)
-
Step 300
300
#ABC3DF
oklch(80.8% 0.048 252.4)
-
Step 400
400
#7EA4CF
oklch(70.7% 0.076 252)
-
Step 500
500
#5C8DC3
oklch(63.1% 0.098 251.8)
-
Step 600
600 (this color)
#4277B0
oklch(55.9% 0.106 251.8)
-
Step 700
700
#336397
oklch(49.1% 0.099 252.1)
-
Step 800
800
#2B517A
oklch(42.7% 0.081 251.8)
-
Step 900
900
#274362
oklch(37.6% 0.063 252.1)
-
Step 950
950
#17283A
oklch(27.1% 0.041 250.8)
#4277B0 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) | #5F7AB2 | 0.035 |
| Deuteranopia (no green cones) | #506FAF | 0.025 |
| Tritanopia (no blue cones) | #00848B | 0.086 |
| Achromatopsia (no color) | #747474 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4277B0
#4277B0
oklch(55.9% 0.106 251.8)
- #9A6821
#9A6821
oklch(55.8% 0.106 71.2)
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 #4277B0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.017
- Windows Blue #3778BF ΔE 0.024
- Nice Blue #107AB0 ΔE 0.030
- Muted Blue #3B719F ΔE 0.031
- Dull Blue #49759C ΔE 0.031
- Steel Blue #4682B4 ΔE 0.032
- French Blue #436BAD ΔE 0.034
- Cerulean #457B9D ΔE 0.035
Use #4277B0 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.