#277DBF
Closest named color: Windows Blue (#3778BF). oklch(57.2% 0.129 246.4), rgb(39, 125, 191).
Aa
Black text reads best on this color (4.77:1).
About this color
#277DBF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.129 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.016 away. Black text reads best on it, at 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.77:1 |
| White text | 4.40:1 |
Values
| HEX | #277DBF |
| RGB | rgb(39, 125, 191) |
| HSL | hsl(206, 66%, 45%) |
| OKLCH | oklch(57.2% 0.129 246.4) |
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 #277DBF | 4.40:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #277DBF | 4.77:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #277DBF text on white | 4.40:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #277DBF text on black | 4.77:1 | AA | Lc -31.6 | Non-text elements, placeholder text |
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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DCEE
oklch(88.6% 0.032 246.7)
-
Step 300
300
#A3C5E5
oklch(80.9% 0.058 247)
-
Step 400
400
#6FA6D8
oklch(70.7% 0.094 247)
-
Step 500
500
#458FCD
oklch(63% 0.119 246.5)
-
Step 600
600 (this color)
#277DBF
oklch(57.2% 0.129 246.4)
-
Step 700
700
#1165A0
oklch(49.1% 0.12 246.2)
-
Step 800
800
#135382
oklch(42.8% 0.099 246)
-
Step 900
900
#194568
oklch(37.8% 0.077 245.9)
-
Step 950
950
#10283D
oklch(26.9% 0.05 247.3)
#277DBF 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) | #5E80C2 | 0.051 |
| Deuteranopia (no green cones) | #4872BE | 0.036 |
| Tritanopia (no blue cones) | #008D95 | 0.092 |
| Achromatopsia (no color) | #787878 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #277DBF
#277DBF
oklch(57.2% 0.129 246.4)
- #A96600
#A96600
oklch(57.2% 0.127 66.3)
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 #277DBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.016
- Nice Blue #107AB0 ΔE 0.027
- Water Blue #0E87CC ΔE 0.030
- Steel Blue #4682B4 ΔE 0.034
- Cool Blue #4984B8 ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.041
- Blue NCS #118AB2 ΔE 0.047
- French Blue #436BAD ΔE 0.053
Use #277DBF 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.