#277AD8
Closest named color: Windows Blue (#3778BF). oklch(58% 0.164 254.7), rgb(39, 122, 216).
Aa
Black text reads best on this color (4.86:1).
About this color
#277AD8 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.164 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.038 away. Black text reads best on it, at 4.86:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.86:1 |
| White text | 4.31:1 |
Values
| HEX | #277AD8 |
| RGB | rgb(39, 122, 216) |
| HSL | hsl(212, 69%, 50%) |
| OKLCH | oklch(58% 0.164 254.7) |
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 #277AD8 | 4.31:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #277AD8 | 4.86:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #277AD8 text on white | 4.31:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #277AD8 text on black | 4.86:1 | AA | Lc -32.3 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C7DBF4
oklch(88.4% 0.041 254)
-
Step 300
300
#A1C4F0
oklch(81% 0.073 254.4)
-
Step 400
400
#6CA3E9
oklch(70.6% 0.119 255)
-
Step 500
500
#428BE2
oklch(63.2% 0.15 254.5)
-
Step 600
600 (this color)
#277AD8
oklch(58% 0.164 254.7)
-
Step 700
700
#0E5FB4
oklch(49% 0.153 254.9)
-
Step 800
800
#114E92
oklch(42.7% 0.127 255)
-
Step 900
900
#174274
oklch(37.8% 0.098 254.5)
-
Step 950
950
#0F2744
oklch(27% 0.062 254.6)
#277AD8 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) | #4982DC | 0.037 |
| Deuteranopia (no green cones) | #2572D6 | 0.022 |
| Tritanopia (no blue cones) | #00909E | 0.123 |
| Achromatopsia (no color) | #7A7A7A | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #277AD8
#277AD8
oklch(58% 0.164 254.7)
- #A46E00
#A46E00
oklch(58% 0.122 75)
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 #277AD8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.038
- Water Blue #0E87CC ΔE 0.043
- Royal Blue #4169E1 ΔE 0.048
- Cerulean Blue #056EEE ΔE 0.050
- Clear Blue #247AFD ΔE 0.056
- Dark Sky Blue #448EE4 ΔE 0.062
- Nice Blue #107AB0 ΔE 0.065
- Cool Blue #4984B8 ΔE 0.067
Use #277AD8 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.