#3377D0
Closest named color: Windows Blue (#3778BF). oklch(57.2% 0.153 256.5), rgb(51, 119, 208).
Aa
Black text reads best on this color (4.69:1).
About this color
#3377D0 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.153 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.027 away. Black text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.69:1 |
| White text | 4.47:1 |
Values
| HEX | #3377D0 |
| RGB | rgb(51, 119, 208) |
| HSL | hsl(214, 63%, 51%) |
| OKLCH | oklch(57.2% 0.153 256.5) |
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 #3377D0 | 4.47:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #3377D0 | 4.69:1 | AA | Lc 33.4 | Non-text elements, placeholder text |
| #3377D0 text on white | 4.47:1 | AA large text | Lc 70.7 | Content text, not long reading |
| #3377D0 text on black | 4.69:1 | AA | Lc -31.0 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C9DBF3
oklch(88.5% 0.038 255.6)
-
Step 300
300
#A4C3ED
oklch(80.9% 0.069 256.1)
-
Step 400
400
#72A3E5
oklch(70.8% 0.111 256.1)
-
Step 500
500
#4C8ADD
oklch(63.1% 0.141 256.4)
-
Step 600
600 (this color)
#3377D0
oklch(57.2% 0.153 256.5)
-
Step 700
700
#205FAF
oklch(49% 0.142 256.4)
-
Step 800
800
#1D4E8E
oklch(42.7% 0.118 256.6)
-
Step 900
900
#1E4171
oklch(37.6% 0.092 256.9)
-
Step 950
950
#122742
oklch(27.1% 0.057 255.5)
#3377D0 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) | #4B7FD3 | 0.033 |
| Deuteranopia (no green cones) | #2E70CE | 0.020 |
| Tritanopia (no blue cones) | #008C99 | 0.118 |
| Achromatopsia (no color) | #777777 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3377D0
#3377D0
oklch(57.2% 0.153 256.5)
- #9F6D00
#9F6D00
oklch(57.2% 0.12 77)
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 #3377D0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.027
- Water Blue #0E87CC ΔE 0.046
- Royal Blue #4169E1 ΔE 0.047
- Mid Blue #276AB3 ΔE 0.056
- Nice Blue #107AB0 ΔE 0.057
- Cerulean Blue #056EEE ΔE 0.058
- French Blue #436BAD ΔE 0.058
- Steel Blue #4682B4 ΔE 0.061
Use #3377D0 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.