#3378D4
Closest named color: Windows Blue (#3778BF). oklch(57.7% 0.157 256.8), rgb(51, 120, 212).
Aa
Black text reads best on this color (4.77:1).
About this color
#3378D4 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.157 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.033 away. Black text reads best on it, at 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.77:1 |
| White text | 4.39:1 |
Values
| HEX | #3378D4 |
| RGB | rgb(51, 120, 212) |
| HSL | hsl(214, 65%, 52%) |
| OKLCH | oklch(57.7% 0.157 256.8) |
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 #3378D4 | 4.39:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #3378D4 | 4.77:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #3378D4 text on white | 4.39:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #3378D4 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF4
oklch(88.6% 0.04 256.6)
-
Step 300
300
#A4C3EF
oklch(81% 0.071 257.1)
-
Step 400
400
#72A2E7
oklch(70.6% 0.114 257.4)
-
Step 500
500
#4B8ADF
oklch(63.2% 0.144 256.5)
-
Step 600
600 (this color)
#3378D4
oklch(57.7% 0.157 256.8)
-
Step 700
700
#1F5FB1
oklch(49.1% 0.145 256.6)
-
Step 800
800
#1C4E90
oklch(42.8% 0.121 256.8)
-
Step 900
900
#1D4173
oklch(37.7% 0.095 257.2)
-
Step 950
950
#122743
oklch(27.1% 0.059 256.2)
#3378D4 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) | #4A80D8 | 0.032 |
| Deuteranopia (no green cones) | #2B72D2 | 0.018 |
| Tritanopia (no blue cones) | #008E9B | 0.123 |
| Achromatopsia (no color) | #787878 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3378D4
#3378D4
oklch(57.7% 0.157 256.8)
- #A16E00
#A16E00
oklch(57.7% 0.121 76.7)
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 #3378D4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.033
- Royal Blue #4169E1 ΔE 0.045
- Water Blue #0E87CC ΔE 0.046
- Cerulean Blue #056EEE ΔE 0.054
- Clear Blue #247AFD ΔE 0.062
- Nice Blue #107AB0 ΔE 0.062
- Mid Blue #276AB3 ΔE 0.062
- Cool Blue #4984B8 ΔE 0.063
Use #3378D4 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.