#3378AE
Closest named color: Flat Blue (#3C73A8). oklch(55.4% 0.109 245.3), rgb(51, 120, 174).
Aa
White text reads best on this color (4.73:1).
About this color
#3378AE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.109 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.016 away. White text reads best on it, at 4.73:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.43:1 |
| White text | 4.73:1 |
Values
| HEX | #3378AE |
| RGB | rgb(51, 120, 174) |
| HSL | hsl(206, 55%, 44%) |
| OKLCH | oklch(55.4% 0.109 245.3) |
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 #3378AE | 4.73:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #3378AE | 4.43:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #3378AE text on white | 4.73:1 | AA | Lc 72.6 | Content text, not long reading |
| #3378AE text on black | 4.43:1 | AA large text | Lc -29.1 | 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
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CBDBEA
oklch(88.4% 0.027 246.4)
-
Step 300
300
#A7C5DF
oklch(81% 0.049 244.6)
-
Step 400
400
#77A6CF
oklch(70.7% 0.079 245.5)
-
Step 500
500
#528FC2
oklch(63% 0.1 245.5)
-
Step 600
600 (this color)
#3378AE
oklch(55.4% 0.109 245.3)
-
Step 700
700
#266596
oklch(49% 0.101 245.6)
-
Step 800
800
#21537A
oklch(42.8% 0.084 245.3)
-
Step 900
900
#214562
oklch(37.8% 0.065 245.1)
-
Step 950
950
#142839
oklch(26.9% 0.041 245.8)
#3378AE 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) | #607AB0 | 0.047 |
| Deuteranopia (no green cones) | #4F6EAD | 0.035 |
| Tritanopia (no blue cones) | #00858B | 0.079 |
| Achromatopsia (no color) | #737373 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3378AE
#3378AE
oklch(55.4% 0.109 245.3)
- #9E6421
#9E6421
oklch(55.5% 0.109 65.2)
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 #3378AE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.016
- Nice Blue #107AB0 ΔE 0.017
- Muted Blue #3B719F ΔE 0.027
- Windows Blue #3778BF ΔE 0.027
- Dull Blue #49759C ΔE 0.031
- Cerulean #457B9D ΔE 0.034
- Steel Blue #4682B4 ΔE 0.035
- French Blue #436BAD ΔE 0.037
Use #3378AE 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.