#3278DB
Closest named color: Royal Blue (#4169E1). oklch(58.1% 0.167 257.8), rgb(50, 120, 219).
Aa
Black text reads best on this color (4.84:1).
About this color
#3278DB is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.167 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.040 away. Black text reads best on it, at 4.84:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.84:1 |
| White text | 4.33:1 |
Values
| HEX | #3278DB |
| RGB | rgb(50, 120, 219) |
| HSL | hsl(215, 70%, 53%) |
| OKLCH | oklch(58.1% 0.167 257.8) |
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 #3278DB | 4.33:1 | AA large text | Lc -75.1 | Fine for body text |
| Black text on #3278DB | 4.84:1 | AA | Lc 34.5 | Non-text elements, placeholder text |
| #3278DB text on white | 4.33:1 | AA large text | Lc 69.6 | Content text, not long reading |
| #3278DB text on black | 4.84:1 | AA | Lc -32.1 | 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
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A3C3F1
oklch(81% 0.074 257.4)
-
Step 400
400
#70A2EB
oklch(70.7% 0.12 257.8)
-
Step 500
500
#4989E5
oklch(63.2% 0.154 257.7)
-
Step 600
600 (this color)
#3278DB
oklch(58.1% 0.167 257.8)
-
Step 700
700
#1C5DB6
oklch(49% 0.155 257.8)
-
Step 800
800
#1A4D94
oklch(42.8% 0.129 257.8)
-
Step 900
900
#1C4176
oklch(37.8% 0.1 257.8)
-
Step 950
950
#112645
oklch(27% 0.064 258.1)
#3278DB 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) | #4482DF | 0.033 |
| Deuteranopia (no green cones) | #1C72D9 | 0.022 |
| Tritanopia (no blue cones) | #00909F | 0.129 |
| Achromatopsia (no color) | #797979 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3278DB
#3278DB
oklch(58.1% 0.167 257.8)
- #A27000
#A27000
oklch(58.2% 0.121 77.7)
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 #3278DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.040
- Windows Blue #3778BF ΔE 0.043
- Cerulean Blue #056EEE ΔE 0.046
- Clear Blue #247AFD ΔE 0.051
- Water Blue #0E87CC ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.063
- Neon Blue #4361EE ΔE 0.065
- Mid Blue #276AB3 ΔE 0.070
Use #3278DB 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.