#3778EE
Closest named color: Clear Blue (#247AFD). oklch(59.6% 0.19 261.1), rgb(55, 120, 238).
Aa
Black text reads best on this color (5.08:1).
About this color
#3778EE is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.190 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.024 away. Black text reads best on it, at 5.08:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.190) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.08:1 |
| White text | 4.13:1 |
Values
| HEX | #3778EE |
| RGB | rgb(55, 120, 238) |
| HSL | hsl(219, 84%, 57%) |
| OKLCH | oklch(59.6% 0.19 261.1) |
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 #3778EE | 4.13:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #3778EE | 5.08:1 | AA | Lc 36.2 | Non-text elements, placeholder text |
| #3778EE text on white | 4.13:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #3778EE text on black | 5.08:1 | AA | Lc -33.8 | 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 500.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9FC1FD
oklch(80.8% 0.093 261.6)
-
Step 400
400
#6A9FFD
oklch(70.7% 0.149 261.1)
-
Step 500
500 (this color)
#3778EE
oklch(59.6% 0.19 261.1)
-
Step 600
600
#2269E9
oklch(55.6% 0.206 261.2)
-
Step 700
700
#1456CB
oklch(49% 0.193 261.2)
-
Step 800
800
#1448A4
oklch(42.8% 0.158 261)
-
Step 900
900
#173D82
oklch(37.6% 0.124 261.1)
-
Step 950
950
#0F254C
oklch(27.1% 0.078 260.9)
#3778EE 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) | #2F86F2 | 0.035 |
| Deuteranopia (no green cones) | #0075EC | 0.026 |
| Tritanopia (no blue cones) | #0094A8 | 0.147 |
| Achromatopsia (no color) | #7D7D7D | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3778EE
#3778EE
oklch(59.6% 0.19 261.1)
- #A47600
#A47600
oklch(59.6% 0.123 81.3)
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 #3778EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.024
- Cerulean Blue #056EEE ΔE 0.037
- Royal Blue #4169E1 ΔE 0.040
- Neon Blue #4361EE ΔE 0.054
- Cornflower #6A79F7 ΔE 0.055
- Bright Blue #0165FC ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.064
Use #3778EE 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.