#3D78E0
Closest named color: Royal Blue (#4169E1). oklch(58.8% 0.17 260.8), rgb(61, 120, 224).
Aa
Black text reads best on this color (4.96:1).
About this color
#3D78E0 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.170 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.038 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.96:1 |
| White text | 4.23:1 |
Values
| HEX | #3D78E0 |
| RGB | rgb(61, 120, 224) |
| HSL | hsl(218, 72%, 56%) |
| OKLCH | oklch(58.8% 0.17 260.8) |
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 #3D78E0 | 4.23:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #3D78E0 | 4.96:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #3D78E0 text on white | 4.23:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #3D78E0 text on black | 4.96:1 | AA | Lc -32.8 | 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 600.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A5C2F3
oklch(81% 0.077 260.8)
-
Step 400
400
#74A0ED
oklch(70.6% 0.123 261.1)
-
Step 500
500
#5087E7
oklch(63.2% 0.156 260.7)
-
Step 600
600 (this color)
#3D78E0
oklch(58.8% 0.17 260.8)
-
Step 700
700
#265BB9
oklch(49.1% 0.159 260.9)
-
Step 800
800
#214B95
oklch(42.6% 0.131 260.8)
-
Step 900
900
#203F77
oklch(37.6% 0.103 261.2)
-
Step 950
950
#132646
oklch(27.1% 0.065 260.2)
#3D78E0 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) | #4183E4 | 0.030 |
| Deuteranopia (no green cones) | #1874DE | 0.027 |
| Tritanopia (no blue cones) | #0091A1 | 0.135 |
| Achromatopsia (no color) | #7B7B7B | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D78E0
#3D78E0
oklch(58.8% 0.17 260.8)
- #A17300
#A17300
oklch(58.7% 0.121 80.7)
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 #3D78E0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.038
- Clear Blue #247AFD ΔE 0.045
- Cerulean Blue #056EEE ΔE 0.047
- Windows Blue #3778BF ΔE 0.052
- Water Blue #0E87CC ΔE 0.058
- Dark Sky Blue #448EE4 ΔE 0.060
- Neon Blue #4361EE ΔE 0.061
- Cornflower #6A79F7 ΔE 0.061
Use #3D78E0 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.