#3678F0
Closest named color: Clear Blue (#247AFD). oklch(59.7% 0.193 261.2), rgb(54, 120, 240).
Aa
Black text reads best on this color (5.10:1).
About this color
#3678F0 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.193 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.021 away. Black text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.193) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.10:1 |
| White text | 4.11:1 |
Values
| HEX | #3678F0 |
| RGB | rgb(54, 120, 240) |
| HSL | hsl(219, 86%, 58%) |
| OKLCH | oklch(59.7% 0.193 261.2) |
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 #3678F0 | 4.11:1 | AA large text | Lc -73.3 | Content text, not long reading |
| Black text on #3678F0 | 5.10:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #3678F0 text on white | 4.11:1 | AA large text | Lc 67.8 | Content text, not long reading |
| #3678F0 text on black | 5.10:1 | AA | Lc -33.9 | 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
#E0EBFD
oklch(93.7% 0.027 260.3)
-
Step 200
200
#C6DAFD
oklch(88.5% 0.053 261.7)
-
Step 300
300
#9EC1FE
oklch(80.8% 0.095 261.3)
-
Step 400
400
#699FFE
oklch(70.7% 0.151 261)
-
Step 500
500 (this color)
#3678F0
oklch(59.7% 0.193 261.2)
-
Step 600
600
#2069EB
oklch(55.7% 0.209 261.1)
-
Step 700
700
#1256CD
oklch(49.1% 0.196 261.1)
-
Step 800
800
#1347A5
oklch(42.6% 0.161 261.2)
-
Step 900
900
#173D83
oklch(37.7% 0.126 261.3)
-
Step 950
950
#0E244D
oklch(26.9% 0.081 261.5)
#3678F0 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) | #2C86F4 | 0.035 |
| Deuteranopia (no green cones) | #0075EE | 0.025 |
| Tritanopia (no blue cones) | #0095A9 | 0.150 |
| Achromatopsia (no color) | #7D7D7D | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3678F0
#3678F0
oklch(59.7% 0.193 261.2)
- #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 #3678F0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.021
- Cerulean Blue #056EEE ΔE 0.037
- Royal Blue #4169E1 ΔE 0.041
- Neon Blue #4361EE ΔE 0.054
- Cornflower #6A79F7 ΔE 0.055
- Bright Blue #0165FC ΔE 0.059
- Dodger Blue #1E90FF ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.066
Use #3678F0 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.