#3378F3
Closest named color: Clear Blue (#247AFD). oklch(59.8% 0.198 260.9), rgb(51, 120, 243).
Aa
Black text reads best on this color (5.12:1).
About this color
#3378F3 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.198 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.016 away. Black text reads best on it, at 5.12:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.198) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.12:1 |
| White text | 4.10:1 |
Values
| HEX | #3378F3 |
| RGB | rgb(51, 120, 243) |
| HSL | hsl(218, 89%, 58%) |
| OKLCH | oklch(59.8% 0.198 260.9) |
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 #3378F3 | 4.10:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #3378F3 | 5.12:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #3378F3 text on white | 4.10:1 | AA large text | Lc 67.6 | Content text, not long reading |
| #3378F3 text on black | 5.12:1 | AA | Lc -34.1 | 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 500.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DAFD
oklch(88.4% 0.054 260.6)
-
Step 300
300
#9EC2FF
oklch(81% 0.095 260.8)
-
Step 400
400
#689FFF
oklch(70.7% 0.153 260.8)
-
Step 500
500 (this color)
#3378F3
oklch(59.8% 0.198 260.9)
-
Step 600
600
#1B68EE
oklch(55.6% 0.215 261)
-
Step 700
700
#0C55CF
oklch(49% 0.2 261)
-
Step 800
800
#0F47A7
oklch(42.7% 0.165 260.9)
-
Step 900
900
#143D85
oklch(37.8% 0.129 260.8)
-
Step 950
950
#0D244E
oklch(27% 0.083 261.2)
#3378F3 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) | #2687F7 | 0.037 |
| Deuteranopia (no green cones) | #0075F1 | 0.023 |
| Tritanopia (no blue cones) | #0096AA | 0.153 |
| Achromatopsia (no color) | #7D7D7D | 0.198 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3378F3
#3378F3
oklch(59.8% 0.198 260.9)
- #A57600
#A57600
oklch(59.8% 0.124 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 #3378F3, closest first.
No curated palette has a color within ΔE 0.04 of #3378F3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.016
- Cerulean Blue #056EEE ΔE 0.036
- Royal Blue #4169E1 ΔE 0.043
- Neon Blue #4361EE ΔE 0.054
- Cornflower #6A79F7 ΔE 0.056
- Bright Blue #0165FC ΔE 0.056
- Dodger Blue #1E90FF ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.068
Use #3378F3 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.