#3378E9
Closest named color: Clear Blue (#247AFD). oklch(59.1% 0.185 259.9), rgb(51, 120, 233).
Aa
Black text reads best on this color (5.00:1).
About this color
#3378E9 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.185 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.030 away. Black text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.00:1 |
| White text | 4.19:1 |
Values
| HEX | #3378E9 |
| RGB | rgb(51, 120, 233) |
| HSL | hsl(217, 81%, 56%) |
| OKLCH | oklch(59.1% 0.185 259.9) |
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 #3378E9 | 4.19:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #3378E9 | 5.00:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #3378E9 text on white | 4.19:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #3378E9 text on black | 5.00:1 | AA | Lc -33.2 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A1C2F7
oklch(80.9% 0.084 259.8)
-
Step 400
400
#6EA0F3
oklch(70.6% 0.134 260.1)
-
Step 500
500
#4786EE
oklch(63% 0.17 259.9)
-
Step 600
600 (this color)
#3378E9
oklch(59.1% 0.185 259.9)
-
Step 700
700
#1B5AC0
oklch(49.1% 0.172 260)
-
Step 800
800
#194A9B
oklch(42.6% 0.143 260.1)
-
Step 900
900
#1A3F7B
oklch(37.6% 0.111 259.7)
-
Step 950
950
#102548
oklch(26.9% 0.071 260)
#3378E9 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) | #3584ED | 0.031 |
| Deuteranopia (no green cones) | #0074E7 | 0.025 |
| Tritanopia (no blue cones) | #0093A5 | 0.143 |
| Achromatopsia (no color) | #7C7C7C | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3378E9
#3378E9
oklch(59.1% 0.185 259.9)
- #A37400
#A37400
oklch(59.1% 0.122 80.3)
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 #3378E9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.030
- Cerulean Blue #056EEE ΔE 0.036
- Royal Blue #4169E1 ΔE 0.038
- Neon Blue #4361EE ΔE 0.056
- Cornflower #6A79F7 ΔE 0.061
- Bright Blue #0165FC ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.064
- Windows Blue #3778BF ΔE 0.065
Use #3378E9 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.