#3178ED
Closest named color: Clear Blue (#247AFD). oklch(59.3% 0.191 260), rgb(49, 120, 237).
Aa
Black text reads best on this color (5.04:1).
About this color
#3178ED is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.191 and its hue 260°. 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 5.04:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.191) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.04:1 |
| White text | 4.16:1 |
Values
| HEX | #3178ED |
| RGB | rgb(49, 120, 237) |
| HSL | hsl(217, 84%, 56%) |
| OKLCH | oklch(59.3% 0.191 260) |
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 #3178ED | 4.16:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #3178ED | 5.04:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #3178ED text on white | 4.16:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #3178ED text on black | 5.04:1 | AA | Lc -33.5 | 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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A0C2F8
oklch(80.9% 0.085 259.5)
-
Step 400
400
#6DA0F5
oklch(70.7% 0.137 260.2)
-
Step 500
500
#4586F1
oklch(63.2% 0.174 259.9)
-
Step 600
600 (this color)
#3178ED
oklch(59.3% 0.191 260)
-
Step 700
700
#1859C3
oklch(49% 0.178 260.2)
-
Step 800
800
#164A9D
oklch(42.7% 0.146 259.8)
-
Step 900
900
#193F7D
oklch(37.8% 0.114 259.8)
-
Step 950
950
#102549
oklch(26.9% 0.072 260.4)
#3178ED 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) | #2F85F1 | 0.033 |
| Deuteranopia (no green cones) | #0074EB | 0.023 |
| Tritanopia (no blue cones) | #0094A7 | 0.147 |
| Achromatopsia (no color) | #7C7C7C | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3178ED
#3178ED
oklch(59.3% 0.191 260)
- #A47400
#A47400
oklch(59.2% 0.123 79.7)
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 #3178ED, 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 0.034
- Royal Blue #4169E1 ΔE 0.039
- Neon Blue #4361EE ΔE 0.054
- Bright Blue #0165FC ΔE 0.059
- Cornflower #6A79F7 ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.063
- Dark Sky Blue #448EE4 ΔE 0.065
Use #3178ED 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.