#3178EA
Closest named color: Clear Blue (#247AFD). oklch(59.1% 0.187 259.7), rgb(49, 120, 234).
Aa
Black text reads best on this color (5.00:1).
About this color
#3178EA is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.187 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.029 away. Black text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.187) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.00:1 |
| White text | 4.19:1 |
Values
| HEX | #3178EA |
| RGB | rgb(49, 120, 234) |
| HSL | hsl(217, 81%, 55%) |
| OKLCH | oklch(59.1% 0.187 259.7) |
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 #3178EA | 4.19:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #3178EA | 5.00:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #3178EA text on white | 4.19:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #3178EA 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
#E1EBFB
oklch(93.7% 0.024 259.8)
-
Step 200
200
#C7DAF9
oklch(88.4% 0.048 260.2)
-
Step 300
300
#A1C2F7
oklch(80.9% 0.084 259.8)
-
Step 400
400
#6DA0F4
oklch(70.6% 0.135 260)
-
Step 500
500
#4586EF
oklch(63% 0.171 259.6)
-
Step 600
600 (this color)
#3178EA
oklch(59.1% 0.187 259.7)
-
Step 700
700
#185AC1
oklch(49.1% 0.174 259.7)
-
Step 800
800
#174A9C
oklch(42.6% 0.144 259.8)
-
Step 900
900
#193F7C
oklch(37.7% 0.112 259.6)
-
Step 950
950
#102548
oklch(26.9% 0.071 260)
#3178EA 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) | #3485EE | 0.034 |
| Deuteranopia (no green cones) | #0074E8 | 0.024 |
| Tritanopia (no blue cones) | #0093A6 | 0.143 |
| Achromatopsia (no color) | #7C7C7C | 0.187 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3178EA
#3178EA
oklch(59.1% 0.187 259.7)
- #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 #3178EA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.029
- Cerulean Blue #056EEE ΔE 0.035
- Royal Blue #4169E1 ΔE 0.038
- Neon Blue #4361EE ΔE 0.055
- Bright Blue #0165FC ΔE 0.061
- Cornflower #6A79F7 ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.064
- Dodger Blue #1E90FF ΔE 0.065
Use #3178EA 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.