#3F73F3
Closest named color: Clear Blue (#247AFD). oklch(59.2% 0.2 264.4), rgb(63, 115, 243).
Aa
Black text reads best on this color (4.95:1).
About this color
#3F73F3 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.200 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.025 away. Black text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.200) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 4.95:1 |
| White text | 4.23:1 |
Values
| HEX | #3F73F3 |
| RGB | rgb(63, 115, 243) |
| HSL | hsl(223, 88%, 60%) |
| OKLCH | oklch(59.2% 0.2 264.4) |
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 #3F73F3 | 4.23:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #3F73F3 | 4.95:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #3F73F3 text on white | 4.23:1 | AA large text | Lc 68.7 | Content text, not long reading |
| #3F73F3 text on black | 4.95:1 | AA | Lc -32.9 | 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 600.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C9D9FB
oklch(88.4% 0.05 265.4)
-
Step 300
300
#A4C0FC
oklch(80.9% 0.091 265)
-
Step 400
400
#739DFA
oklch(70.6% 0.144 264.6)
-
Step 500
500
#4F82F7
oklch(63.1% 0.183 264.1)
-
Step 600
600 (this color)
#3F73F3
oklch(59.2% 0.2 264.4)
-
Step 700
700
#2855C8
oklch(49.1% 0.186 264.3)
-
Step 800
800
#2246A2
oklch(42.6% 0.155 264.5)
-
Step 900
900
#203C80
oklch(37.6% 0.12 264.5)
-
Step 950
950
#13244B
oklch(27% 0.076 264.2)
#3F73F3 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) | #0E84F8 | 0.044 |
| Deuteranopia (no green cones) | #0073F0 | 0.030 |
| Tritanopia (no blue cones) | #0092A8 | 0.158 |
| Achromatopsia (no color) | #7B7B7B | 0.201 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F73F3
#3F73F3
oklch(59.2% 0.2 264.4)
- #9F7600
#9F7600
oklch(59.1% 0.121 84.2)
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 #3F73F3, closest first.
No curated palette has a color within ΔE 0.04 of #3F73F3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.025
- Royal Blue #4169E1 ΔE 0.035
- Cerulean Blue #056EEE ΔE 0.036
- Neon Blue #4361EE ΔE 0.042
- Cornflower #6A79F7 ΔE 0.052
- Bright Blue #0165FC ΔE 0.052
- Azul #1D5DEC ΔE 0.063
- Dodger Blue #1E90FF ΔE 0.072
Use #3F73F3 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.