#3F74F3
Closest named color: Clear Blue (#247AFD). oklch(59.4% 0.199 264.2), rgb(63, 116, 243).
Aa
Black text reads best on this color (5.00:1).
About this color
#3F74F3 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.199 and its hue 264°. 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 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.199) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.00:1 |
| White text | 4.19:1 |
Values
| HEX | #3F74F3 |
| RGB | rgb(63, 116, 243) |
| HSL | hsl(222, 88%, 60%) |
| OKLCH | oklch(59.4% 0.199 264.2) |
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 #3F74F3 | 4.19:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #3F74F3 | 5.00:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #3F74F3 text on white | 4.19:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #3F74F3 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 500.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C7DAFE
oklch(88.6% 0.054 263.2)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500 (this color)
#3F74F3
oklch(59.4% 0.199 264.2)
-
Step 600
600
#2E65EF
oklch(55.6% 0.216 264.1)
-
Step 700
700
#2252D0
oklch(49% 0.201 264.2)
-
Step 800
800
#1D44A8
oklch(42.6% 0.167 264.2)
-
Step 900
900
#1D3B85
oklch(37.7% 0.13 264.4)
-
Step 950
950
#11234E
oklch(26.9% 0.083 264.4)
#3F74F3 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) | #1684F7 | 0.041 |
| Deuteranopia (no green cones) | #0074F0 | 0.030 |
| Tritanopia (no blue cones) | #0093A8 | 0.158 |
| Achromatopsia (no color) | #7C7C7C | 0.199 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F74F3
#3F74F3
oklch(59.4% 0.199 264.2)
- #A07700
#A07700
oklch(59.4% 0.122 84.4)
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 #3F74F3, closest first.
No curated palette has a color within ΔE 0.04 of #3F74F3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.024
- Royal Blue #4169E1 ΔE 0.037
- Cerulean Blue #056EEE ΔE 0.037
- Neon Blue #4361EE ΔE 0.045
- Cornflower #6A79F7 ΔE 0.051
- Bright Blue #0165FC ΔE 0.054
- Azul #1D5DEC ΔE 0.066
- Dodger Blue #1E90FF ΔE 0.069
Use #3F74F3 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.