#3F6DF3
Closest named color: Neon Blue (#4361EE). oklch(58% 0.208 265.8), rgb(63, 109, 243).
Aa
Black text reads best on this color (4.69:1).
About this color
#3F6DF3 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.208 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.028 away. Black text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.208) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.69:1 |
| White text | 4.47:1 |
Values
| HEX | #3F6DF3 |
| RGB | rgb(63, 109, 243) |
| HSL | hsl(225, 88%, 60%) |
| OKLCH | oklch(58% 0.208 265.8) |
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 #3F6DF3 | 4.47:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #3F6DF3 | 4.69:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #3F6DF3 text on white | 4.47:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #3F6DF3 text on black | 4.69:1 | AA | Lc -31.1 | 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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FC
oklch(88.5% 0.051 265.9)
-
Step 300
300
#A4C0FE
oklch(81% 0.093 265.6)
-
Step 400
400
#749CFD
oklch(70.6% 0.149 265.8)
-
Step 500
500
#5280FB
oklch(63.1% 0.19 265.8)
-
Step 600
600 (this color)
#3F6DF3
oklch(58% 0.208 265.8)
-
Step 700
700
#2C53CC
oklch(49.2% 0.193 265.8)
-
Step 800
800
#2545A5
oklch(42.8% 0.159 265.8)
-
Step 900
900
#223B83
oklch(37.7% 0.125 266.1)
-
Step 950
950
#14234C
oklch(26.9% 0.078 266.1)
#3F6DF3 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) | #0080F8 | 0.048 |
| Deuteranopia (no green cones) | #006FF0 | 0.031 |
| Tritanopia (no blue cones) | #008EA5 | 0.165 |
| Achromatopsia (no color) | #777777 | 0.208 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6DF3
#3F6DF3
oklch(58% 0.208 265.8)
- #9A7400
#9A7400
oklch(58.1% 0.119 85.6)
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 #3F6DF3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.028
- Royal Blue #4169E1 ΔE 0.028
- Cerulean Blue #056EEE ΔE 0.031
- Clear Blue #247AFD ΔE 0.034
- Bright Blue #0165FC ΔE 0.042
- Azul #1D5DEC ΔE 0.051
- Cornflower #6A79F7 ΔE 0.060
- Warm Blue #4B57DB ΔE 0.061
Use #3F6DF3 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.