#3F6DF9
Closest named color: Neon Blue (#4361EE). oklch(58.5% 0.215 266), rgb(63, 109, 249).
Aa
Black text reads best on this color (4.76:1).
About this color
#3F6DF9 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.215 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.031 away. Black text reads best on it, at 4.76:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.215) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.76:1 |
| White text | 4.40:1 |
Values
| HEX | #3F6DF9 |
| RGB | rgb(63, 109, 249) |
| HSL | hsl(225, 94%, 61%) |
| OKLCH | oklch(58.5% 0.215 266) |
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 #3F6DF9 | 4.40:1 | AA large text | Lc -75.5 | Fine for body text |
| Black text on #3F6DF9 | 4.76:1 | AA | Lc 34.1 | Non-text elements, placeholder text |
| #3F6DF9 text on white | 4.40:1 | AA large text | Lc 70.0 | Content text, not long reading |
| #3F6DF9 text on black | 4.76:1 | AA | Lc -31.7 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FE
oklch(88.5% 0.054 266.8)
-
Step 300
300
#A4C0FF
oklch(81% 0.095 265.8)
-
Step 400
400
#749CFF
oklch(70.8% 0.152 266)
-
Step 500
500
#517FFF
oklch(63.2% 0.197 266)
-
Step 600
600 (this color)
#3F6DF9
oklch(58.5% 0.215 266)
-
Step 700
700
#2B51D0
oklch(49.1% 0.201 266.1)
-
Step 800
800
#2443A8
oklch(42.6% 0.166 266.2)
-
Step 900
900
#213A85
oklch(37.6% 0.13 266.3)
-
Step 950
950
#13234E
oklch(27% 0.082 265.8)
#3F6DF9 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) | #0081FE | 0.050 |
| Deuteranopia (no green cones) | #0070F6 | 0.030 |
| Tritanopia (no blue cones) | #0090A8 | 0.171 |
| Achromatopsia (no color) | #787878 | 0.216 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6DF9
#3F6DF9
oklch(58.5% 0.215 266)
- #9B7500
#9B7500
oklch(58.4% 0.12 85.8)
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 #3F6DF9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.031
- Clear Blue #247AFD ΔE 0.032
- Cerulean Blue #056EEE ΔE 0.035
- Royal Blue #4169E1 ΔE 0.037
- Bright Blue #0165FC ΔE 0.040
- Azul #1D5DEC ΔE 0.054
- Cornflower #6A79F7 ΔE 0.060
- Warm Blue #4B57DB ΔE 0.066
Use #3F6DF9 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.