#3F6FEC
Closest named color: Royal Blue (#4169E1). oklch(57.9% 0.196 265), rgb(63, 111, 236).
Aa
Black text reads best on this color (4.69:1).
About this color
#3F6FEC is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.196 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.021 away. Black text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.69:1 |
| White text | 4.47:1 |
Values
| HEX | #3F6FEC |
| RGB | rgb(63, 111, 236) |
| HSL | hsl(223, 82%, 59%) |
| OKLCH | oklch(57.9% 0.196 265) |
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 #3F6FEC | 4.47:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #3F6FEC | 4.69:1 | AA | Lc 33.5 | Non-text elements, placeholder text |
| #3F6FEC text on white | 4.47:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #3F6FEC 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
#F2F6FE
oklch(97.2% 0.012 264.5)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#C9D9FB
oklch(88.4% 0.05 265.4)
-
Step 300
300
#A5C0FA
oklch(80.9% 0.088 265.1)
-
Step 400
400
#759DF8
oklch(70.6% 0.141 265)
-
Step 500
500
#5282F5
oklch(63.1% 0.18 264.7)
-
Step 600
600 (this color)
#3F6FEC
oklch(57.9% 0.196 265)
-
Step 700
700
#2C55C6
oklch(49% 0.182 265.1)
-
Step 800
800
#2547A0
oklch(42.8% 0.15 264.9)
-
Step 900
900
#223C7F
oklch(37.6% 0.118 265.2)
-
Step 950
950
#14244A
oklch(27% 0.074 264.7)
#3F6FEC 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) | #0A7FF0 | 0.043 |
| Deuteranopia (no green cones) | #0070EA | 0.031 |
| Tritanopia (no blue cones) | #008DA3 | 0.155 |
| Achromatopsia (no color) | #777777 | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6FEC
#3F6FEC
oklch(57.9% 0.196 265)
- #9A7300
#9A7300
oklch(57.9% 0.119 84.9)
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 #3F6FEC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.021
- Cerulean Blue #056EEE ΔE 0.030
- Neon Blue #4361EE ΔE 0.033
- Clear Blue #247AFD ΔE 0.036
- Bright Blue #0165FC ΔE 0.049
- Azul #1D5DEC ΔE 0.054
- Cornflower #6A79F7 ΔE 0.060
- Warm Blue #4B57DB ΔE 0.060
Use #3F6FEC 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.