#3F6EDA
Closest named color: Royal Blue (#4169E1). oklch(56.4% 0.173 264), rgb(63, 110, 218).
Aa
White text reads best on this color (4.71:1).
About this color
#3F6EDA is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.173 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.017 away. White text reads best on it, at 4.71:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.45:1 |
| White text | 4.71:1 |
Values
| HEX | #3F6EDA |
| RGB | rgb(63, 110, 218) |
| HSL | hsl(222, 68%, 55%) |
| OKLCH | oklch(56.4% 0.173 264) |
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 #3F6EDA | 4.71:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #3F6EDA | 4.45:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #3F6EDA text on white | 4.71:1 | AA | Lc 72.3 | Content text, not long reading |
| #3F6EDA text on black | 4.45:1 | AA large text | Lc -29.3 | Dividers and decoration only |
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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CBDAF7
oklch(88.6% 0.043 263.7)
-
Step 300
300
#A7C1F4
oklch(80.9% 0.078 263.6)
-
Step 400
400
#789FEF
oklch(70.8% 0.125 263.7)
-
Step 500
500
#5784E9
oklch(63% 0.16 264.2)
-
Step 600
600 (this color)
#3F6EDA
oklch(56.4% 0.173 264)
-
Step 700
700
#2F59BB
oklch(49.1% 0.162 263.9)
-
Step 800
800
#284997
oklch(42.6% 0.134 264.2)
-
Step 900
900
#243E78
oklch(37.6% 0.104 263.9)
-
Step 950
950
#152546
oklch(27% 0.065 263.2)
#3F6EDA 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) | #2F7BDE | 0.033 |
| Deuteranopia (no green cones) | #006DD8 | 0.033 |
| Tritanopia (no blue cones) | #00889A | 0.139 |
| Achromatopsia (no color) | #737373 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6EDA
#3F6EDA
oklch(56.4% 0.173 264)
- #956E00
#956E00
oklch(56.2% 0.115 83.9)
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 #3F6EDA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.017
- Cerulean Blue #056EEE ΔE 0.041
- Neon Blue #4361EE ΔE 0.045
- Windows Blue #3778BF ΔE 0.053
- Warm Blue #4B57DB ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.055
- Clear Blue #247AFD ΔE 0.058
- Azul #1D5DEC ΔE 0.060
Use #3F6EDA 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.