#3F65D9
Closest named color: Royal Blue (#4169E1). oklch(54.5% 0.183 266.6), rgb(63, 101, 217).
Aa
White text reads best on this color (5.15:1).
About this color
#3F65D9 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.183 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.016 away. White text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #3F65D9 |
| RGB | rgb(63, 101, 217) |
| HSL | hsl(225, 67%, 55%) |
| OKLCH | oklch(54.5% 0.183 266.6) |
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 #3F65D9 | 5.15:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #3F65D9 | 4.07:1 | AA large text | Lc 29.0 | Dividers and decoration only |
| #3F65D9 text on white | 5.15:1 | AA | Lc 75.1 | Fine for body text |
| #3F65D9 text on black | 4.07:1 | AA large text | Lc -26.7 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CBD9F8
oklch(88.5% 0.045 266.2)
-
Step 300
300
#A8C0F7
oklch(80.9% 0.083 266.3)
-
Step 400
400
#7B9DF3
oklch(70.7% 0.132 266.7)
-
Step 500
500
#5A82EE
oklch(63.1% 0.168 266.4)
-
Step 600
600 (this color)
#3F65D9
oklch(54.5% 0.183 266.6)
-
Step 700
700
#3456C0
oklch(49.1% 0.171 266.6)
-
Step 800
800
#2B479B
oklch(42.7% 0.141 266.5)
-
Step 900
900
#273D7B
oklch(37.8% 0.109 266.5)
-
Step 950
950
#172448
oklch(27% 0.069 266.8)
#3F65D9 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) | #0875DD | 0.045 |
| Deuteranopia (no green cones) | #0067D7 | 0.034 |
| Tritanopia (no blue cones) | #008195 | 0.147 |
| Achromatopsia (no color) | #6D6D6D | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F65D9
#3F65D9
oklch(54.5% 0.183 266.6)
- #8C6B00
#8C6B00
oklch(54.6% 0.112 87.2)
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 #3F65D9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.016
- Warm Blue #4B57DB ΔE 0.034
- Neon Blue #4361EE ΔE 0.034
- Cerulean Blue #056EEE ΔE 0.044
- Azul #1D5DEC ΔE 0.045
- Dark Periwinkle #665FD1 ΔE 0.050
- Iris #6258C4 ΔE 0.058
- Slate Blue #6A5ACD ΔE 0.060
Use #3F65D9 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.