#3F65DD
Closest named color: Royal Blue (#4169E1). oklch(54.8% 0.188 266.8), rgb(63, 101, 221).
Aa
White text reads best on this color (5.10:1).
About this color
#3F65DD is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.188 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.012 away. White text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.188) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.11:1 |
| White text | 5.10:1 |
Values
| HEX | #3F65DD |
| RGB | rgb(63, 101, 221) |
| HSL | hsl(226, 70%, 56%) |
| OKLCH | oklch(54.8% 0.188 266.8) |
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 #3F65DD | 5.10:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #3F65DD | 4.11:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #3F65DD text on white | 5.10:1 | AA | Lc 74.7 | Content text, not long reading |
| #3F65DD text on black | 4.11:1 | AA large text | Lc -27.0 | 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
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CBD9F9
oklch(88.5% 0.047 266.7)
-
Step 300
300
#A8C0F8
oklch(81% 0.084 266.5)
-
Step 400
400
#7A9DF5
oklch(70.8% 0.135 266.6)
-
Step 500
500
#5A81F1
oklch(63.1% 0.173 267)
-
Step 600
600 (this color)
#3F65DD
oklch(54.8% 0.188 266.8)
-
Step 700
700
#3455C2
oklch(49.1% 0.175 266.9)
-
Step 800
800
#2B469D
oklch(42.6% 0.145 267)
-
Step 900
900
#263C7D
oklch(37.7% 0.114 266.8)
-
Step 950
950
#162449
oklch(27% 0.071 266.2)
#3F65DD 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) | #0076E1 | 0.047 |
| Deuteranopia (no green cones) | #0067DB | 0.034 |
| Tritanopia (no blue cones) | #008297 | 0.151 |
| Achromatopsia (no color) | #6E6E6E | 0.189 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F65DD
#3F65DD
oklch(54.8% 0.188 266.8)
- #8D6B00
#8D6B00
oklch(54.7% 0.112 86.6)
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 #3F65DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.012
- Neon Blue #4361EE ΔE 0.028
- Warm Blue #4B57DB ΔE 0.033
- Cerulean Blue #056EEE ΔE 0.040
- Azul #1D5DEC ΔE 0.042
- Dark Periwinkle #665FD1 ΔE 0.051
- Bright Blue #0165FC ΔE 0.056
- Iris #6258C4 ΔE 0.061
Use #3F65DD 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.