#3F64D0
Closest named color: Royal Blue (#4169E1). oklch(53.6% 0.172 266.4), rgb(63, 100, 208).
Aa
White text reads best on this color (5.32:1).
About this color
#3F64D0 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.172 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.028 away. White text reads best on it, at 5.32:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.172) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 3.94:1 |
| White text | 5.32:1 |
Values
| HEX | #3F64D0 |
| RGB | rgb(63, 100, 208) |
| HSL | hsl(225, 61%, 53%) |
| OKLCH | oklch(53.6% 0.172 266.4) |
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 #3F64D0 | 5.32:1 | AA | Lc -81.4 | Fine for body text |
| Black text on #3F64D0 | 3.94:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #3F64D0 text on white | 5.32:1 | AA | Lc 76.1 | Fine for body text |
| #3F64D0 text on black | 3.94:1 | AA large text | Lc -25.6 | 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
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F7
oklch(88.5% 0.044 266.9)
-
Step 300
300
#AAC0F4
oklch(80.9% 0.078 266.8)
-
Step 400
400
#7D9EEE
oklch(70.8% 0.123 266.3)
-
Step 500
500
#5D83E8
oklch(63.1% 0.158 266.4)
-
Step 600
600 (this color)
#3F64D0
oklch(53.6% 0.172 266.4)
-
Step 700
700
#3658BA
oklch(49.1% 0.16 266.2)
-
Step 800
800
#2D4897
oklch(42.7% 0.134 266.5)
-
Step 900
900
#283D78
oklch(37.6% 0.104 266.7)
-
Step 950
950
#172446
oklch(26.9% 0.066 266.3)
#3F64D0 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) | #1D72D4 | 0.039 |
| Deuteranopia (no green cones) | #0065CE | 0.035 |
| Tritanopia (no blue cones) | #007E90 | 0.140 |
| Achromatopsia (no color) | #6B6B6B | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F64D0
#3F64D0
oklch(53.6% 0.172 266.4)
- #896800
#896800
oklch(53.6% 0.11 86.7)
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 #3F64D0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.028
- Warm Blue #4B57DB ΔE 0.037
- Neon Blue #4361EE ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.049
- Iris #6258C4 ΔE 0.052
- Azul #1D5DEC ΔE 0.054
- Mid Blue #276AB3 ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.055
Use #3F64D0 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.