#3F68DB
Closest named color: Royal Blue (#4169E1). oklch(55.3% 0.182 265.8), rgb(63, 104, 219).
Aa
White text reads best on this color (4.98:1).
About this color
#3F68DB is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.182 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.010 away. White text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.182) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.21:1 |
| White text | 4.98:1 |
Values
| HEX | #3F68DB |
| RGB | rgb(63, 104, 219) |
| HSL | hsl(224, 68%, 55%) |
| OKLCH | oklch(55.3% 0.182 265.8) |
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 #3F68DB | 4.98:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #3F68DB | 4.21:1 | AA large text | Lc 30.0 | Non-text elements, placeholder text |
| #3F68DB text on white | 4.98:1 | AA | Lc 74.0 | Content text, not long reading |
| #3F68DB text on black | 4.21:1 | AA large text | Lc -27.7 | 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
#A8C0F6
oklch(80.9% 0.081 266)
-
Step 400
400
#7A9DF2
oklch(70.6% 0.131 266.1)
-
Step 500
500
#5982EE
oklch(63% 0.168 266.1)
-
Step 600
600 (this color)
#3F68DB
oklch(55.3% 0.182 265.8)
-
Step 700
700
#3257BF
oklch(49.1% 0.169 265.7)
-
Step 800
800
#2A489B
oklch(42.8% 0.14 265.7)
-
Step 900
900
#263D7B
oklch(37.7% 0.109 266)
-
Step 950
950
#162448
oklch(26.9% 0.07 265.9)
#3F68DB 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) | #1677DF | 0.041 |
| Deuteranopia (no green cones) | #0069D9 | 0.033 |
| Tritanopia (no blue cones) | #008497 | 0.147 |
| Achromatopsia (no color) | #707070 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F68DB
#3F68DB
oklch(55.3% 0.182 265.8)
- #906C00
#906C00
oklch(55.2% 0.113 85.4)
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 #3F68DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.010
- Neon Blue #4361EE ΔE 0.034
- Warm Blue #4B57DB ΔE 0.040
- Cerulean Blue #056EEE ΔE 0.040
- Azul #1D5DEC ΔE 0.048
- Dark Periwinkle #665FD1 ΔE 0.051
- Bright Blue #0165FC ΔE 0.059
- Iris #6258C4 ΔE 0.062
Use #3F68DB 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.