#3F55C0
Closest named color: Warm Blue (#4B57DB). oklch(49.5% 0.169 270.3), rgb(63, 85, 192).
Aa
White text reads best on this color (6.41:1).
About this color
#3F55C0 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.169 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.045 away. White text reads best on it, at 6.41:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.27:1 |
| White text | 6.41:1 |
Values
| HEX | #3F55C0 |
| RGB | rgb(63, 85, 192) |
| HSL | hsl(230, 51%, 50%) |
| OKLCH | oklch(49.5% 0.169 270.3) |
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 #3F55C0 | 6.41:1 | AA | Lc -86.6 | Fine for body text |
| Black text on #3F55C0 | 3.27:1 | AA large text | Lc 22.6 | Dividers and decoration only |
| #3F55C0 text on white | 6.41:1 | AA | Lc 81.5 | Fine for body text |
| #3F55C0 text on black | 3.27:1 | AA large text | Lc -20.4 | 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 700.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CDD8F8
oklch(88.4% 0.046 270.4)
-
Step 300
300
#ACBFF6
oklch(81% 0.081 269.7)
-
Step 400
400
#819BF2
oklch(70.6% 0.131 270.2)
-
Step 500
500
#6480ED
oklch(63.2% 0.166 270.2)
-
Step 600
600
#4D66DC
oklch(55.6% 0.182 270.4)
-
Step 700
700 (this color)
#3F55C0
oklch(49.5% 0.169 270.3)
-
Step 800
800
#33459A
oklch(42.6% 0.14 270.4)
-
Step 900
900
#2C3B7B
oklch(37.7% 0.11 270.4)
-
Step 950
950
#1A2348
oklch(27% 0.07 270.8)
#3F55C0 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) | #0065C4 | 0.049 |
| Deuteranopia (no green cones) | #0059BE | 0.041 |
| Tritanopia (no blue cones) | #006F82 | 0.139 |
| Achromatopsia (no color) | #5F5F5F | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F55C0
#3F55C0
oklch(49.5% 0.169 270.3)
- #785E00
#785E00
oklch(49.4% 0.101 89.8)
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 #3F55C0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.045
- Iris #6258C4 ΔE 0.051
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
- Blue Blue #2242C7 ΔE 0.059
- Mid Blue #276AB3 ΔE 0.062
- Bluey Purple #6241C7 ΔE 0.063
- Blurple #5539CC ΔE 0.065
- Majorelle Blue #3F37C9 ΔE 0.066
Use #3F55C0 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.