#3F55C1
Closest named color: Warm Blue (#4B57DB). oklch(49.5% 0.17 270.3), rgb(63, 85, 193).
Aa
White text reads best on this color (6.40:1).
About this color
#3F55C1 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.170 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.044 away. White text reads best on it, at 6.40:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.28:1 |
| White text | 6.40:1 |
Values
| HEX | #3F55C1 |
| RGB | rgb(63, 85, 193) |
| HSL | hsl(230, 51%, 50%) |
| OKLCH | oklch(49.5% 0.17 270.3) |
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 #3F55C1 | 6.40:1 | AA | Lc -86.5 | Fine for body text |
| Black text on #3F55C1 | 3.28:1 | AA large text | Lc 22.7 | Dividers and decoration only |
| #3F55C1 text on white | 6.40:1 | AA | Lc 81.4 | Fine for body text |
| #3F55C1 text on black | 3.28:1 | AA large text | Lc -20.5 | 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
#E3E9FA
oklch(93.5% 0.024 270.3)
-
Step 200
200
#CDD8F8
oklch(88.4% 0.046 270.4)
-
Step 300
300
#ACBFF7
oklch(81% 0.082 270)
-
Step 400
400
#819BF3
oklch(70.7% 0.132 270.3)
-
Step 500
500
#637FEE
oklch(63% 0.169 270.3)
-
Step 600
600
#4C66DD
oklch(55.6% 0.183 270.1)
-
Step 700
700 (this color)
#3F55C1
oklch(49.5% 0.17 270.3)
-
Step 800
800
#33459B
oklch(42.7% 0.141 270.4)
-
Step 900
900
#2C3B7B
oklch(37.7% 0.11 270.4)
-
Step 950
950
#1A2348
oklch(27% 0.07 270.8)
#3F55C1 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) | #0065C5 | 0.049 |
| Deuteranopia (no green cones) | #0059BF | 0.040 |
| Tritanopia (no blue cones) | #006F83 | 0.139 |
| Achromatopsia (no color) | #5F5F5F | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F55C1
#3F55C1
oklch(49.5% 0.17 270.3)
- #785F00
#785F00
oklch(49.6% 0.101 90.8)
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 #3F55C1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.044
- Iris #6258C4 ΔE 0.050
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
- Blue Blue #2242C7 ΔE 0.059
- Mid Blue #276AB3 ΔE 0.063
- Bluey Purple #6241C7 ΔE 0.063
- Blurple #5539CC ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.065
Use #3F55C1 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.