#3F55BD
Closest named color: Warm Blue (#4B57DB). oklch(49.2% 0.165 270.2), rgb(63, 85, 189).
Aa
White text reads best on this color (6.47:1).
About this color
#3F55BD is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.165 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.050 away. White text reads best on it, at 6.47:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.24:1 |
| White text | 6.47:1 |
Values
| HEX | #3F55BD |
| RGB | rgb(63, 85, 189) |
| HSL | hsl(230, 50%, 49%) |
| OKLCH | oklch(49.2% 0.165 270.2) |
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 #3F55BD | 6.47:1 | AA | Lc -86.8 | Fine for body text |
| Black text on #3F55BD | 3.24:1 | AA large text | Lc 22.3 | Dividers and decoration only |
| #3F55BD text on white | 6.47:1 | AA | Lc 81.7 | Fine for body text |
| #3F55BD text on black | 3.24:1 | AA large text | Lc -20.2 | 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
#E4EAFA
oklch(93.7% 0.023 269.4)
-
Step 200
200
#CED8F7
oklch(88.4% 0.044 271.3)
-
Step 300
300
#ADBFF5
oklch(81% 0.079 270.3)
-
Step 400
400
#829BF0
oklch(70.6% 0.128 270.4)
-
Step 500
500
#6480EB
oklch(63% 0.163 270.1)
-
Step 600
600
#4D67D9
oklch(55.6% 0.177 270.1)
-
Step 700
700 (this color)
#3F55BD
oklch(49.2% 0.165 270.2)
-
Step 800
800
#344699
oklch(42.8% 0.137 270.4)
-
Step 900
900
#2C3C79
oklch(37.7% 0.105 269.7)
-
Step 950
950
#1A2347
oklch(26.9% 0.068 270.7)
#3F55BD 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) | #0064C1 | 0.048 |
| Deuteranopia (no green cones) | #0059BB | 0.041 |
| Tritanopia (no blue cones) | #006E81 | 0.135 |
| Achromatopsia (no color) | #5E5E5E | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F55BD
#3F55BD
oklch(49.2% 0.165 270.2)
- #775E00
#775E00
oklch(49.3% 0.101 90.6)
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 #3F55BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.050
- Iris #6258C4 ΔE 0.051
- Blue With A Hint Of Purple #533CC6 ΔE 0.059
- Blue Blue #2242C7 ΔE 0.060
- Mid Blue #276AB3 ΔE 0.060
- Bluey Purple #6241C7 ΔE 0.065
- Blurple #5539CC ΔE 0.067
- Majorelle Blue #3F37C9 ΔE 0.067
Use #3F55BD 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.