#3F55C5
Closest named color: Warm Blue (#4B57DB). oklch(49.8% 0.176 270.3), rgb(63, 85, 197).
Aa
White text reads best on this color (6.33:1).
About this color
#3F55C5 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.176 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.038 away. White text reads best on it, at 6.33:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.176) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.31:1 |
| White text | 6.33:1 |
Values
| HEX | #3F55C5 |
| RGB | rgb(63, 85, 197) |
| HSL | hsl(230, 54%, 51%) |
| OKLCH | oklch(49.8% 0.176 270.3) |
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 #3F55C5 | 6.33:1 | AA | Lc -86.2 | Fine for body text |
| Black text on #3F55C5 | 3.31:1 | AA large text | Lc 23.0 | Dividers and decoration only |
| #3F55C5 text on white | 6.33:1 | AA | Lc 81.1 | Fine for body text |
| #3F55C5 text on black | 3.31:1 | AA large text | Lc -20.8 | 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
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8F9
oklch(88.4% 0.047 270.8)
-
Step 300
300
#ABBEF8
oklch(80.8% 0.085 270.4)
-
Step 400
400
#809BF5
oklch(70.7% 0.135 270)
-
Step 500
500
#627FF1
oklch(63.1% 0.173 270.1)
-
Step 600
600
#4B65E0
oklch(55.6% 0.189 270.1)
-
Step 700
700 (this color)
#3F55C5
oklch(49.8% 0.176 270.3)
-
Step 800
800
#32449D
oklch(42.6% 0.146 270.4)
-
Step 900
900
#2B3B7D
oklch(37.7% 0.113 270)
-
Step 950
950
#192349
oklch(27% 0.072 270)
#3F55C5 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) | #0066C9 | 0.050 |
| Deuteranopia (no green cones) | #005AC3 | 0.040 |
| Tritanopia (no blue cones) | #007085 | 0.142 |
| Achromatopsia (no color) | #606060 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F55C5
#3F55C5
oklch(49.8% 0.176 270.3)
- #795F00
#795F00
oklch(49.8% 0.102 90)
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 #3F55C5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.038
- Iris #6258C4 ΔE 0.050
- Blue With A Hint Of Purple #533CC6 ΔE 0.057
- Blue Blue #2242C7 ΔE 0.058
- Bluey Purple #6241C7 ΔE 0.062
- Blurple #5539CC ΔE 0.063
- Royal Blue #4169E1 ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.064
Use #3F55C5 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.