#3B55CB
Closest named color: Warm Blue (#4B57DB). oklch(50.1% 0.185 269.2), rgb(59, 85, 203).
Aa
White text reads best on this color (6.27:1).
About this color
#3B55CB is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.185 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.033 away. White text reads best on it, at 6.27:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.34:1 |
| White text | 6.27:1 |
Values
| HEX | #3B55CB |
| RGB | rgb(59, 85, 203) |
| HSL | hsl(229, 58%, 51%) |
| OKLCH | oklch(50.1% 0.185 269.2) |
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 #3B55CB | 6.27:1 | AA | Lc -85.9 | Fine for body text |
| Black text on #3B55CB | 3.34:1 | AA large text | Lc 23.3 | Dividers and decoration only |
| #3B55CB text on white | 6.27:1 | AA | Lc 80.7 | Fine for body text |
| #3B55CB text on black | 3.34:1 | AA large text | Lc -21.1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3EAFC
oklch(93.7% 0.025 268.8)
-
Step 200
200
#CCD8FB
oklch(88.4% 0.05 270.4)
-
Step 300
300
#A9BFFB
oklch(81% 0.089 268.8)
-
Step 400
400
#7C9BFA
oklch(70.7% 0.144 268.9)
-
Step 500
500
#5E7EF7
oklch(63.1% 0.184 269.4)
-
Step 600
600
#4664E6
oklch(55.6% 0.199 269.1)
-
Step 700
700 (this color)
#3B55CB
oklch(50.1% 0.185 269.2)
-
Step 800
800
#2F44A1
oklch(42.7% 0.152 269.3)
-
Step 900
900
#293A80
oklch(37.6% 0.12 269.6)
-
Step 950
950
#18234B
oklch(27.1% 0.075 269.3)
#3B55CB 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) | #0067CF | 0.049 |
| Deuteranopia (no green cones) | #005AC9 | 0.035 |
| Tritanopia (no blue cones) | #007288 | 0.147 |
| Achromatopsia (no color) | #606060 | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B55CB
#3B55CB
oklch(50.1% 0.185 269.2)
- #7B6000
#7B6000
oklch(50.2% 0.103 89.4)
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 #3B55CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.033
- Blue Blue #2242C7 ΔE 0.055
- Iris #6258C4 ΔE 0.055
- Azul #1D5DEC ΔE 0.056
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
- Royal Blue #4169E1 ΔE 0.059
- Neon Blue #4361EE ΔE 0.062
- Majorelle Blue #3F37C9 ΔE 0.063
Use #3B55CB 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.