#3555D1
Closest named color: Warm Blue (#4B57DB). oklch(50.3% 0.194 267.6), rgb(53, 85, 209).
Aa
White text reads best on this color (6.22:1).
About this color
#3555D1 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.194 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.031 away. White text reads best on it, at 6.22:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.194) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.37:1 |
| White text | 6.22:1 |
Values
| HEX | #3555D1 |
| RGB | rgb(53, 85, 209) |
| HSL | hsl(228, 63%, 51%) |
| OKLCH | oklch(50.3% 0.194 267.6) |
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 #3555D1 | 6.22:1 | AA | Lc -85.6 | Fine for body text |
| Black text on #3555D1 | 3.37:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #3555D1 text on white | 6.22:1 | AA | Lc 80.5 | Fine for body text |
| #3555D1 text on black | 3.37:1 | AA large text | Lc -21.4 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CAD9FD
oklch(88.6% 0.052 267.4)
-
Step 300
300
#A6BFFE
oklch(80.9% 0.094 267.6)
-
Step 400
400
#789BFE
oklch(70.7% 0.15 267.8)
-
Step 500
500
#577EFC
oklch(63.1% 0.192 267.7)
-
Step 600
600
#3F63EB
oklch(55.5% 0.209 267.6)
-
Step 700
700 (this color)
#3555D1
oklch(50.3% 0.194 267.6)
-
Step 800
800
#2943A5
oklch(42.6% 0.161 267.6)
-
Step 900
900
#253A83
oklch(37.7% 0.125 267.8)
-
Step 950
950
#16234D
oklch(27.1% 0.079 267.9)
#3555D1 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) | #0068D5 | 0.048 |
| Deuteranopia (no green cones) | #005ACF | 0.029 |
| Tritanopia (no blue cones) | #00748B | 0.152 |
| Achromatopsia (no color) | #616161 | 0.195 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3555D1
#3555D1
oklch(50.3% 0.194 267.6)
- #7D6000
#7D6000
oklch(50.4% 0.103 88)
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 #3555D1, closest first.
No curated palette has a color within ΔE 0.04 of #3555D1.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.031
- Azul #1D5DEC ΔE 0.046
- Blue Blue #2242C7 ΔE 0.053
- Neon Blue #4361EE ΔE 0.056
- Royal Blue #4169E1 ΔE 0.057
- Blue With A Hint Of Purple #533CC6 ΔE 0.063
- Majorelle Blue #3F37C9 ΔE 0.063
- Iris #6258C4 ΔE 0.063
Use #3555D1 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.