#3555B5
Closest named color: Mid Blue (#276AB3). oklch(48.1% 0.157 266.6), rgb(53, 85, 181).
Aa
White text reads best on this color (6.73:1).
About this color
#3555B5 is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.157 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.056 away. White text reads best on it, at 6.73:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.11:1 |
| White text | 6.73:1 |
Values
| HEX | #3555B5 |
| RGB | rgb(53, 85, 181) |
| HSL | hsl(225, 55%, 46%) |
| OKLCH | oklch(48.1% 0.157 266.6) |
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 #3555B5 | 6.73:1 | AA | Lc -87.8 | Fine for body text |
| Black text on #3555B5 | 3.11:1 | AA large text | Lc 21.2 | Dividers and decoration only |
| #3555B5 text on white | 6.73:1 | AA | Lc 82.8 | Fine for body text |
| #3555B5 text on black | 3.11:1 | AA large text | Lc -19.1 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F6
oklch(88.5% 0.042 266.3)
-
Step 300
300
#AAC0F3
oklch(80.9% 0.076 266.5)
-
Step 400
400
#7E9EED
oklch(70.8% 0.122 266.6)
-
Step 500
500
#5E83E7
oklch(63.1% 0.156 266.7)
-
Step 600
600
#466AD5
oklch(55.5% 0.169 266.8)
-
Step 700
700 (this color)
#3555B5
oklch(48.1% 0.157 266.6)
-
Step 800
800
#2E4995
oklch(42.8% 0.129 266.3)
-
Step 900
900
#293E77
oklch(37.8% 0.101 266.4)
-
Step 950
950
#182446
oklch(26.9% 0.065 267.3)
#3555B5 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) | #1362B8 | 0.037 |
| Deuteranopia (no green cones) | #0056B3 | 0.031 |
| Tritanopia (no blue cones) | #006C7D | 0.126 |
| Achromatopsia (no color) | #5C5C5C | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3555B5
#3555B5
oklch(48.1% 0.157 266.6)
- #765900
#765900
oklch(48.1% 0.098 86.5)
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 #3555B5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.056
- Blue Blue #2242C7 ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.061
- Warm Blue #4B57DB ΔE 0.066
- Iris #6258C4 ΔE 0.066
- French Blue #436BAD ΔE 0.067
- Dusky Blue #475F94 ΔE 0.067
- Dusk Blue #26538D ΔE 0.067
Use #3555B5 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.