#3550B9
Closest named color: Blue Blue (#2242C7). oklch(47.4% 0.169 268.3), rgb(53, 80, 185).
Aa
White text reads best on this color (7.00:1).
About this color
#3550B9 is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.169 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.046 away. White text reads best on it, at 7.00:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.99:1 |
| White text | 7.00:1 |
Values
| HEX | #3550B9 |
| RGB | rgb(53, 80, 185) |
| HSL | hsl(228, 55%, 47%) |
| OKLCH | oklch(47.4% 0.169 268.3) |
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 #3550B9 | 7.00:1 | AAA | Lc -88.8 | Fine for body text |
| Black text on #3550B9 | 2.99:1 | Fails | Lc 20.2 | Dividers and decoration only |
| #3550B9 text on white | 7.00:1 | AAA | Lc 83.8 | Fine for body text |
| #3550B9 text on black | 2.99:1 | Fails | Lc -18.2 | 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
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F8
oklch(88.5% 0.045 267.4)
-
Step 300
300
#AABFF6
oklch(80.8% 0.082 268.3)
-
Step 400
400
#7E9CF2
oklch(70.6% 0.131 268.4)
-
Step 500
500
#5F81ED
oklch(63.1% 0.166 268.2)
-
Step 600
600
#4767DC
oklch(55.5% 0.182 268.3)
-
Step 700
700 (this color)
#3550B9
oklch(47.4% 0.169 268.3)
-
Step 800
800
#2F469A
oklch(42.6% 0.14 268.3)
-
Step 900
900
#293C7B
oklch(37.7% 0.11 268.2)
-
Step 950
950
#182448
oklch(27.1% 0.069 267.8)
#3550B9 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) | #005FBD | 0.043 |
| Deuteranopia (no green cones) | #0053B7 | 0.032 |
| Tritanopia (no blue cones) | #006A7C | 0.137 |
| Achromatopsia (no color) | #595959 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3550B9
#3550B9
oklch(47.4% 0.169 268.3)
- #725800
#725800
oklch(47.4% 0.097 88.7)
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 #3550B9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.046
- Majorelle Blue #3F37C9 ΔE 0.058
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
- Warm Blue #4B57DB ΔE 0.063
- Blurple #5539CC ΔE 0.067
- Blueberry #464196 ΔE 0.067
- Sapphire #2138AB ΔE 0.069
- Iris #6258C4 ΔE 0.069
Use #3550B9 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.