#3551B5
Closest named color: Blue Blue (#2242C7). oklch(47.3% 0.162 267.9), rgb(53, 81, 181).
Aa
White text reads best on this color (7.01:1).
About this color
#3551B5 is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.162 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.051 away. White text reads best on it, at 7.01:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.99:1 |
| White text | 7.01:1 |
Values
| HEX | #3551B5 |
| RGB | rgb(53, 81, 181) |
| HSL | hsl(227, 55%, 46%) |
| OKLCH | oklch(47.3% 0.162 267.9) |
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 #3551B5 | 7.01:1 | AAA | Lc -88.8 | Fine for body text |
| Black text on #3551B5 | 2.99:1 | Fails | Lc 20.2 | Dividers and decoration only |
| #3551B5 text on white | 7.01:1 | AAA | Lc 83.9 | Fine for body text |
| #3551B5 text on black | 2.99:1 | Fails | Lc -18.1 | 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
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CDD9F7
oklch(88.6% 0.043 268.2)
-
Step 300
300
#ABBFF4
oklch(80.8% 0.078 268.5)
-
Step 400
400
#7F9DEF
oklch(70.8% 0.125 267.9)
-
Step 500
500
#6082E9
oklch(63.1% 0.159 267.9)
-
Step 600
600
#4869D8
oklch(55.7% 0.174 267.9)
-
Step 700
700 (this color)
#3551B5
oklch(47.3% 0.162 267.9)
-
Step 800
800
#304797
oklch(42.6% 0.134 268.2)
-
Step 900
900
#2A3D78
oklch(37.7% 0.103 267.8)
-
Step 950
950
#182447
oklch(27% 0.067 267.5)
#3551B5 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) | #005FB8 | 0.042 |
| Deuteranopia (no green cones) | #0053B3 | 0.032 |
| Tritanopia (no blue cones) | #00697B | 0.130 |
| Achromatopsia (no color) | #595959 | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3551B5
#3551B5
oklch(47.3% 0.162 267.9)
- #725700
#725700
oklch(47.2% 0.096 87.7)
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 #3551B5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.051
- Blue With A Hint Of Purple #533CC6 ΔE 0.063
- Blueberry #464196 ΔE 0.063
- Majorelle Blue #3F37C9 ΔE 0.063
- Mid Blue #276AB3 ΔE 0.067
- Denim Blue #3B5B92 ΔE 0.067
- Warm Blue #4B57DB ΔE 0.068
- Dusk Blue #26538D ΔE 0.068
Use #3551B5 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.