#3551BF
Closest named color: Blue Blue (#2242C7). oklch(48.1% 0.175 268.2), rgb(53, 81, 191).
Aa
White text reads best on this color (6.81:1).
About this color
#3551BF is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.175 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.044 away. White text reads best on it, at 6.81:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.175) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 3.08:1 |
| White text | 6.81:1 |
Values
| HEX | #3551BF |
| RGB | rgb(53, 81, 191) |
| HSL | hsl(228, 57%, 48%) |
| OKLCH | oklch(48.1% 0.175 268.2) |
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 #3551BF | 6.81:1 | AA | Lc -88.1 | Fine for body text |
| Black text on #3551BF | 3.08:1 | AA large text | Lc 21.0 | Dividers and decoration only |
| #3551BF text on white | 6.81:1 | AA | Lc 83.0 | Fine for body text |
| #3551BF text on black | 3.08:1 | AA large text | Lc -18.9 | 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
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#A9BFF8
oklch(80.8% 0.085 268.1)
-
Step 400
400
#7D9CF5
oklch(70.7% 0.135 268.3)
-
Step 500
500
#5D80F1
oklch(63% 0.174 268.2)
-
Step 600
600
#4566E0
oklch(55.5% 0.189 268.2)
-
Step 700
700 (this color)
#3551BF
oklch(48.1% 0.175 268.2)
-
Step 800
800
#2E469D
oklch(42.8% 0.144 268.1)
-
Step 900
900
#283C7D
oklch(37.8% 0.113 267.8)
-
Step 950
950
#182349
oklch(26.9% 0.072 269)
#3551BF 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) | #0061C3 | 0.044 |
| Deuteranopia (no green cones) | #0055BD | 0.031 |
| Tritanopia (no blue cones) | #006C80 | 0.140 |
| Achromatopsia (no color) | #5B5B5B | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3551BF
#3551BF
oklch(48.1% 0.175 268.2)
- #755A00
#755A00
oklch(48.2% 0.098 88.3)
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 #3551BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.044
- Warm Blue #4B57DB ΔE 0.055
- Majorelle Blue #3F37C9 ΔE 0.056
- Blue With A Hint Of Purple #533CC6 ΔE 0.056
- Blurple #5539CC ΔE 0.064
- Iris #6258C4 ΔE 0.066
- Bluey Purple #6241C7 ΔE 0.069
- Mid Blue #276AB3 ΔE 0.070
Use #3551BF 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.