#5571AA
Closest named color: Flat Blue (#3C73A8). oklch(55.2% 0.095 263.6), rgb(85, 113, 170).
Aa
White text reads best on this color (4.85:1).
About this color
#5571AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.095 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.027 away. White text reads best on it, at 4.85:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.32:1 |
| White text | 4.85:1 |
Values
| HEX | #5571AA |
| RGB | rgb(85, 113, 170) |
| HSL | hsl(220, 33%, 50%) |
| OKLCH | oklch(55.2% 0.095 263.6) |
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 #5571AA | 4.85:1 | AA | Lc -79.0 | Fine for body text |
| Black text on #5571AA | 4.32:1 | AA large text | Lc 30.5 | Non-text elements, placeholder text |
| #5571AA text on white | 4.85:1 | AA | Lc 73.5 | Content text, not long reading |
| #5571AA text on black | 4.32:1 | AA large text | Lc -28.2 | 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 600.
-
Step 50
50
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D1D9E9
oklch(88.4% 0.024 264.4)
-
Step 300
300
#B2C1DD
oklch(80.9% 0.043 263)
-
Step 400
400
#8BA1CC
oklch(70.8% 0.068 263.6)
-
Step 500
500
#6E89BF
oklch(63.1% 0.088 263.6)
-
Step 600
600 (this color)
#5571AA
oklch(55.2% 0.095 263.6)
-
Step 700
700
#466093
oklch(49.2% 0.088 263)
-
Step 800
800
#3A4E77
oklch(42.7% 0.073 263.8)
-
Step 900
900
#324160
oklch(37.7% 0.057 264.1)
-
Step 950
950
#1D2638
oklch(26.9% 0.036 263.7)
#5571AA 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) | #5B76AC | 0.017 |
| Deuteranopia (no green cones) | #526EA9 | 0.010 |
| Tritanopia (no blue cones) | #307D86 | 0.084 |
| Achromatopsia (no color) | #717171 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5571AA
#5571AA
oklch(55.2% 0.095 263.6)
- #8D6D27
#8D6D27
oklch(55.3% 0.095 83.6)
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 #5571AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.027
- French Blue #436BAD ΔE 0.030
- Dull Blue #49759C ΔE 0.031
- Muted Blue #3B719F ΔE 0.034
- Stormy Blue #507B9C ΔE 0.041
- Windows Blue #3778BF ΔE 0.042
- Cerulean #457B9D ΔE 0.043
- Steel Blue #4682B4 ΔE 0.047
Use #5571AA 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.