#5371AB
Closest named color: Flat Blue (#3C73A8). oklch(55.1% 0.097 262.8), rgb(83, 113, 171).
Aa
White text reads best on this color (4.86:1).
About this color
#5371AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.097 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.025 away. White text reads best on it, at 4.86:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.31:1 |
| White text | 4.86:1 |
Values
| HEX | #5371AB |
| RGB | rgb(83, 113, 171) |
| HSL | hsl(220, 35%, 50%) |
| OKLCH | oklch(55.1% 0.097 262.8) |
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 #5371AB | 4.86:1 | AA | Lc -79.0 | Fine for body text |
| Black text on #5371AB | 4.31:1 | AA large text | Lc 30.5 | Non-text elements, placeholder text |
| #5371AB text on white | 4.86:1 | AA | Lc 73.6 | Content text, not long reading |
| #5371AB text on black | 4.31:1 | AA large text | Lc -28.1 | 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 600.
-
Step 50
50
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D1DAEA
oklch(88.6% 0.024 262.1)
-
Step 300
300
#B2C1DE
oklch(80.9% 0.044 263.6)
-
Step 400
400
#89A1CD
oklch(70.7% 0.07 262.4)
-
Step 500
500
#6C89C0
oklch(63% 0.09 262.7)
-
Step 600
600 (this color)
#5371AB
oklch(55.1% 0.097 262.8)
-
Step 700
700
#456094
oklch(49.2% 0.09 262.7)
-
Step 800
800
#394E78
oklch(42.6% 0.075 263.3)
-
Step 900
900
#314161
oklch(37.7% 0.059 263.5)
-
Step 950
950
#1D2639
oklch(27% 0.038 264.5)
#5371AB 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) | #5B76AD | 0.018 |
| Deuteranopia (no green cones) | #506EAA | 0.010 |
| Tritanopia (no blue cones) | #2A7E86 | 0.088 |
| Achromatopsia (no color) | #717171 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5371AB
#5371AB
oklch(55.1% 0.097 262.8)
- #8E6C24
#8E6C24
oklch(55.2% 0.097 82.5)
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 #5371AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.025
- French Blue #436BAD ΔE 0.027
- Dull Blue #49759C ΔE 0.031
- Muted Blue #3B719F ΔE 0.033
- Windows Blue #3778BF ΔE 0.039
- Stormy Blue #507B9C ΔE 0.042
- Cerulean #457B9D ΔE 0.043
- Steel Blue #4682B4 ΔE 0.047
Use #5371AB 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.