#5173AC
Closest named color: Flat Blue (#3C73A8). oklch(55.5% 0.098 260.3), rgb(81, 115, 172).
Aa
White text reads best on this color (4.77:1).
About this color
#5173AC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.098 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.023 away. White text reads best on it, at 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.39:1 |
| White text | 4.77:1 |
Values
| HEX | #5173AC |
| RGB | rgb(81, 115, 172) |
| HSL | hsl(218, 36%, 50%) |
| OKLCH | oklch(55.5% 0.098 260.3) |
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 #5173AC | 4.77:1 | AA | Lc -78.5 | Fine for body text |
| Black text on #5173AC | 4.39:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #5173AC text on white | 4.77:1 | AA | Lc 73.0 | Content text, not long reading |
| #5173AC text on black | 4.39:1 | AA large text | Lc -28.7 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D0DAEA
oklch(88.6% 0.025 259.8)
-
Step 300
300
#B1C2DE
oklch(81% 0.044 260.4)
-
Step 400
400
#87A2CD
oklch(70.8% 0.07 259.6)
-
Step 500
500
#6A8AC0
oklch(63.1% 0.09 260.6)
-
Step 600
600 (this color)
#5173AC
oklch(55.5% 0.098 260.3)
-
Step 700
700
#426094
oklch(49% 0.091 260.9)
-
Step 800
800
#364F78
oklch(42.7% 0.075 259.9)
-
Step 900
900
#2F4261
oklch(37.8% 0.059 259.9)
-
Step 950
950
#1C2739
oklch(27.1% 0.037 260)
#5173AC 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) | #5D77AE | 0.020 |
| Deuteranopia (no green cones) | #526FAB | 0.011 |
| Tritanopia (no blue cones) | #227F88 | 0.086 |
| Achromatopsia (no color) | #737373 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5173AC
#5173AC
oklch(55.5% 0.098 260.3)
- #916C26
#916C26
oklch(55.5% 0.098 79.9)
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 #5173AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.023
- Dull Blue #49759C ΔE 0.030
- French Blue #436BAD ΔE 0.030
- Muted Blue #3B719F ΔE 0.033
- Windows Blue #3778BF ΔE 0.036
- Stormy Blue #507B9C ΔE 0.039
- Cerulean #457B9D ΔE 0.039
- Steel Blue #4682B4 ΔE 0.041
Use #5173AC 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.