#5173AF
Closest named color: Flat Blue (#3C73A8). oklch(55.7% 0.102 261.2), rgb(81, 115, 175).
Aa
White text reads best on this color (4.74:1).
About this color
#5173AF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.102 and its hue 261°. 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 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #5173AF |
| RGB | rgb(81, 115, 175) |
| HSL | hsl(218, 37%, 50%) |
| OKLCH | oklch(55.7% 0.102 261.2) |
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 #5173AF | 4.74:1 | AA | Lc -78.3 | Fine for body text |
| Black text on #5173AF | 4.42:1 | AA large text | Lc 31.2 | Non-text elements, placeholder text |
| #5173AF text on white | 4.74:1 | AA | Lc 72.8 | Content text, not long reading |
| #5173AF text on black | 4.42:1 | AA large text | Lc -28.8 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
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
#B0C2DF
oklch(81% 0.046 259.9)
-
Step 400
400
#87A1CF
oklch(70.6% 0.074 261.7)
-
Step 500
500
#698AC2
oklch(63.2% 0.093 260.7)
-
Step 600
600 (this color)
#5173AF
oklch(55.7% 0.102 261.2)
-
Step 700
700
#416096
oklch(49.1% 0.095 260.9)
-
Step 800
800
#364F7A
oklch(42.8% 0.078 260.7)
-
Step 900
900
#2F4262
oklch(37.8% 0.06 260.5)
-
Step 950
950
#1C2639
oklch(26.9% 0.038 262.7)
#5173AF 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) | #5B78B1 | 0.020 |
| Deuteranopia (no green cones) | #506FAE | 0.011 |
| Tritanopia (no blue cones) | #1F8089 | 0.090 |
| Achromatopsia (no color) | #737373 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5173AF
#5173AF
oklch(55.7% 0.102 261.2)
- #926C20
#926C20
oklch(55.6% 0.102 80.5)
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 #5173AF, 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 0.029
- Windows Blue #3778BF ΔE 0.033
- Dull Blue #49759C ΔE 0.034
- Muted Blue #3B719F ΔE 0.036
- Steel Blue #4682B4 ΔE 0.041
- Stormy Blue #507B9C ΔE 0.043
- Cerulean #457B9D ΔE 0.043
Use #5173AF 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.