#5171AA
Closest named color: Flat Blue (#3C73A8). oklch(55% 0.097 261.4), rgb(81, 113, 170).
Aa
White text reads best on this color (4.89:1).
About this color
#5171AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.097 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.022 away. White text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.29:1 |
| White text | 4.89:1 |
Values
| HEX | #5171AA |
| RGB | rgb(81, 113, 170) |
| HSL | hsl(218, 35%, 49%) |
| OKLCH | oklch(55% 0.097 261.4) |
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 #5171AA | 4.89:1 | AA | Lc -79.2 | Fine for body text |
| Black text on #5171AA | 4.29:1 | AA large text | Lc 30.3 | Non-text elements, placeholder text |
| #5171AA text on white | 4.89:1 | AA | Lc 73.8 | Content text, not long reading |
| #5171AA text on black | 4.29:1 | AA large text | Lc -27.9 | 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 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
#D0DAEA
oklch(88.6% 0.025 259.8)
-
Step 300
300
#B1C1DE
oklch(80.8% 0.045 262.4)
-
Step 400
400
#88A1CD
oklch(70.6% 0.071 261.6)
-
Step 500
500
#6B8AC0
oklch(63.2% 0.089 261.2)
-
Step 600
600 (this color)
#5171AA
oklch(55% 0.097 261.4)
-
Step 700
700
#436094
oklch(49.1% 0.091 261.4)
-
Step 800
800
#384F78
oklch(42.8% 0.074 261.4)
-
Step 900
900
#304261
oklch(37.8% 0.058 260.9)
-
Step 950
950
#1C2739
oklch(27.1% 0.037 260)
#5171AA 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) | #5B75AC | 0.018 |
| Deuteranopia (no green cones) | #506DA9 | 0.011 |
| Tritanopia (no blue cones) | #257D86 | 0.086 |
| Achromatopsia (no color) | #717171 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5171AA
#5171AA
oklch(55% 0.097 261.4)
- #8E6B24
#8E6B24
oklch(55% 0.097 81.5)
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 #5171AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.022
- French Blue #436BAD ΔE 0.026
- Dull Blue #49759C ΔE 0.029
- Muted Blue #3B719F ΔE 0.030
- Windows Blue #3778BF ΔE 0.039
- Stormy Blue #507B9C ΔE 0.041
- Cerulean #457B9D ΔE 0.041
- Steel Blue #4682B4 ΔE 0.047
Use #5171AA 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.