#5175AF
Closest named color: Flat Blue (#3C73A8). oklch(56.1% 0.1 259.6), rgb(81, 117, 175).
Aa
White text reads best on this color (4.65:1).
About this color
#5175AF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.100 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.026 away. White text reads best on it, at 4.65:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.51:1 |
| White text | 4.65:1 |
Values
| HEX | #5175AF |
| RGB | rgb(81, 117, 175) |
| HSL | hsl(217, 37%, 50%) |
| OKLCH | oklch(56.1% 0.1 259.6) |
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 #5175AF | 4.65:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #5175AF | 4.51:1 | AA | Lc 31.9 | Non-text elements, placeholder text |
| #5175AF text on white | 4.65:1 | AA | Lc 72.2 | Content text, not long reading |
| #5175AF text on black | 4.51:1 | AA | Lc -29.5 | 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
#B0C2DE
oklch(80.9% 0.044 259.2)
-
Step 400
400
#86A2CE
oklch(70.7% 0.072 259.3)
-
Step 500
500
#688AC1
oklch(63% 0.092 259.8)
-
Step 600
600 (this color)
#5175AF
oklch(56.1% 0.1 259.6)
-
Step 700
700
#406195
oklch(49.2% 0.092 259.2)
-
Step 800
800
#354F79
oklch(42.7% 0.077 259.6)
-
Step 900
900
#2E4261
oklch(37.7% 0.059 258.9)
-
Step 950
950
#1B2739
oklch(27.1% 0.038 258.3)
#5175AF 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) | #5E79B1 | 0.021 |
| Deuteranopia (no green cones) | #5370AE | 0.014 |
| Tritanopia (no blue cones) | #1E828A | 0.089 |
| Achromatopsia (no color) | #747474 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5175AF
#5175AF
oklch(56.1% 0.1 259.6)
- #946D25
#946D25
oklch(56.1% 0.1 79.1)
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 #5175AF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.026
- Windows Blue #3778BF ΔE 0.032
- Dull Blue #49759C ΔE 0.032
- French Blue #436BAD ΔE 0.034
- Steel Blue #4682B4 ΔE 0.036
- Muted Blue #3B719F ΔE 0.037
- Stormy Blue #507B9C ΔE 0.039
- Cerulean #457B9D ΔE 0.039
Use #5175AF 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.