#5170C8
Closest named color: Windows Blue (#3778BF). oklch(56.5% 0.141 267.2), rgb(81, 112, 200).
Aa
White text reads best on this color (4.66:1).
About this color
#5170C8 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.141 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.036 away. White text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.50:1 |
| White text | 4.66:1 |
Values
| HEX | #5170C8 |
| RGB | rgb(81, 112, 200) |
| HSL | hsl(224, 52%, 55%) |
| OKLCH | oklch(56.5% 0.141 267.2) |
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 #5170C8 | 4.66:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #5170C8 | 4.50:1 | AA | Lc 31.9 | Non-text elements, placeholder text |
| #5170C8 text on white | 4.66:1 | AA | Lc 72.2 | Content text, not long reading |
| #5170C8 text on black | 4.50:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CFD9F1
oklch(88.5% 0.035 267.6)
-
Step 300
300
#AEC0EB
oklch(80.9% 0.064 267.2)
-
Step 400
400
#849FE0
oklch(70.8% 0.1 266.6)
-
Step 500
500
#6685D8
oklch(63.1% 0.13 267.2)
-
Step 600
600 (this color)
#5170C8
oklch(56.5% 0.141 267.2)
-
Step 700
700
#405BAA
oklch(49.1% 0.13 267.3)
-
Step 800
800
#344B8A
oklch(42.8% 0.108 266.8)
-
Step 900
900
#2E3F6E
oklch(37.8% 0.084 267.4)
-
Step 950
950
#1B2541
oklch(27% 0.054 267.8)
#5170C8 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) | #487ACB | 0.027 |
| Deuteranopia (no green cones) | #376FC6 | 0.027 |
| Tritanopia (no blue cones) | #008492 | 0.124 |
| Achromatopsia (no color) | #747474 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5170C8
#5170C8
oklch(56.5% 0.141 267.2)
- #937000
#937000
oklch(56.4% 0.115 86.8)
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 #5170C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.036
- French Blue #436BAD ΔE 0.047
- Royal Blue #4169E1 ΔE 0.048
- Dark Periwinkle #665FD1 ΔE 0.051
- Mid Blue #276AB3 ΔE 0.056
- Flat Blue #3C73A8 ΔE 0.058
- Iris #6258C4 ΔE 0.061
- Slate Blue #6A5ACD ΔE 0.062
Use #5170C8 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.