#317DC3
Closest named color: Windows Blue (#3778BF). oklch(57.7% 0.131 249.7), rgb(49, 125, 195).
Aa
Black text reads best on this color (4.85:1).
About this color
#317DC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.131 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.014 away. Black text reads best on it, at 4.85:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.85:1 |
| White text | 4.32:1 |
Values
| HEX | #317DC3 |
| RGB | rgb(49, 125, 195) |
| HSL | hsl(209, 60%, 48%) |
| OKLCH | oklch(57.7% 0.131 249.7) |
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 #317DC3 | 4.32:1 | AA large text | Lc -75.1 | Fine for body text |
| Black text on #317DC3 | 4.85:1 | AA | Lc 34.5 | Non-text elements, placeholder text |
| #317DC3 text on white | 4.32:1 | AA large text | Lc 69.6 | Content text, not long reading |
| #317DC3 text on black | 4.85:1 | AA | Lc -32.0 | Non-text elements, placeholder text |
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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#C9DBEE
oklch(88.4% 0.033 249.6)
-
Step 300
300
#A4C4E6
oklch(80.8% 0.059 250.1)
-
Step 400
400
#72A5D9
oklch(70.6% 0.094 249.7)
-
Step 500
500
#4B8ECF
oklch(63.2% 0.12 249.6)
-
Step 600
600 (this color)
#317DC3
oklch(57.7% 0.131 249.7)
-
Step 700
700
#1C63A2
oklch(49% 0.122 249.9)
-
Step 800
800
#1A5183
oklch(42.6% 0.101 249.8)
-
Step 900
900
#1C4469
oklch(37.7% 0.078 249.1)
-
Step 950
950
#12283E
oklch(27.1% 0.05 250.2)
#317DC3 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) | #5D81C6 | 0.044 |
| Deuteranopia (no green cones) | #4773C2 | 0.030 |
| Tritanopia (no blue cones) | #008E97 | 0.097 |
| Achromatopsia (no color) | #797979 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #317DC3
#317DC3
oklch(57.7% 0.131 249.7)
- #A86A00
#A86A00
oklch(57.8% 0.125 69.8)
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 #317DC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.014
- Water Blue #0E87CC ΔE 0.029
- Steel Blue #4682B4 ΔE 0.034
- Nice Blue #107AB0 ΔE 0.036
- Cool Blue #4984B8 ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.045
- Blue NCS #118AB2 ΔE 0.052
- Off Blue #5684AE ΔE 0.054
Use #317DC3 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.