#317FC4
Closest named color: Windows Blue (#3778BF). oklch(58.2% 0.13 248.8), rgb(49, 127, 196).
Aa
Black text reads best on this color (4.96:1).
About this color
#317FC4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.130 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.019 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.96:1 |
| White text | 4.23:1 |
Values
| HEX | #317FC4 |
| RGB | rgb(49, 127, 196) |
| HSL | hsl(208, 60%, 48%) |
| OKLCH | oklch(58.2% 0.13 248.8) |
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 #317FC4 | 4.23:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #317FC4 | 4.96:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #317FC4 text on white | 4.23:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #317FC4 text on black | 4.96:1 | AA | Lc -32.8 | 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
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DBEE
oklch(88.4% 0.033 249.6)
-
Step 300
300
#A4C4E5
oklch(80.8% 0.058 249.3)
-
Step 400
400
#71A5D9
oklch(70.6% 0.095 249.3)
-
Step 500
500
#498ECE
oklch(63% 0.12 248.7)
-
Step 600
600 (this color)
#317FC4
oklch(58.2% 0.13 248.8)
-
Step 700
700
#1964A2
oklch(49.2% 0.122 248.8)
-
Step 800
800
#185283
oklch(42.8% 0.1 248.5)
-
Step 900
900
#1B4469
oklch(37.7% 0.078 248.6)
-
Step 950
950
#11283D
oklch(26.9% 0.049 248.1)
#317FC4 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) | #5F83C7 | 0.046 |
| Deuteranopia (no green cones) | #4A75C3 | 0.031 |
| Tritanopia (no blue cones) | #008F98 | 0.095 |
| Achromatopsia (no color) | #7B7B7B | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #317FC4
#317FC4
oklch(58.2% 0.13 248.8)
- #AB6A00
#AB6A00
oklch(58.2% 0.127 68.3)
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 #317FC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.019
- Water Blue #0E87CC ΔE 0.024
- Steel Blue #4682B4 ΔE 0.032
- Cool Blue #4984B8 ΔE 0.033
- Nice Blue #107AB0 ΔE 0.038
- Blue NCS #118AB2 ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.049
- Off Blue #5684AE ΔE 0.051
Use #317FC4 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.