#317AC4
Closest named color: Windows Blue (#3778BF). oklch(57% 0.135 251.7), rgb(49, 122, 196).
Aa
Black text reads best on this color (4.71:1).
About this color
#317AC4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.135 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.009 away. Black text reads best on it, at 4.71:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.71:1 |
| White text | 4.45:1 |
Values
| HEX | #317AC4 |
| RGB | rgb(49, 122, 196) |
| HSL | hsl(210, 60%, 48%) |
| OKLCH | oklch(57% 0.135 251.7) |
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 #317AC4 | 4.45:1 | AA large text | Lc -76.1 | Fine for body text |
| Black text on #317AC4 | 4.71:1 | AA | Lc 33.5 | Non-text elements, placeholder text |
| #317AC4 text on white | 4.45:1 | AA large text | Lc 70.6 | Content text, not long reading |
| #317AC4 text on black | 4.71:1 | AA | Lc -31.1 | 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
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#C9DBEF
oklch(88.4% 0.034 251)
-
Step 300
300
#A4C4E7
oklch(80.9% 0.061 250.9)
-
Step 400
400
#73A5DC
oklch(70.8% 0.097 251.6)
-
Step 500
500
#4C8DD2
oklch(63.1% 0.124 251.6)
-
Step 600
600 (this color)
#317AC4
oklch(57% 0.135 251.7)
-
Step 700
700
#1E62A5
oklch(49% 0.126 251.9)
-
Step 800
800
#1C5186
oklch(42.8% 0.104 251.6)
-
Step 900
900
#1D436B
oklch(37.6% 0.081 251.9)
-
Step 950
950
#12283F
oklch(27.1% 0.051 251.2)
#317AC4 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) | #577FC7 | 0.040 |
| Deuteranopia (no green cones) | #4171C3 | 0.026 |
| Tritanopia (no blue cones) | #008C95 | 0.103 |
| Achromatopsia (no color) | #777777 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #317AC4
#317AC4
oklch(57% 0.135 251.7)
- #A36900
#A36900
oklch(56.9% 0.122 71.6)
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 #317AC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.009
- Water Blue #0E87CC ΔE 0.036
- Nice Blue #107AB0 ΔE 0.037
- Steel Blue #4682B4 ΔE 0.042
- Cool Blue #4984B8 ΔE 0.044
- Flat Blue #3C73A8 ΔE 0.044
- French Blue #436BAD ΔE 0.049
- Mid Blue #276AB3 ΔE 0.051
Use #317AC4 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.