#317DD4
Closest named color: Windows Blue (#3778BF). oklch(58.7% 0.153 254.3), rgb(49, 125, 212).
Aa
Black text reads best on this color (5.01:1).
About this color
#317DD4 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.153 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.033 away. Black text reads best on it, at 5.01:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.01:1 |
| White text | 4.18:1 |
Values
| HEX | #317DD4 |
| RGB | rgb(49, 125, 212) |
| HSL | hsl(212, 65%, 51%) |
| OKLCH | oklch(58.7% 0.153 254.3) |
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 #317DD4 | 4.18:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #317DD4 | 5.01:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #317DD4 text on white | 4.18:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #317DD4 text on black | 5.01:1 | AA | Lc -33.2 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF3
oklch(88.5% 0.039 254.3)
-
Step 300
300
#A3C4ED
oklch(81% 0.068 254.1)
-
Step 400
400
#70A4E4
oklch(70.8% 0.109 254.2)
-
Step 500
500
#478BDC
oklch(63% 0.141 254.3)
-
Step 600
600 (this color)
#317DD4
oklch(58.7% 0.153 254.3)
-
Step 700
700
#1860AE
oklch(49% 0.142 254.3)
-
Step 800
800
#174F8D
oklch(42.7% 0.117 254.2)
-
Step 900
900
#1A4271
oklch(37.7% 0.092 254.4)
-
Step 950
950
#112742
oklch(27% 0.058 254.7)
#317DD4 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) | #5384D7 | 0.038 |
| Deuteranopia (no green cones) | #3775D2 | 0.021 |
| Tritanopia (no blue cones) | #00929E | 0.117 |
| Achromatopsia (no color) | #7C7C7C | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #317DD4
#317DD4
oklch(58.7% 0.153 254.3)
- #A76F00
#A76F00
oklch(58.6% 0.124 74.2)
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 #317DD4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.033
- Water Blue #0E87CC ΔE 0.034
- Dark Sky Blue #448EE4 ΔE 0.054
- Cool Blue #4984B8 ΔE 0.055
- Steel Blue #4682B4 ΔE 0.056
- Royal Blue #4169E1 ΔE 0.057
- Nice Blue #107AB0 ΔE 0.060
- Cerulean Blue #056EEE ΔE 0.063
Use #317DD4 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.