#3173E1
Closest named color: Royal Blue (#4169E1). oklch(57.4% 0.181 260.1), rgb(49, 115, 225).
Aa
Black text reads best on this color (4.67:1).
About this color
#3173E1 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.181 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.026 away. Black text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.181) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.67:1 |
| White text | 4.49:1 |
Values
| HEX | #3173E1 |
| RGB | rgb(49, 115, 225) |
| HSL | hsl(218, 75%, 54%) |
| OKLCH | oklch(57.4% 0.181 260.1) |
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 #3173E1 | 4.49:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #3173E1 | 4.67:1 | AA | Lc 33.4 | Non-text elements, placeholder text |
| #3173E1 text on white | 4.49:1 | AA large text | Lc 70.7 | Content text, not long reading |
| #3173E1 text on black | 4.67:1 | AA | Lc -30.9 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A2C2F6
oklch(80.9% 0.082 260)
-
Step 400
400
#70A0F1
oklch(70.6% 0.13 260.4)
-
Step 500
500
#4986EC
oklch(63% 0.166 260.1)
-
Step 600
600 (this color)
#3173E1
oklch(57.4% 0.181 260.1)
-
Step 700
700
#1E5BBE
oklch(49.2% 0.168 260)
-
Step 800
800
#1B4B9A
oklch(42.8% 0.139 260)
-
Step 900
900
#1C3F7A
oklch(37.7% 0.109 260.2)
-
Step 950
950
#112547
oklch(26.8% 0.069 260.3)
#3173E1 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) | #317FE5 | 0.031 |
| Deuteranopia (no green cones) | #006FDF | 0.025 |
| Tritanopia (no blue cones) | #008D9F | 0.139 |
| Achromatopsia (no color) | #777777 | 0.181 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3173E1
#3173E1
oklch(57.4% 0.181 260.1)
- #9D6F00
#9D6F00
oklch(57.4% 0.119 79.8)
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 #3173E1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.026
- Cerulean Blue #056EEE ΔE 0.031
- Clear Blue #247AFD ΔE 0.044
- Neon Blue #4361EE ΔE 0.049
- Windows Blue #3778BF ΔE 0.056
- Bright Blue #0165FC ΔE 0.059
- Azul #1D5DEC ΔE 0.061
- Water Blue #0E87CC ΔE 0.067
Use #3173E1 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.