#3173D5
Closest named color: Royal Blue (#4169E1). oklch(56.6% 0.165 258.5), rgb(49, 115, 213).
Aa
White text reads best on this color (4.62:1).
About this color
#3173D5 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.165 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.034 away. White text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.54:1 |
| White text | 4.62:1 |
Values
| HEX | #3173D5 |
| RGB | rgb(49, 115, 213) |
| HSL | hsl(216, 66%, 51%) |
| OKLCH | oklch(56.6% 0.165 258.5) |
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 #3173D5 | 4.62:1 | AA | Lc -77.1 | Fine for body text |
| Black text on #3173D5 | 4.54:1 | AA | Lc 32.4 | Non-text elements, placeholder text |
| #3173D5 text on white | 4.62:1 | AA | Lc 71.7 | Content text, not long reading |
| #3173D5 text on black | 4.54:1 | AA | Lc -30.0 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DAF5
oklch(88.4% 0.042 259.6)
-
Step 300
300
#A4C2F1
oklch(80.8% 0.074 259.3)
-
Step 400
400
#72A2EA
oklch(70.8% 0.118 258.3)
-
Step 500
500
#4C88E4
oklch(63.1% 0.153 258.7)
-
Step 600
600 (this color)
#3173D5
oklch(56.6% 0.165 258.5)
-
Step 700
700
#215DB6
oklch(49.1% 0.154 258.7)
-
Step 800
800
#1D4D93
oklch(42.8% 0.127 258.3)
-
Step 900
900
#1D4075
oklch(37.6% 0.1 258.6)
-
Step 950
950
#122645
oklch(27% 0.064 258.9)
#3173D5 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) | #3E7DD9 | 0.031 |
| Deuteranopia (no green cones) | #146ED3 | 0.023 |
| Tritanopia (no blue cones) | #008A9A | 0.126 |
| Achromatopsia (no color) | #757575 | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3173D5
#3173D5
oklch(56.6% 0.165 258.5)
- #9B6C00
#9B6C00
oklch(56.5% 0.118 78.6)
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 #3173D5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.034
- Windows Blue #3778BF ΔE 0.039
- Cerulean Blue #056EEE ΔE 0.045
- Mid Blue #276AB3 ΔE 0.057
- Water Blue #0E87CC ΔE 0.058
- Neon Blue #4361EE ΔE 0.061
- Clear Blue #247AFD ΔE 0.061
- French Blue #436BAD ΔE 0.063
Use #3173D5 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.