#3173EF
Closest named color: Cerulean Blue (#056EEE). oklch(58.4% 0.199 261.5), rgb(49, 115, 239).
Aa
Black text reads best on this color (4.82:1).
About this color
#3173EF is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.199 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.025 away. Black text reads best on it, at 4.82:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.199) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.82:1 |
| White text | 4.34:1 |
Values
| HEX | #3173EF |
| RGB | rgb(49, 115, 239) |
| HSL | hsl(219, 86%, 56%) |
| OKLCH | oklch(58.4% 0.199 261.5) |
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 #3173EF | 4.34:1 | AA large text | Lc -75.0 | Fine for body text |
| Black text on #3173EF | 4.82:1 | AA | Lc 34.5 | Non-text elements, placeholder text |
| #3173EF text on white | 4.34:1 | AA large text | Lc 69.6 | Content text, not long reading |
| #3173EF text on black | 4.82:1 | AA | Lc -32.1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFB
oklch(88.5% 0.05 261.5)
-
Step 300
300
#A1C1FB
oklch(80.8% 0.09 262.1)
-
Step 400
400
#6D9FF9
oklch(70.7% 0.143 261.4)
-
Step 500
500
#4684F6
oklch(63.1% 0.183 261.3)
-
Step 600
600 (this color)
#3173EF
oklch(58.4% 0.199 261.5)
-
Step 700
700
#1B57C7
oklch(49% 0.185 261.5)
-
Step 800
800
#1948A1
oklch(42.7% 0.153 261.6)
-
Step 900
900
#1A3E80
oklch(37.8% 0.119 261.3)
-
Step 950
950
#10254B
oklch(27.1% 0.076 261.2)
#3173EF 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) | #1782F3 | 0.037 |
| Deuteranopia (no green cones) | #0071ED | 0.021 |
| Tritanopia (no blue cones) | #0091A6 | 0.153 |
| Achromatopsia (no color) | #797979 | 0.199 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3173EF
#3173EF
oklch(58.4% 0.199 261.5)
- #9F7300
#9F7300
oklch(58.4% 0.12 81.8)
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 #3173EF, closest first.
No curated palette has a color within ΔE 0.04 of #3173EF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.025
- Clear Blue #247AFD ΔE 0.026
- Royal Blue #4169E1 ΔE 0.031
- Neon Blue #4361EE ΔE 0.042
- Bright Blue #0165FC ΔE 0.047
- Azul #1D5DEC ΔE 0.057
- Cornflower #6A79F7 ΔE 0.063
- Warm Blue #4B57DB ΔE 0.071
Use #3173EF 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.