#3171F0
Closest named color: Cerulean Blue (#056EEE). oklch(58.1% 0.203 262.1), rgb(49, 113, 240).
Aa
Black text reads best on this color (4.75:1).
About this color
#3171F0 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.203 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.022 away. Black text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.203) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.75:1 |
| White text | 4.42:1 |
Values
| HEX | #3171F0 |
| RGB | rgb(49, 113, 240) |
| HSL | hsl(220, 86%, 57%) |
| OKLCH | oklch(58.1% 0.203 262.1) |
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 #3171F0 | 4.42:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #3171F0 | 4.75:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #3171F0 text on white | 4.42:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #3171F0 text on black | 4.75:1 | AA | Lc -31.6 | 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
#A1C1FC
oklch(80.9% 0.091 262.4)
-
Step 400
400
#6D9FFB
oklch(70.8% 0.146 261.8)
-
Step 500
500
#4783F8
oklch(63.1% 0.186 262.1)
-
Step 600
600 (this color)
#3171F0
oklch(58.1% 0.203 262.1)
-
Step 700
700
#1D56C9
oklch(49% 0.189 262.2)
-
Step 800
800
#1A47A3
oklch(42.7% 0.157 262.3)
-
Step 900
900
#1B3D81
oklch(37.7% 0.122 262.3)
-
Step 950
950
#10244B
oklch(26.8% 0.077 262.1)
#3171F0 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) | #0081F4 | 0.040 |
| Deuteranopia (no green cones) | #0070EE | 0.020 |
| Tritanopia (no blue cones) | #0090A6 | 0.156 |
| Achromatopsia (no color) | #787878 | 0.203 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3171F0
#3171F0
oklch(58.1% 0.203 262.1)
- #9D7200
#9D7200
oklch(58% 0.119 82.2)
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 #3171F0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.022
- Clear Blue #247AFD ΔE 0.028
- Royal Blue #4169E1 ΔE 0.029
- Neon Blue #4361EE ΔE 0.037
- Bright Blue #0165FC ΔE 0.042
- Azul #1D5DEC ΔE 0.052
- Cornflower #6A79F7 ΔE 0.066
- Warm Blue #4B57DB ΔE 0.067
Use #3171F0 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.