#3166E5
Closest named color: Royal Blue (#4169E1). oklch(55.1% 0.201 263.9), rgb(49, 102, 229).
Aa
White text reads best on this color (5.04:1).
About this color
#3166E5 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.201 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.018 away. White text reads best on it, at 5.04:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.201) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.16:1 |
| White text | 5.04:1 |
Values
| HEX | #3166E5 |
| RGB | rgb(49, 102, 229) |
| HSL | hsl(222, 78%, 55%) |
| OKLCH | oklch(55.1% 0.201 263.9) |
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 #3166E5 | 5.04:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #3166E5 | 4.16:1 | AA large text | Lc 29.8 | Dividers and decoration only |
| #3166E5 text on white | 5.04:1 | AA | Lc 74.3 | Content text, not long reading |
| #3166E5 text on black | 4.16:1 | AA large text | Lc -27.4 | Dividers and decoration only |
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
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C8DAFB
oklch(88.5% 0.05 262.6)
-
Step 300
300
#A3C1FC
oklch(81% 0.09 263.6)
-
Step 400
400
#719EFB
oklch(70.8% 0.145 263.6)
-
Step 500
500
#4D82F8
oklch(63.1% 0.185 263.7)
-
Step 600
600 (this color)
#3166E5
oklch(55.1% 0.201 263.9)
-
Step 700
700
#2655C9
oklch(49.1% 0.188 264)
-
Step 800
800
#2047A2
oklch(42.8% 0.154 263.6)
-
Step 900
900
#1F3C81
oklch(37.6% 0.122 264.2)
-
Step 950
950
#12244B
oklch(26.9% 0.076 263.5)
#3166E5 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) | #0077E9 | 0.042 |
| Deuteranopia (no green cones) | #0067E3 | 0.021 |
| Tritanopia (no blue cones) | #00869C | 0.157 |
| Achromatopsia (no color) | #6F6F6F | 0.202 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3166E5
#3166E5
oklch(55.1% 0.201 263.9)
- #916B00
#916B00
oklch(55.1% 0.113 83.9)
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 #3166E5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.018
- Neon Blue #4361EE ΔE 0.023
- Cerulean Blue #056EEE ΔE 0.026
- Azul #1D5DEC ΔE 0.029
- Bright Blue #0165FC ΔE 0.040
- Warm Blue #4B57DB ΔE 0.041
- Clear Blue #247AFD ΔE 0.058
- Electric Blue #0652FF ΔE 0.065
Use #3166E5 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.