#3373D8
Closest named color: Royal Blue (#4169E1). oklch(56.8% 0.168 259.3), rgb(51, 115, 216).
Aa
Black text reads best on this color (4.58:1).
About this color
#3373D8 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.168 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.031 away. Black text reads best on it, at 4.58:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.58:1 |
| White text | 4.58:1 |
Values
| HEX | #3373D8 |
| RGB | rgb(51, 115, 216) |
| HSL | hsl(217, 68%, 52%) |
| OKLCH | oklch(56.8% 0.168 259.3) |
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 #3373D8 | 4.58:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #3373D8 | 4.58:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #3373D8 text on white | 4.58:1 | AA | Lc 71.4 | Content text, not long reading |
| #3373D8 text on black | 4.58:1 | AA | Lc -30.3 | 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
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A4C2F2
oklch(80.9% 0.076 259.7)
-
Step 400
400
#72A1EC
oklch(70.7% 0.122 259.4)
-
Step 500
500
#4D88E6
oklch(63.2% 0.155 259.3)
-
Step 600
600 (this color)
#3373D8
oklch(56.8% 0.168 259.3)
-
Step 700
700
#225CB8
oklch(49.1% 0.158 259.6)
-
Step 800
800
#1E4C94
oklch(42.7% 0.129 259.3)
-
Step 900
900
#1E4076
oklch(37.7% 0.101 259.3)
-
Step 950
950
#122645
oklch(27% 0.064 258.9)
#3373D8 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) | #3C7DDC | 0.029 |
| Deuteranopia (no green cones) | #0A6ED6 | 0.026 |
| Tritanopia (no blue cones) | #008B9B | 0.131 |
| Achromatopsia (no color) | #757575 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3373D8
#3373D8
oklch(56.8% 0.168 259.3)
- #9B6D00
#9B6D00
oklch(56.7% 0.118 79.4)
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 #3373D8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.031
- Cerulean Blue #056EEE ΔE 0.042
- Windows Blue #3778BF ΔE 0.043
- Clear Blue #247AFD ΔE 0.057
- Neon Blue #4361EE ΔE 0.057
- Water Blue #0E87CC ΔE 0.060
- Mid Blue #276AB3 ΔE 0.062
- French Blue #436BAD ΔE 0.067
Use #3373D8 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.