#3373C8
Closest named color: Windows Blue (#3778BF). oklch(55.8% 0.147 256.6), rgb(51, 115, 200).
Aa
White text reads best on this color (4.74:1).
About this color
#3373C8 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.147 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.022 away. White text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #3373C8 |
| RGB | rgb(51, 115, 200) |
| HSL | hsl(214, 59%, 49%) |
| OKLCH | oklch(55.8% 0.147 256.6) |
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 #3373C8 | 4.74:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #3373C8 | 4.42:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #3373C8 text on white | 4.74:1 | AA | Lc 72.6 | Content text, not long reading |
| #3373C8 text on black | 4.42:1 | AA large text | Lc -29.1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADBF2
oklch(88.6% 0.037 256)
-
Step 300
300
#A5C3EC
oklch(80.9% 0.067 256.3)
-
Step 400
400
#75A3E2
oklch(70.8% 0.105 256.4)
-
Step 500
500
#508ADA
oklch(63.1% 0.136 256.8)
-
Step 600
600 (this color)
#3373C8
oklch(55.8% 0.147 256.6)
-
Step 700
700
#255FAC
oklch(49% 0.137 256.8)
-
Step 800
800
#204E8C
oklch(42.6% 0.114 256.9)
-
Step 900
900
#204270
oklch(37.8% 0.089 256.6)
-
Step 950
950
#132741
oklch(27% 0.055 255.7)
#3373C8 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) | #497ACB | 0.030 |
| Deuteranopia (no green cones) | #2F6DC6 | 0.017 |
| Tritanopia (no blue cones) | #008794 | 0.113 |
| Achromatopsia (no color) | #737373 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3373C8
#3373C8
oklch(55.8% 0.147 256.6)
- #9A6900
#9A6900
oklch(55.8% 0.117 76.7)
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 #3373C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.022
- Mid Blue #276AB3 ΔE 0.041
- French Blue #436BAD ΔE 0.044
- Nice Blue #107AB0 ΔE 0.049
- Royal Blue #4169E1 ΔE 0.050
- Flat Blue #3C73A8 ΔE 0.050
- Water Blue #0E87CC ΔE 0.054
- Steel Blue #4682B4 ΔE 0.061
Use #3373C8 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.