#3A73C8
Closest named color: Windows Blue (#3778BF). oklch(56% 0.145 258.3), rgb(58, 115, 200).
Aa
White text reads best on this color (4.70:1).
About this color
#3A73C8 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.145 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.021 away. White text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.46:1 |
| White text | 4.70:1 |
Values
| HEX | #3A73C8 |
| RGB | rgb(58, 115, 200) |
| HSL | hsl(216, 56%, 51%) |
| OKLCH | oklch(56% 0.145 258.3) |
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 #3A73C8 | 4.70:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #3A73C8 | 4.46:1 | AA large text | Lc 31.8 | Non-text elements, placeholder text |
| #3A73C8 text on white | 4.70:1 | AA | Lc 72.3 | Content text, not long reading |
| #3A73C8 text on black | 4.46:1 | AA large text | Lc -29.4 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A7C2EB
oklch(80.8% 0.065 258.6)
-
Step 400
400
#78A2E1
oklch(70.7% 0.104 258.3)
-
Step 500
500
#5489D9
oklch(63% 0.134 258.4)
-
Step 600
600 (this color)
#3A73C8
oklch(56% 0.145 258.3)
-
Step 700
700
#2B5FAC
oklch(49.2% 0.135 258.3)
-
Step 800
800
#254E8B
oklch(42.8% 0.111 258.3)
-
Step 900
900
#23416F
oklch(37.7% 0.087 258.7)
-
Step 950
950
#152641
oklch(26.9% 0.056 259.3)
#3A73C8 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) | #4A7BCB | 0.029 |
| Deuteranopia (no green cones) | #326EC6 | 0.016 |
| Tritanopia (no blue cones) | #008794 | 0.114 |
| Achromatopsia (no color) | #747474 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A73C8
#3A73C8
oklch(56% 0.145 258.3)
- #996B00
#996B00
oklch(56.1% 0.117 78.9)
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 #3A73C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.021
- Mid Blue #276AB3 ΔE 0.044
- French Blue #436BAD ΔE 0.044
- Royal Blue #4169E1 ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.050
- Nice Blue #107AB0 ΔE 0.052
- Water Blue #0E87CC ΔE 0.055
- Steel Blue #4682B4 ΔE 0.060
Use #3A73C8 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.