#3673AE
Closest named color: Flat Blue (#3C73A8). oklch(54.3% 0.112 250), rgb(54, 115, 174).
Aa
White text reads best on this color (4.97:1).
About this color
#3673AE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.112 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.010 away. White text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.22:1 |
| White text | 4.97:1 |
Values
| HEX | #3673AE |
| RGB | rgb(54, 115, 174) |
| HSL | hsl(210, 53%, 45%) |
| OKLCH | oklch(54.3% 0.112 250) |
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 #3673AE | 4.97:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #3673AE | 4.22:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #3673AE text on white | 4.97:1 | AA | Lc 74.2 | Content text, not long reading |
| #3673AE text on black | 4.22:1 | AA large text | Lc -27.5 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CCDBEB
oklch(88.5% 0.027 249.9)
-
Step 300
300
#A9C4E1
oklch(81% 0.051 250.3)
-
Step 400
400
#7AA5D1
oklch(70.7% 0.08 249.6)
-
Step 500
500
#568EC6
oklch(63.2% 0.104 249.8)
-
Step 600
600 (this color)
#3673AE
oklch(54.3% 0.112 250)
-
Step 700
700
#2C6499
oklch(49.2% 0.104 249.7)
-
Step 800
800
#26527C
oklch(42.8% 0.085 249.5)
-
Step 900
900
#244464
oklch(37.8% 0.067 250)
-
Step 950
950
#15283A
oklch(27% 0.042 248.4)
#3673AE 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) | #5976B0 | 0.039 |
| Deuteranopia (no green cones) | #486BAD | 0.026 |
| Tritanopia (no blue cones) | #008188 | 0.086 |
| Achromatopsia (no color) | #707070 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3673AE
#3673AE
oklch(54.3% 0.112 250)
- #986210
#986210
oklch(54.2% 0.112 70.2)
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 #3673AE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.010
- Muted Blue #3B719F ΔE 0.023
- French Blue #436BAD ΔE 0.024
- Nice Blue #107AB0 ΔE 0.025
- Windows Blue #3778BF ΔE 0.028
- Mid Blue #276AB3 ΔE 0.032
- Dull Blue #49759C ΔE 0.035
- Ocean Blue #03719C ΔE 0.040
Use #3673AE 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.