#3975A9
Closest named color: Flat Blue (#3C73A8). oklch(54.6% 0.103 247.2), rgb(57, 117, 169).
Aa
White text reads best on this color (4.89:1).
About this color
#3975A9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.103 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.006 away. White text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.29:1 |
| White text | 4.89:1 |
Values
| HEX | #3975A9 |
| RGB | rgb(57, 117, 169) |
| HSL | hsl(208, 50%, 44%) |
| OKLCH | oklch(54.6% 0.103 247.2) |
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 #3975A9 | 4.89:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #3975A9 | 4.29:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #3975A9 text on white | 4.89:1 | AA | Lc 73.7 | Content text, not long reading |
| #3975A9 text on black | 4.29:1 | AA large text | Lc -28.0 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CCDBEA
oklch(88.5% 0.026 248.1)
-
Step 300
300
#A9C4DD
oklch(80.8% 0.046 246.3)
-
Step 400
400
#7BA5CD
oklch(70.6% 0.075 247.7)
-
Step 500
500
#588EC0
oklch(63% 0.095 247.8)
-
Step 600
600 (this color)
#3975A9
oklch(54.6% 0.103 247.2)
-
Step 700
700
#2E6594
oklch(49.2% 0.095 247.1)
-
Step 800
800
#275278
oklch(42.6% 0.08 247.6)
-
Step 900
900
#254461
oklch(37.7% 0.062 248.3)
-
Step 950
950
#162839
oklch(27% 0.04 248.2)
#3975A9 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) | #5E77AB | 0.041 |
| Deuteranopia (no green cones) | #4F6CA8 | 0.031 |
| Tritanopia (no blue cones) | #008187 | 0.078 |
| Achromatopsia (no color) | #717171 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3975A9
#3975A9
oklch(54.6% 0.103 247.2)
- #986324
#986324
oklch(54.6% 0.103 66.7)
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 #3975A9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.006
- Muted Blue #3B719F ΔE 0.017
- Nice Blue #107AB0 ΔE 0.024
- Dull Blue #49759C ΔE 0.024
- French Blue #436BAD ΔE 0.031
- Cerulean #457B9D ΔE 0.032
- Windows Blue #3778BF ΔE 0.034
- Ocean Blue #03719C ΔE 0.038
Use #3975A9 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.