#397BC4
Closest named color: Windows Blue (#3778BF). oklch(57.5% 0.131 253), rgb(57, 123, 196).
Aa
Black text reads best on this color (4.80:1).
About this color
#397BC4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.131 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.011 away. Black text reads best on it, at 4.80:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.80:1 |
| White text | 4.37:1 |
Values
| HEX | #397BC4 |
| RGB | rgb(57, 123, 196) |
| HSL | hsl(212, 55%, 50%) |
| OKLCH | oklch(57.5% 0.131 253) |
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 #397BC4 | 4.37:1 | AA large text | Lc -75.5 | Fine for body text |
| Black text on #397BC4 | 4.80:1 | AA | Lc 34.1 | Non-text elements, placeholder text |
| #397BC4 text on white | 4.37:1 | AA large text | Lc 70.0 | Content text, not long reading |
| #397BC4 text on black | 4.80:1 | AA | Lc -31.7 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEF
oklch(88.5% 0.033 252.5)
-
Step 300
300
#A6C4E7
oklch(81% 0.059 252.5)
-
Step 400
400
#76A4DA
oklch(70.7% 0.094 253)
-
Step 500
500
#518CD1
oklch(63.1% 0.122 253.5)
-
Step 600
600 (this color)
#397BC4
oklch(57.5% 0.131 253)
-
Step 700
700
#2562A4
oklch(49.1% 0.123 253.1)
-
Step 800
800
#205085
oklch(42.7% 0.102 253.2)
-
Step 900
900
#20436A
oklch(37.7% 0.079 252.8)
-
Step 950
950
#14273E
oklch(26.9% 0.05 254.1)
#397BC4 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) | #5A80C7 | 0.037 |
| Deuteranopia (no green cones) | #4573C3 | 0.022 |
| Tritanopia (no blue cones) | #008C96 | 0.101 |
| Achromatopsia (no color) | #797979 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397BC4
#397BC4
oklch(57.5% 0.131 253)
- #A46B00
#A46B00
oklch(57.5% 0.123 72.7)
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 #397BC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.011
- Water Blue #0E87CC ΔE 0.035
- Steel Blue #4682B4 ΔE 0.037
- Cool Blue #4984B8 ΔE 0.039
- Nice Blue #107AB0 ΔE 0.040
- Flat Blue #3C73A8 ΔE 0.045
- French Blue #436BAD ΔE 0.051
- Off Blue #5684AE ΔE 0.055
Use #397BC4 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.