#397AC3
Closest named color: Windows Blue (#3778BF). oklch(57.3% 0.131 253.3), rgb(57, 122, 195).
Aa
Black text reads best on this color (4.74:1).
About this color
#397AC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, 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 0.008 away. Black text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.74:1 |
| White text | 4.42:1 |
Values
| HEX | #397AC3 |
| RGB | rgb(57, 122, 195) |
| HSL | hsl(212, 55%, 49%) |
| OKLCH | oklch(57.3% 0.131 253.3) |
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 #397AC3 | 4.42:1 | AA large text | Lc -75.9 | Fine for body text |
| Black text on #397AC3 | 4.74:1 | AA | Lc 33.7 | Non-text elements, placeholder text |
| #397AC3 text on white | 4.42:1 | AA large text | Lc 70.4 | Content text, not long reading |
| #397AC3 text on black | 4.74:1 | AA | Lc -31.3 | 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
#A6C3E7
oklch(80.8% 0.06 254)
-
Step 400
400
#76A4DA
oklch(70.7% 0.094 253)
-
Step 500
500
#518CD0
oklch(63% 0.12 253.2)
-
Step 600
600 (this color)
#397AC3
oklch(57.3% 0.131 253.3)
-
Step 700
700
#2662A4
oklch(49.2% 0.122 253.4)
-
Step 800
800
#215084
oklch(42.6% 0.101 253.2)
-
Step 900
900
#21436A
oklch(37.7% 0.078 253.3)
-
Step 950
950
#14273E
oklch(26.9% 0.05 254.1)
#397AC3 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) | #597FC6 | 0.036 |
| Deuteranopia (no green cones) | #4472C2 | 0.022 |
| Tritanopia (no blue cones) | #008B95 | 0.101 |
| Achromatopsia (no color) | #787878 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397AC3
#397AC3
oklch(57.3% 0.131 253.3)
- #A36B00
#A36B00
oklch(57.3% 0.122 73.2)
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 #397AC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.008
- Water Blue #0E87CC ΔE 0.037
- Steel Blue #4682B4 ΔE 0.038
- Nice Blue #107AB0 ΔE 0.039
- Cool Blue #4984B8 ΔE 0.040
- Flat Blue #3C73A8 ΔE 0.043
- French Blue #436BAD ΔE 0.048
- Mid Blue #276AB3 ΔE 0.052
Use #397AC3 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.