#397AA0
Closest named color: Cerulean (#457B9D). oklch(55.4% 0.089 237.1), rgb(57, 122, 160).
Aa
White text reads best on this color (4.70:1).
About this color
#397AA0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.089 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.012 away. White text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.46:1 |
| White text | 4.70:1 |
Values
| HEX | #397AA0 |
| RGB | rgb(57, 122, 160) |
| HSL | hsl(202, 47%, 43%) |
| OKLCH | oklch(55.4% 0.089 237.1) |
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 #397AA0 | 4.70:1 | AA | Lc -77.9 | Fine for body text |
| Black text on #397AA0 | 4.46:1 | AA large text | Lc 31.6 | Non-text elements, placeholder text |
| #397AA0 text on white | 4.70:1 | AA | Lc 72.4 | Content text, not long reading |
| #397AA0 text on black | 4.46:1 | AA large text | Lc -29.2 | 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
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDCE6
oklch(88.5% 0.022 235)
-
Step 300
300
#A9C5D8
oklch(80.9% 0.041 237.7)
-
Step 400
400
#7AA7C4
oklch(70.7% 0.064 237.1)
-
Step 500
500
#5791B5
oklch(63.1% 0.082 237.2)
-
Step 600
600 (this color)
#397AA0
oklch(55.4% 0.089 237.1)
-
Step 700
700
#2B678A
oklch(49% 0.083 237.5)
-
Step 800
800
#255470
oklch(42.6% 0.069 237.6)
-
Step 900
900
#24465A
oklch(37.8% 0.052 236.3)
-
Step 950
950
#162935
oklch(27.1% 0.033 237.5)
#397AA0 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) | #6879A2 | 0.052 |
| Deuteranopia (no green cones) | #5A6F9F | 0.043 |
| Tritanopia (no blue cones) | #008487 | 0.062 |
| Achromatopsia (no color) | #747474 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397AA0
#397AA0
oklch(55.4% 0.089 237.1)
- #9A653C
#9A653C
oklch(55.5% 0.089 57.3)
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 #397AA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.012
- Dull Blue #49759C ΔE 0.018
- Stormy Blue #507B9C ΔE 0.023
- Muted Blue #3B719F ΔE 0.026
- Flat Blue #3C73A8 ΔE 0.027
- Nice Blue #107AB0 ΔE 0.032
- Metallic Blue #4F738E ΔE 0.034
- Ocean #017B92 ΔE 0.037
Use #397AA0 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.