#397AA6
Closest named color: Cerulean (#457B9D). oklch(55.7% 0.095 241), rgb(57, 122, 166).
Aa
White text reads best on this color (4.65:1).
About this color
#397AA6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.095 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.018 away. White text reads best on it, at 4.65:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.50:1 |
| White text | 4.65:1 |
Values
| HEX | #397AA6 |
| RGB | rgb(57, 122, 166) |
| HSL | hsl(204, 49%, 44%) |
| OKLCH | oklch(55.7% 0.095 241) |
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 #397AA6 | 4.65:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #397AA6 | 4.50:1 | AA | Lc 32.0 | Non-text elements, placeholder text |
| #397AA6 text on white | 4.65:1 | AA | Lc 72.1 | Content text, not long reading |
| #397AA6 text on black | 4.50:1 | AA | Lc -29.6 | 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
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CCDCE8
oklch(88.6% 0.024 240.1)
-
Step 300
300
#A9C5DA
oklch(80.9% 0.042 240.5)
-
Step 400
400
#7AA7C8
oklch(70.8% 0.069 240.7)
-
Step 500
500
#5690BA
oklch(63.1% 0.088 241.5)
-
Step 600
600 (this color)
#397AA6
oklch(55.7% 0.095 241)
-
Step 700
700
#2B668E
oklch(49% 0.089 241.5)
-
Step 800
800
#255473
oklch(42.8% 0.073 240.4)
-
Step 900
900
#23455D
oklch(37.6% 0.057 241.3)
-
Step 950
950
#152937
oklch(27.1% 0.037 240.5)
#397AA6 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) | #667AA8 | 0.049 |
| Deuteranopia (no green cones) | #576FA5 | 0.041 |
| Tritanopia (no blue cones) | #008589 | 0.069 |
| Achromatopsia (no color) | #747474 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397AA6
#397AA6
oklch(55.7% 0.095 241)
- #9C6534
#9C6534
oklch(55.6% 0.096 60.4)
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 #397AA6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.018
- Dull Blue #49759C ΔE 0.021
- Flat Blue #3C73A8 ΔE 0.021
- Nice Blue #107AB0 ΔE 0.025
- Muted Blue #3B719F ΔE 0.026
- Stormy Blue #507B9C ΔE 0.027
- Steel Blue #4682B4 ΔE 0.033
- Metallic Blue #4F738E ΔE 0.040
Use #397AA6 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.