#397E9E
Closest named color: Cerulean (#457B9D). oklch(56.2% 0.085 231), rgb(57, 126, 158).
Aa
Black text reads best on this color (4.65:1).
About this color
#397E9E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.085 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.012 away. Black text reads best on it, at 4.65:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.65:1 |
| White text | 4.51:1 |
Values
| HEX | #397E9E |
| RGB | rgb(57, 126, 158) |
| HSL | hsl(199, 47%, 42%) |
| OKLCH | oklch(56.2% 0.085 231) |
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 #397E9E | 4.51:1 | AA | Lc -76.6 | Fine for body text |
| Black text on #397E9E | 4.65:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #397E9E text on white | 4.51:1 | AA | Lc 71.1 | Content text, not long reading |
| #397E9E text on black | 4.65:1 | AA | Lc -30.5 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CCDCE5
oklch(88.5% 0.021 232.2)
-
Step 300
300
#A9C6D5
oklch(81% 0.038 230.3)
-
Step 400
400
#79A8C0
oklch(70.7% 0.061 230.9)
-
Step 500
500
#5592B0
oklch(63% 0.078 231.1)
-
Step 600
600 (this color)
#397E9E
oklch(56.2% 0.085 231)
-
Step 700
700
#296885
oklch(49% 0.079 231.5)
-
Step 800
800
#23556C
oklch(42.6% 0.065 231)
-
Step 900
900
#224658
oklch(37.6% 0.052 232.2)
-
Step 950
950
#152933
oklch(26.9% 0.032 231.4)
#397E9E 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) | #6E7CA0 | 0.058 |
| Deuteranopia (no green cones) | #60729E | 0.050 |
| Tritanopia (no blue cones) | #008789 | 0.055 |
| Achromatopsia (no color) | #767676 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397E9E
#397E9E
oklch(56.2% 0.085 231)
- #9D6646
#9D6646
oklch(56.2% 0.085 50.5)
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 #397E9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.012
- Stormy Blue #507B9C ΔE 0.022
- Dull Blue #49759C ΔE 0.028
- Teal Blue #01889F ΔE 0.034
- Ocean #017B92 ΔE 0.035
- Metallic Blue #4F738E ΔE 0.037
- Steel Blue #4682B4 ΔE 0.038
- Muted Blue #3B719F ΔE 0.039
Use #397E9E 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.