#397E9A
Closest named color: Cerulean (#457B9D). oklch(56.1% 0.081 227.6), rgb(57, 126, 154).
Aa
Black text reads best on this color (4.62:1).
About this color
#397E9A is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 56%, its chroma 0.081 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.015 away. Black text reads best on it, at 4.62:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.62:1 |
| White text | 4.54:1 |
Values
| HEX | #397E9A |
| RGB | rgb(57, 126, 154) |
| HSL | hsl(197, 46%, 41%) |
| OKLCH | oklch(56.1% 0.081 227.6) |
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 #397E9A | 4.54:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #397E9A | 4.62:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #397E9A text on white | 4.54:1 | AA | Lc 71.3 | Content text, not long reading |
| #397E9A text on black | 4.62:1 | AA | Lc -30.3 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBEF
oklch(93.5% 0.01 228.9)
-
Step 200
200
#CCDCE4
oklch(88.5% 0.02 229.1)
-
Step 300
300
#A9C6D3
oklch(80.9% 0.036 226.7)
-
Step 400
400
#7AA8BD
oklch(70.6% 0.058 227.9)
-
Step 500
500
#5593AD
oklch(63.2% 0.075 227)
-
Step 600
600 (this color)
#397E9A
oklch(56.1% 0.081 227.6)
-
Step 700
700
#296982
oklch(49.1% 0.076 227.3)
-
Step 800
800
#24566A
oklch(42.8% 0.063 227.3)
-
Step 900
900
#234756
oklch(37.8% 0.049 227.3)
-
Step 950
950
#152A32
oklch(27.1% 0.031 224.6)
#397E9A 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) | #6F7C9B | 0.060 |
| Deuteranopia (no green cones) | #62729A | 0.053 |
| Tritanopia (no blue cones) | #008687 | 0.051 |
| Achromatopsia (no color) | #767676 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397E9A
#397E9A
oklch(56.1% 0.081 227.6)
- #9C664A
#9C664A
oklch(56.2% 0.081 48)
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 #397E9A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.015
- Stormy Blue #507B9C ΔE 0.023
- Dull Blue #49759C ΔE 0.030
- Ocean #017B92 ΔE 0.032
- Teal Blue #01889F ΔE 0.033
- Metallic Blue #4F738E ΔE 0.035
- Muted Blue #3B719F ΔE 0.042
- Sea Blue #047495 ΔE 0.043
Use #397E9A 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.