#397F91
Closest named color: Cerulean (#457B9D). oklch(55.9% 0.075 217.2), rgb(57, 127, 145).
Aa
Black text reads best on this color (4.61:1).
About this color
#397F91 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 56%, its chroma 0.075 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.028 away. Black text reads best on it, at 4.61:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.61:1 |
| White text | 4.54:1 |
Values
| HEX | #397F91 |
| RGB | rgb(57, 127, 145) |
| HSL | hsl(192, 44%, 40%) |
| OKLCH | oklch(55.9% 0.075 217.2) |
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 #397F91 | 4.54:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #397F91 | 4.61:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #397F91 text on white | 4.54:1 | AA | Lc 71.4 | Content text, not long reading |
| #397F91 text on black | 4.61:1 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECEE
oklch(93.7% 0.01 212.5)
-
Step 200
200
#CCDCE1
oklch(88.4% 0.019 218.4)
-
Step 300
300
#A9C6CF
oklch(80.8% 0.034 218.5)
-
Step 400
400
#7AA9B7
oklch(70.6% 0.054 218.2)
-
Step 500
500
#5694A5
oklch(63.1% 0.069 217.4)
-
Step 600
600 (this color)
#397F91
oklch(55.9% 0.075 217.2)
-
Step 700
700
#2A6A7B
oklch(49.1% 0.07 218.3)
-
Step 800
800
#245764
oklch(42.8% 0.058 217.1)
-
Step 900
900
#234851
oklch(37.8% 0.045 215.5)
-
Step 950
950
#152A30
oklch(27% 0.029 218.2)
#397F91 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) | #737B92 | 0.066 |
| Deuteranopia (no green cones) | #667291 | 0.059 |
| Tritanopia (no blue cones) | #008585 | 0.039 |
| Achromatopsia (no color) | #767676 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397F91
#397F91
oklch(55.9% 0.075 217.2)
- #9B6454
#9B6454
oklch(55.9% 0.076 37)
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 #397F91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.028
- Ocean #017B92 ΔE 0.030
- Teal Blue #01889F ΔE 0.032
- Stormy Blue #507B9C ΔE 0.033
- Metallic Blue #4F738E ΔE 0.038
- Teal #008080 ΔE 0.040
- Dull Blue #49759C ΔE 0.041
- Grey Blue #647D8E ΔE 0.044
Use #397F91 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.