#397DA5
Closest named color: Cerulean (#457B9D). oklch(56.3% 0.092 237.4), rgb(57, 125, 165).
Aa
Black text reads best on this color (4.65:1).
About this color
#397DA5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.092 and its hue 237°. 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 4.65:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.65:1 |
| White text | 4.51:1 |
Values
| HEX | #397DA5 |
| RGB | rgb(57, 125, 165) |
| HSL | hsl(202, 49%, 44%) |
| OKLCH | oklch(56.3% 0.092 237.4) |
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 #397DA5 | 4.51:1 | AA | Lc -76.6 | Fine for body text |
| Black text on #397DA5 | 4.65:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #397DA5 text on white | 4.51:1 | AA | Lc 71.1 | Content text, not long reading |
| #397DA5 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDCE7
oklch(88.6% 0.023 237.7)
-
Step 300
300
#A8C5D9
oklch(80.8% 0.042 238.2)
-
Step 400
400
#79A7C5
oklch(70.6% 0.066 237.5)
-
Step 500
500
#5491B7
oklch(63.1% 0.086 237.6)
-
Step 600
600 (this color)
#397DA5
oklch(56.3% 0.092 237.4)
-
Step 700
700
#28678B
oklch(49% 0.086 237.4)
-
Step 800
800
#235471
oklch(42.6% 0.071 237.7)
-
Step 900
900
#22465B
oklch(37.7% 0.055 236.3)
-
Step 950
950
#152936
oklch(27% 0.036 238.5)
#397DA5 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) | #6A7CA7 | 0.053 |
| Deuteranopia (no green cones) | #5B72A4 | 0.043 |
| Tritanopia (no blue cones) | #00878B | 0.063 |
| Achromatopsia (no color) | #767676 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397DA5
#397DA5
oklch(56.3% 0.092 237.4)
- #9E673C
#9E673C
oklch(56.4% 0.092 57.5)
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 #397DA5, 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 0.025
- Steel Blue #4682B4 ΔE 0.029
- Nice Blue #107AB0 ΔE 0.030
- Flat Blue #3C73A8 ΔE 0.031
- Muted Blue #3B719F ΔE 0.034
- Cool Blue #4984B8 ΔE 0.038
Use #397DA5 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.