#397DDF
Closest named color: Water Blue (#0E87CC). oklch(59.7% 0.164 258), rgb(57, 125, 223).
Aa
Black text reads best on this color (5.17:1).
About this color
#397DDF is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.164 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.047 away. Black text reads best on it, at 5.17:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.17:1 |
| White text | 4.05:1 |
Values
| HEX | #397DDF |
| RGB | rgb(57, 125, 223) |
| HSL | hsl(215, 72%, 55%) |
| OKLCH | oklch(59.7% 0.164 258) |
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 #397DDF | 4.05:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #397DDF | 5.17:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #397DDF text on white | 4.05:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #397DDF text on black | 5.17:1 | AA | Lc -34.2 | 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 500.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF7
oklch(88.5% 0.044 256.8)
-
Step 300
300
#A1C3F5
oklch(81% 0.08 257.9)
-
Step 400
400
#6CA2F0
oklch(70.8% 0.129 257.6)
-
Step 500
500 (this color)
#397DDF
oklch(59.7% 0.164 258)
-
Step 600
600
#226FD9
oklch(55.6% 0.179 257.9)
-
Step 700
700
#145CBC
oklch(49% 0.166 258)
-
Step 800
800
#144C98
oklch(42.7% 0.137 257.8)
-
Step 900
900
#184079
oklch(37.7% 0.107 257.9)
-
Step 950
950
#0F2647
oklch(27% 0.068 257.7)
#397DDF 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) | #4B86E3 | 0.031 |
| Deuteranopia (no green cones) | #2A77DD | 0.021 |
| Tritanopia (no blue cones) | #0094A3 | 0.128 |
| Achromatopsia (no color) | #7E7E7E | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397DDF
#397DDF
oklch(59.7% 0.164 258)
- #A77400
#A77400
oklch(59.6% 0.124 78.1)
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 #397DDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.048
- Clear Blue #247AFD ΔE 0.048
- Windows Blue #3778BF ΔE 0.049
- Royal Blue #4169E1 ΔE 0.051
- Cerulean Blue #056EEE ΔE 0.055
- Soft Blue #6488EA ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.063
Use #397DDF 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.