#397CDE
Closest named color: Water Blue (#0E87CC). oklch(59.4% 0.164 258.2), rgb(57, 124, 222).
Aa
Black text reads best on this color (5.11:1).
About this color
#397CDE is a medium-dark, vivid blue. In OKLCH its lightness is 59%, 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 5.11:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.11:1 |
| White text | 4.10:1 |
Values
| HEX | #397CDE |
| RGB | rgb(57, 124, 222) |
| HSL | hsl(216, 71%, 55%) |
| OKLCH | oklch(59.4% 0.164 258.2) |
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 #397CDE | 4.10:1 | AA large text | Lc -73.3 | Content text, not long reading |
| Black text on #397CDE | 5.11:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #397CDE text on white | 4.10:1 | AA large text | Lc 67.8 | Content text, not long reading |
| #397CDE text on black | 5.11:1 | AA | Lc -33.8 | 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
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C7DBF7
oklch(88.5% 0.044 256.8)
-
Step 300
300
#A1C3F5
oklch(81% 0.08 257.9)
-
Step 400
400
#6DA1F0
oklch(70.6% 0.129 258.5)
-
Step 500
500 (this color)
#397CDE
oklch(59.4% 0.164 258.2)
-
Step 600
600
#236FD9
oklch(55.6% 0.178 258.1)
-
Step 700
700
#155CBC
oklch(49.1% 0.166 258.1)
-
Step 800
800
#154C98
oklch(42.7% 0.137 258)
-
Step 900
900
#194079
oklch(37.7% 0.107 258.2)
-
Step 950
950
#102647
oklch(27% 0.068 258.4)
#397CDE 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) | #4A85E2 | 0.030 |
| Deuteranopia (no green cones) | #2976DC | 0.021 |
| Tritanopia (no blue cones) | #0093A2 | 0.128 |
| Achromatopsia (no color) | #7D7D7D | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397CDE
#397CDE
oklch(59.4% 0.164 258.2)
- #A67300
#A67300
oklch(59.3% 0.124 77.8)
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 #397CDE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.047
- Windows Blue #3778BF ΔE 0.048
- Royal Blue #4169E1 ΔE 0.049
- Clear Blue #247AFD ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.050
- Cerulean Blue #056EEE ΔE 0.054
- Soft Blue #6488EA ΔE 0.059
- Cornflower #6A79F7 ΔE 0.065
Use #397CDE 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.