#397CE0
Closest named color: Clear Blue (#247AFD). oklch(59.5% 0.167 258.5), rgb(57, 124, 224).
Aa
Black text reads best on this color (5.13:1).
About this color
#397CE0 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.167 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.046 away. Black text reads best on it, at 5.13:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.13:1 |
| White text | 4.09:1 |
Values
| HEX | #397CE0 |
| RGB | rgb(57, 124, 224) |
| HSL | hsl(216, 73%, 55%) |
| OKLCH | oklch(59.5% 0.167 258.5) |
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 #397CE0 | 4.09:1 | AA large text | Lc -73.2 | Content text, not long reading |
| Black text on #397CE0 | 5.13:1 | AA | Lc 36.4 | Non-text elements, placeholder text |
| #397CE0 text on white | 4.09:1 | AA large text | Lc 67.7 | Content text, not long reading |
| #397CE0 text on black | 5.13:1 | AA | Lc -34.0 | 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
#C7DBF8
oklch(88.6% 0.046 257.6)
-
Step 300
300
#A1C2F6
oklch(80.8% 0.082 259.4)
-
Step 400
400
#6DA1F1
oklch(70.7% 0.13 258.7)
-
Step 500
500 (this color)
#397CE0
oklch(59.5% 0.167 258.5)
-
Step 600
600
#236EDB
oklch(55.5% 0.182 258.6)
-
Step 700
700
#155CBE
oklch(49.2% 0.168 258.4)
-
Step 800
800
#154B9A
oklch(42.7% 0.141 258.7)
-
Step 900
900
#19407A
oklch(37.8% 0.108 258.5)
-
Step 950
950
#0F2647
oklch(27% 0.068 257.7)
#397CE0 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) | #4886E4 | 0.031 |
| Deuteranopia (no green cones) | #2576DE | 0.023 |
| Tritanopia (no blue cones) | #0094A3 | 0.131 |
| Achromatopsia (no color) | #7D7D7D | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397CE0
#397CE0
oklch(59.5% 0.167 258.5)
- #A67400
#A67400
oklch(59.5% 0.124 78.6)
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 #397CE0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.046
- Royal Blue #4169E1 ΔE 0.048
- Water Blue #0E87CC ΔE 0.050
- Dark Sky Blue #448EE4 ΔE 0.050
- Windows Blue #3778BF ΔE 0.051
- Cerulean Blue #056EEE ΔE 0.052
- Soft Blue #6488EA ΔE 0.058
- Cornflower #6A79F7 ΔE 0.063
Use #397CE0 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.