#397BF0
Closest named color: Clear Blue (#247AFD). oklch(60.4% 0.189 260.9), rgb(57, 123, 240).
Aa
Black text reads best on this color (5.26:1).
About this color
#397BF0 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.189 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.023 away. Black text reads best on it, at 5.26:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.189) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.26:1 |
| White text | 3.98:1 |
Values
| HEX | #397BF0 |
| RGB | rgb(57, 123, 240) |
| HSL | hsl(218, 86%, 58%) |
| OKLCH | oklch(60.4% 0.189 260.9) |
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 #397BF0 | 3.98:1 | AA large text | Lc -72.2 | Content text, not long reading |
| Black text on #397BF0 | 5.26:1 | AA | Lc 37.4 | Non-text elements, placeholder text |
| #397BF0 text on white | 3.98:1 | AA large text | Lc 66.7 | Content text, not long reading |
| #397BF0 text on black | 5.26:1 | AA | Lc -34.9 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9FC2FD
oklch(81% 0.092 260.7)
-
Step 400
400
#6A9FFC
oklch(70.7% 0.148 261)
-
Step 500
500 (this color)
#397BF0
oklch(60.4% 0.189 260.9)
-
Step 600
600
#216AE9
oklch(55.7% 0.205 260.8)
-
Step 700
700
#1357CA
oklch(49.1% 0.19 260.8)
-
Step 800
800
#1348A3
oklch(42.7% 0.157 260.7)
-
Step 900
900
#173D82
oklch(37.6% 0.124 261.1)
-
Step 950
950
#0E254C
oklch(27.1% 0.078 260.3)
#397BF0 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) | #3588F4 | 0.033 |
| Deuteranopia (no green cones) | #0077EE | 0.028 |
| Tritanopia (no blue cones) | #0097AA | 0.147 |
| Achromatopsia (no color) | #7F7F7F | 0.189 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397BF0
#397BF0
oklch(60.4% 0.189 260.9)
- #A77800
#A77800
oklch(60.4% 0.125 81.1)
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 #397BF0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.023
- Cerulean Blue #056EEE ΔE 0.045
- Royal Blue #4169E1 ΔE 0.048
- Cornflower #6A79F7 ΔE 0.051
- Dodger Blue #1E90FF ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.058
- Soft Blue #6488EA ΔE 0.059
- Neon Blue #4361EE ΔE 0.061
Use #397BF0 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.