#397AF3
Closest named color: Clear Blue (#247AFD). oklch(60.4% 0.194 261.4), rgb(57, 122, 243).
Aa
Black text reads best on this color (5.25:1).
About this color
#397AF3 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.194 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.019 away. Black text reads best on it, at 5.25:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.194) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.25:1 |
| White text | 3.99:1 |
Values
| HEX | #397AF3 |
| RGB | rgb(57, 122, 243) |
| HSL | hsl(219, 89%, 59%) |
| OKLCH | oklch(60.4% 0.194 261.4) |
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 #397AF3 | 3.99:1 | AA large text | Lc -72.3 | Content text, not long reading |
| Black text on #397AF3 | 5.25:1 | AA | Lc 37.3 | Non-text elements, placeholder text |
| #397AF3 text on white | 3.99:1 | AA large text | Lc 66.8 | Content text, not long reading |
| #397AF3 text on black | 5.25:1 | 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
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C6DAFD
oklch(88.5% 0.053 261.7)
-
Step 300
300
#9FC1FE
oklch(80.8% 0.094 261.9)
-
Step 400
400
#6A9FFE
oklch(70.8% 0.151 261.3)
-
Step 500
500 (this color)
#397AF3
oklch(60.4% 0.194 261.4)
-
Step 600
600
#2168EC
oklch(55.6% 0.211 261.5)
-
Step 700
700
#1456CD
oklch(49.2% 0.195 261.3)
-
Step 800
800
#1447A6
oklch(42.7% 0.162 261.5)
-
Step 900
900
#173D83
oklch(37.7% 0.126 261.3)
-
Step 950
950
#0E244D
oklch(26.9% 0.081 261.5)
#397AF3 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) | #2E88F7 | 0.035 |
| Deuteranopia (no green cones) | #0077F1 | 0.027 |
| Tritanopia (no blue cones) | #0097AB | 0.151 |
| Achromatopsia (no color) | #7F7F7F | 0.194 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397AF3
#397AF3
oklch(60.4% 0.194 261.4)
- #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 #397AF3, closest first.
No curated palette has a color within ΔE 0.04 of #397AF3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.019
- Cerulean Blue #056EEE ΔE 0.043
- Royal Blue #4169E1 ΔE 0.047
- Cornflower #6A79F7 ΔE 0.051
- Dodger Blue #1E90FF ΔE 0.056
- Neon Blue #4361EE ΔE 0.059
- Soft Blue #6488EA ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.062
Use #397AF3 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.