#397BE8
Closest named color: Clear Blue (#247AFD). oklch(59.8% 0.178 259.9), rgb(57, 123, 232).
Aa
Black text reads best on this color (5.17:1).
About this color
#397BE8 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.178 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.034 away. Black text reads best on it, at 5.17:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.17:1 |
| White text | 4.06:1 |
Values
| HEX | #397BE8 |
| RGB | rgb(57, 123, 232) |
| HSL | hsl(217, 79%, 57%) |
| OKLCH | oklch(59.8% 0.178 259.9) |
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 #397BE8 | 4.06:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #397BE8 | 5.17:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #397BE8 text on white | 4.06:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #397BE8 text on black | 5.17:1 | AA | Lc -34.3 | 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
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C7DAFA
oklch(88.4% 0.049 260.9)
-
Step 300
300
#A0C2F9
oklch(80.9% 0.087 259.9)
-
Step 400
400
#6BA0F7
oklch(70.7% 0.14 259.9)
-
Step 500
500 (this color)
#397BE8
oklch(59.8% 0.178 259.9)
-
Step 600
600
#226CE2
oklch(55.6% 0.194 259.9)
-
Step 700
700
#1559C4
oklch(49% 0.18 259.9)
-
Step 800
800
#144A9F
oklch(42.8% 0.149 259.7)
-
Step 900
900
#183F7E
oklch(37.8% 0.116 259.7)
-
Step 950
950
#0F254A
oklch(27% 0.074 260.2)
#397BE8 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) | #3F87EC | 0.033 |
| Deuteranopia (no green cones) | #0577E6 | 0.028 |
| Tritanopia (no blue cones) | #0095A6 | 0.140 |
| Achromatopsia (no color) | #7E7E7E | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397BE8
#397BE8
oklch(59.8% 0.178 259.9)
- #A67600
#A67600
oklch(59.9% 0.124 80.2)
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 #397BE8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.034
- Royal Blue #4169E1 ΔE 0.045
- Cerulean Blue #056EEE ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.054
- Cornflower #6A79F7 ΔE 0.056
- Soft Blue #6488EA ΔE 0.058
- Dodger Blue #1E90FF ΔE 0.059
- Water Blue #0E87CC ΔE 0.061
Use #397BE8 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.