#397EFF
Closest named color: Clear Blue (#247AFD). oklch(62.1% 0.205 261.5), rgb(57, 126, 255).
Aa
Black text reads best on this color (5.60:1).
About this color
#397EFF is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.205 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.018 away. Black text reads best on it, at 5.60:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.205) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.60:1 |
| White text | 3.74:1 |
Values
| HEX | #397EFF |
| RGB | rgb(57, 126, 255) |
| HSL | hsl(219, 100%, 61%) |
| OKLCH | oklch(62.1% 0.205 261.5) |
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 #397EFF | 3.74:1 | AA large text | Lc -70.0 | Content text, not long reading |
| Black text on #397EFF | 5.60:1 | AA | Lc 39.6 | Non-text elements, placeholder text |
| #397EFF text on white | 3.74:1 | AA large text | Lc 64.5 | Content text, not long reading |
| #397EFF text on black | 5.60:1 | AA | Lc -37.2 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFE
oklch(93.7% 0.029 259.6)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#699EFF
oklch(70.6% 0.153 261.6)
-
Step 500
500 (this color)
#397EFF
oklch(62.1% 0.205 261.5)
-
Step 600
600
#1A66F2
oklch(55.5% 0.222 261.5)
-
Step 700
700
#0C54D3
oklch(49.2% 0.206 261.4)
-
Step 800
800
#0E45AA
oklch(42.6% 0.171 261.5)
-
Step 900
900
#143C87
oklch(37.7% 0.134 261.5)
-
Step 950
950
#0D244F
oklch(27% 0.084 261.5)
#397EFF 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) | #288DFF | 0.037 |
| Deuteranopia (no green cones) | #007BFC | 0.026 |
| Tritanopia (no blue cones) | #009DB3 | 0.158 |
| Achromatopsia (no color) | #848484 | 0.205 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397EFF
#397EFF
oklch(62.1% 0.205 261.5)
- #AD7D00
#AD7D00
oklch(62.1% 0.128 81.5)
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 #397EFF, closest first.
No curated palette has a color within ΔE 0.04 of #397EFF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.018
- Dodger Blue #1E90FF ΔE 0.045
- Cornflower #6A79F7 ΔE 0.049
- Cerulean Blue #056EEE ΔE 0.056
- Soft Blue #6488EA ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.063
- Royal Blue #4169E1 ΔE 0.065
- Chefchaouen Blue #4895EF ΔE 0.070
Use #397EFF 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.