#397FD6
Closest named color: Water Blue (#0E87CC). oklch(59.5% 0.151 255.4), rgb(57, 127, 214).
Aa
Black text reads best on this color (5.18:1).
About this color
#397FD6 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.151 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.034 away. Black text reads best on it, at 5.18:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.18:1 |
| White text | 4.05:1 |
Values
| HEX | #397FD6 |
| RGB | rgb(57, 127, 214) |
| HSL | hsl(213, 66%, 53%) |
| OKLCH | oklch(59.5% 0.151 255.4) |
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 #397FD6 | 4.05:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #397FD6 | 5.18:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #397FD6 text on white | 4.05:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #397FD6 text on black | 5.18:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A1C3F0
oklch(80.8% 0.074 255.6)
-
Step 400
400
#6DA3E9
oklch(70.7% 0.118 255.4)
-
Step 500
500 (this color)
#397FD6
oklch(59.5% 0.151 255.4)
-
Step 600
600
#2272D0
oklch(55.6% 0.163 255.5)
-
Step 700
700
#135FB4
oklch(49.1% 0.152 255.4)
-
Step 800
800
#144E92
oklch(42.7% 0.126 255.5)
-
Step 900
900
#184274
oklch(37.8% 0.097 254.8)
-
Step 950
950
#102744
oklch(27.1% 0.062 255.3)
#397FD6 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) | #5586D9 | 0.034 |
| Deuteranopia (no green cones) | #3B77D4 | 0.021 |
| Tritanopia (no blue cones) | #0093A0 | 0.115 |
| Achromatopsia (no color) | #7E7E7E | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397FD6
#397FD6
oklch(59.5% 0.151 255.4)
- #A97200
#A97200
oklch(59.5% 0.125 75.4)
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 #397FD6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.034
- Windows Blue #3778BF ΔE 0.038
- Dark Sky Blue #448EE4 ΔE 0.045
- Cool Blue #4984B8 ΔE 0.053
- Steel Blue #4682B4 ΔE 0.056
- Soft Blue #6488EA ΔE 0.059
- Royal Blue #4169E1 ΔE 0.061
- Clear Blue #247AFD ΔE 0.063
Use #397FD6 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.