#397FDD
Closest named color: Water Blue (#0E87CC). oklch(60% 0.16 256.8), rgb(57, 127, 221).
Aa
Black text reads best on this color (5.25:1).
About this color
#397FDD is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.160 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.041 away. Black text reads best on it, at 5.25:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.25:1 |
| White text | 3.99:1 |
Values
| HEX | #397FDD |
| RGB | rgb(57, 127, 221) |
| HSL | hsl(214, 71%, 55%) |
| OKLCH | oklch(60% 0.16 256.8) |
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 #397FDD | 3.99:1 | AA large text | Lc -72.4 | Content text, not long reading |
| Black text on #397FDD | 5.25:1 | AA | Lc 37.2 | Non-text elements, placeholder text |
| #397FDD text on white | 3.99:1 | AA large text | Lc 66.9 | Content text, not long reading |
| #397FDD text on black | 5.25:1 | AA | Lc -34.8 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF6
oklch(88.5% 0.043 255.9)
-
Step 300
300
#A1C3F3
oklch(80.9% 0.078 257)
-
Step 400
400
#6CA2ED
oklch(70.6% 0.125 256.8)
-
Step 500
500 (this color)
#397FDD
oklch(60% 0.16 256.8)
-
Step 600
600
#2070D6
oklch(55.5% 0.174 256.9)
-
Step 700
700
#115DB9
oklch(49% 0.161 256.8)
-
Step 800
800
#134D96
oklch(42.8% 0.133 256.7)
-
Step 900
900
#184177
oklch(37.8% 0.103 256.6)
-
Step 950
950
#0F2646
oklch(26.9% 0.066 257.2)
#397FDD 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) | #5187E1 | 0.033 |
| Deuteranopia (no green cones) | #3378DB | 0.020 |
| Tritanopia (no blue cones) | #0095A3 | 0.123 |
| Achromatopsia (no color) | #7F7F7F | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397FDD
#397FDD
oklch(60% 0.16 256.8)
- #AA7400
#AA7400
oklch(60% 0.126 76.4)
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 #397FDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.043
- Windows Blue #3778BF ΔE 0.048
- Clear Blue #247AFD ΔE 0.053
- Soft Blue #6488EA ΔE 0.054
- Royal Blue #4169E1 ΔE 0.057
- Cerulean Blue #056EEE ΔE 0.061
- Dodger Blue #1E90FF ΔE 0.062
Use #397FDD 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.