#397FCE
Closest named color: Water Blue (#0E87CC). oklch(59% 0.14 253.6), rgb(57, 127, 206).
Aa
Black text reads best on this color (5.10:1).
About this color
#397FCE is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.140 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.028 away. Black text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.10:1 |
| White text | 4.11:1 |
Values
| HEX | #397FCE |
| RGB | rgb(57, 127, 206) |
| HSL | hsl(212, 60%, 52%) |
| OKLCH | oklch(59% 0.14 253.6) |
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 #397FCE | 4.11:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #397FCE | 5.10:1 | AA | Lc 36.1 | Non-text elements, placeholder text |
| #397FCE text on white | 4.11:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #397FCE text on black | 5.10:1 | AA | Lc -33.7 | 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 600.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CADBF0
oklch(88.5% 0.034 253.7)
-
Step 300
300
#A5C4E9
oklch(81% 0.062 253.1)
-
Step 400
400
#73A4DE
oklch(70.7% 0.1 253.3)
-
Step 500
500
#4D8CD5
oklch(63.1% 0.128 253.5)
-
Step 600
600 (this color)
#397FCE
oklch(59% 0.14 253.6)
-
Step 700
700
#2061A8
oklch(49% 0.131 253.7)
-
Step 800
800
#1D5088
oklch(42.8% 0.108 253.4)
-
Step 900
900
#1E436D
oklch(37.8% 0.084 253.4)
-
Step 950
950
#122740
oklch(26.9% 0.054 254)
#397FCE 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) | #5A85D1 | 0.037 |
| Deuteranopia (no green cones) | #4477CC | 0.022 |
| Tritanopia (no blue cones) | #00929C | 0.109 |
| Achromatopsia (no color) | #7D7D7D | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397FCE
#397FCE
oklch(59% 0.14 253.6)
- #A97000
#A97000
oklch(59.1% 0.125 73.9)
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 #397FCE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.028
- Windows Blue #3778BF ΔE 0.028
- Cool Blue #4984B8 ΔE 0.042
- Steel Blue #4682B4 ΔE 0.044
- Dark Sky Blue #448EE4 ΔE 0.051
- Nice Blue #107AB0 ΔE 0.055
- Off Blue #5684AE ΔE 0.060
- Flat Blue #3C73A8 ΔE 0.062
Use #397FCE 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.