#397FCF
Closest named color: Water Blue (#0E87CC). oklch(59.1% 0.141 253.8), rgb(57, 127, 207).
Aa
Black text reads best on this color (5.11:1).
About this color
#397FCF is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.141 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 5.11:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.11:1 |
| White text | 4.10:1 |
Values
| HEX | #397FCF |
| RGB | rgb(57, 127, 207) |
| HSL | hsl(212, 61%, 52%) |
| OKLCH | oklch(59.1% 0.141 253.8) |
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 #397FCF | 4.10:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #397FCF | 5.11:1 | AA | Lc 36.2 | Non-text elements, placeholder text |
| #397FCF text on white | 4.10:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #397FCF text on black | 5.11:1 | AA | Lc -33.8 | 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 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
#CADBF1
oklch(88.6% 0.035 254.9)
-
Step 300
300
#A5C4EA
oklch(81% 0.064 253.7)
-
Step 400
400
#73A4DF
oklch(70.8% 0.102 253.7)
-
Step 500
500
#4D8CD6
oklch(63.2% 0.13 253.8)
-
Step 600
600 (this color)
#397FCF
oklch(59.1% 0.141 253.8)
-
Step 700
700
#2061A9
oklch(49.1% 0.132 254)
-
Step 800
800
#1D5089
oklch(42.8% 0.109 253.8)
-
Step 900
900
#1E436D
oklch(37.8% 0.084 253.4)
-
Step 950
950
#122740
oklch(26.9% 0.054 254)
#397FCF 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) | #5A85D2 | 0.037 |
| Deuteranopia (no green cones) | #4377CD | 0.021 |
| Tritanopia (no blue cones) | #00929D | 0.109 |
| Achromatopsia (no color) | #7D7D7D | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #397FCF
#397FCF
oklch(59.1% 0.141 253.8)
- #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 #397FCF, 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 0.029
- Cool Blue #4984B8 ΔE 0.043
- Steel Blue #4682B4 ΔE 0.045
- Dark Sky Blue #448EE4 ΔE 0.050
- Nice Blue #107AB0 ΔE 0.056
- Off Blue #5684AE ΔE 0.061
- Flat Blue #3C73A8 ΔE 0.063
Use #397FCF 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.