#357FC3
Closest named color: Windows Blue (#3778BF). oklch(58.3% 0.128 249.4), rgb(53, 127, 195).
Aa
Black text reads best on this color (4.97:1).
About this color
#357FC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.128 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.019 away. Black text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.97:1 |
| White text | 4.22:1 |
Values
| HEX | #357FC3 |
| RGB | rgb(53, 127, 195) |
| HSL | hsl(209, 57%, 49%) |
| OKLCH | oklch(58.3% 0.128 249.4) |
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 #357FC3 | 4.22:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #357FC3 | 4.97:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #357FC3 text on white | 4.22:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #357FC3 text on black | 4.97:1 | AA | Lc -32.9 | 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
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEE
oklch(88.5% 0.032 251.1)
-
Step 300
300
#A5C4E5
oklch(80.9% 0.058 250.2)
-
Step 400
400
#73A5D8
oklch(70.7% 0.092 249.7)
-
Step 500
500
#4C8ECD
oklch(63.1% 0.117 249.2)
-
Step 600
600 (this color)
#357FC3
oklch(58.3% 0.128 249.4)
-
Step 700
700
#1E64A1
oklch(49.2% 0.119 249.3)
-
Step 800
800
#1C5282
oklch(42.8% 0.097 249.1)
-
Step 900
900
#1D4468
oklch(37.7% 0.076 248.9)
-
Step 950
950
#12283D
oklch(27% 0.048 249)
#357FC3 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) | #6083C6 | 0.045 |
| Deuteranopia (no green cones) | #4C75C2 | 0.031 |
| Tritanopia (no blue cones) | #008F98 | 0.094 |
| Achromatopsia (no color) | #7B7B7B | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #357FC3
#357FC3
oklch(58.3% 0.128 249.4)
- #AA6B00
#AA6B00
oklch(58.2% 0.126 69.6)
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 #357FC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.019
- Water Blue #0E87CC ΔE 0.026
- Steel Blue #4682B4 ΔE 0.030
- Cool Blue #4984B8 ΔE 0.030
- Nice Blue #107AB0 ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.048
- Blue NCS #118AB2 ΔE 0.048
- Off Blue #5684AE ΔE 0.048
Use #357FC3 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.