#357FBC
Closest named color: Windows Blue (#3778BF). oklch(57.9% 0.119 246.8), rgb(53, 127, 188).
Aa
Black text reads best on this color (4.91:1).
About this color
#357FBC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.119 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.021 away. Black text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.91:1 |
| White text | 4.27:1 |
Values
| HEX | #357FBC |
| RGB | rgb(53, 127, 188) |
| HSL | hsl(207, 56%, 47%) |
| OKLCH | oklch(57.9% 0.119 246.8) |
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 #357FBC | 4.27:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #357FBC | 4.91:1 | AA | Lc 34.8 | Non-text elements, placeholder text |
| #357FBC text on white | 4.27:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #357FBC text on black | 4.91:1 | AA | Lc -32.4 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADCEC
oklch(88.6% 0.029 244.9)
-
Step 300
300
#A5C5E2
oklch(81% 0.054 245.9)
-
Step 400
400
#74A6D3
oklch(70.7% 0.085 246.5)
-
Step 500
500
#4D8FC8
oklch(63.1% 0.11 246.7)
-
Step 600
600 (this color)
#357FBC
oklch(57.9% 0.119 246.8)
-
Step 700
700
#1F659B
oklch(49.1% 0.11 246.4)
-
Step 800
800
#1C527E
oklch(42.6% 0.092 247)
-
Step 900
900
#1E4465
oklch(37.6% 0.071 247.3)
-
Step 950
950
#12283B
oklch(26.9% 0.045 246.6)
#357FBC 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) | #6381BF | 0.047 |
| Deuteranopia (no green cones) | #5075BB | 0.034 |
| Tritanopia (no blue cones) | #008E95 | 0.088 |
| Achromatopsia (no color) | #7A7A7A | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #357FBC
#357FBC
oklch(57.9% 0.119 246.8)
- #A86A19
#A86A19
oklch(57.9% 0.119 67)
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 #357FBC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.021
- Steel Blue #4682B4 ΔE 0.022
- Cool Blue #4984B8 ΔE 0.025
- Water Blue #0E87CC ΔE 0.031
- Nice Blue #107AB0 ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.041
- Blue NCS #118AB2 ΔE 0.041
- Off Blue #5684AE ΔE 0.042
Use #357FBC 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.