#357ED0
Closest named color: Windows Blue (#3778BF). oklch(58.8% 0.145 253.7), rgb(53, 126, 208).
Aa
Black text reads best on this color (5.04:1).
About this color
#357ED0 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.145 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.028 away. Black text reads best on it, at 5.04:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.04:1 |
| White text | 4.16:1 |
Values
| HEX | #357ED0 |
| RGB | rgb(53, 126, 208) |
| HSL | hsl(212, 62%, 51%) |
| OKLCH | oklch(58.8% 0.145 253.7) |
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 #357ED0 | 4.16:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #357ED0 | 5.04:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #357ED0 text on white | 4.16:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #357ED0 text on black | 5.04:1 | AA | Lc -33.4 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A4C4EB
oklch(81% 0.065 253.6)
-
Step 400
400
#71A4E0
oklch(70.7% 0.104 253.2)
-
Step 500
500
#4A8CD8
oklch(63.2% 0.134 253.5)
-
Step 600
600 (this color)
#357ED0
oklch(58.8% 0.145 253.7)
-
Step 700
700
#1C61AB
oklch(49.1% 0.136 253.8)
-
Step 800
800
#1A508A
oklch(42.8% 0.111 253.3)
-
Step 900
900
#1C436E
oklch(37.8% 0.086 253)
-
Step 950
950
#122741
oklch(27% 0.056 254.8)
#357ED0 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) | #5784D3 | 0.037 |
| Deuteranopia (no green cones) | #3E76CE | 0.021 |
| Tritanopia (no blue cones) | #00919D | 0.110 |
| Achromatopsia (no color) | #7C7C7C | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #357ED0
#357ED0
oklch(58.8% 0.145 253.7)
- #A86F00
#A86F00
oklch(58.7% 0.125 73.7)
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 #357ED0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.028
- Water Blue #0E87CC ΔE 0.029
- Cool Blue #4984B8 ΔE 0.047
- Steel Blue #4682B4 ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.053
- Nice Blue #107AB0 ΔE 0.055
- Royal Blue #4169E1 ΔE 0.063
- Flat Blue #3C73A8 ΔE 0.064
Use #357ED0 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.