#357ECF
Closest named color: Windows Blue (#3778BF). oklch(58.7% 0.144 253.4), rgb(53, 126, 207).
Aa
Black text reads best on this color (5.03:1).
About this color
#357ECF is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.144 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.027 away. Black text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.03:1 |
| White text | 4.16:1 |
Values
| HEX | #357ECF |
| RGB | rgb(53, 126, 207) |
| HSL | hsl(212, 62%, 51%) |
| OKLCH | oklch(58.7% 0.144 253.4) |
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 #357ECF | 4.16:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #357ECF | 5.03:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #357ECF text on white | 4.16:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #357ECF text on black | 5.03:1 | AA | Lc -33.3 | 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
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A4C4EA
oklch(81% 0.064 253)
-
Step 400
400
#72A4E0
oklch(70.7% 0.103 253.6)
-
Step 500
500
#4A8CD7
oklch(63.1% 0.132 253.2)
-
Step 600
600 (this color)
#357ECF
oklch(58.7% 0.144 253.4)
-
Step 700
700
#1D61AA
oklch(49.1% 0.134 253.7)
-
Step 800
800
#1A508A
oklch(42.8% 0.111 253.3)
-
Step 900
900
#1C436E
oklch(37.8% 0.086 253)
-
Step 950
950
#122740
oklch(26.9% 0.054 254)
#357ECF 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) | #5884D2 | 0.038 |
| Deuteranopia (no green cones) | #3F76CD | 0.021 |
| Tritanopia (no blue cones) | #00919C | 0.110 |
| Achromatopsia (no color) | #7C7C7C | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #357ECF
#357ECF
oklch(58.7% 0.144 253.4)
- #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 #357ECF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.027
- Water Blue #0E87CC ΔE 0.029
- Cool Blue #4984B8 ΔE 0.046
- Steel Blue #4682B4 ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.053
- Nice Blue #107AB0 ΔE 0.054
- Flat Blue #3C73A8 ΔE 0.062
- Off Blue #5684AE ΔE 0.064
Use #357ECF 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.