#3580EB
Closest named color: Clear Blue (#247AFD). oklch(61% 0.178 258), rgb(53, 128, 235).
Aa
Black text reads best on this color (5.43:1).
About this color
#3580EB is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.178 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.034 away. Black text reads best on it, at 5.43:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.43:1 |
| White text | 3.86:1 |
Values
| HEX | #3580EB |
| RGB | rgb(53, 128, 235) |
| HSL | hsl(215, 82%, 56%) |
| OKLCH | oklch(61% 0.178 258) |
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 #3580EB | 3.86:1 | AA large text | Lc -71.1 | Content text, not long reading |
| Black text on #3580EB | 5.43:1 | AA | Lc 38.5 | Non-text elements, placeholder text |
| #3580EB text on white | 3.86:1 | AA large text | Lc 65.6 | Content text, not long reading |
| #3580EB text on black | 5.43:1 | AA | Lc -36.0 | 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 500.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9EC3F9
oklch(81% 0.087 257.7)
-
Step 400
400
#68A1F6
oklch(70.7% 0.139 258.2)
-
Step 500
500 (this color)
#3580EB
oklch(61% 0.178 258)
-
Step 600
600
#146DE1
oklch(55.5% 0.194 258)
-
Step 700
700
#035BC4
oklch(49.2% 0.18 257.9)
-
Step 800
800
#0A4B9E
oklch(42.8% 0.148 257.8)
-
Step 900
900
#133F7E
oklch(37.6% 0.117 258.2)
-
Step 950
950
#0D2649
oklch(27.1% 0.072 257.4)
#3580EB 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) | #478BEF | 0.034 |
| Deuteranopia (no green cones) | #197AE9 | 0.024 |
| Tritanopia (no blue cones) | #0099AA | 0.136 |
| Achromatopsia (no color) | #828282 | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3580EB
#3580EB
oklch(61% 0.178 258)
- #AC7800
#AC7800
oklch(61% 0.127 78.4)
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 #3580EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.034
- Dark Sky Blue #448EE4 ΔE 0.044
- Dodger Blue #1E90FF ΔE 0.047
- Soft Blue #6488EA ΔE 0.051
- Cerulean Blue #056EEE ΔE 0.055
- Cornflower #6A79F7 ΔE 0.057
- Water Blue #0E87CC ΔE 0.057
- Royal Blue #4169E1 ΔE 0.058
Use #3580EB 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.