#3587DB
Closest named color: Dark Sky Blue (#448EE4). oklch(61.5% 0.15 252.1), rgb(53, 135, 219).
Aa
Black text reads best on this color (5.63:1).
About this color
#3587DB is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.150 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.026 away. Black text reads best on it, at 5.63:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.63:1 |
| White text | 3.72:1 |
Values
| HEX | #3587DB |
| RGB | rgb(53, 135, 219) |
| HSL | hsl(210, 70%, 53%) |
| OKLCH | oklch(61.5% 0.15 252.1) |
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 #3587DB | 3.72:1 | AA large text | Lc -69.9 | Content text, not long reading |
| Black text on #3587DB | 5.63:1 | AA | Lc 39.7 | Non-text elements, placeholder text |
| #3587DB text on white | 3.72:1 | AA large text | Lc 64.4 | Content text, not long reading |
| #3587DB text on black | 5.63:1 | AA | Lc -37.3 | 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 500.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF4
oklch(88.6% 0.041 250.6)
-
Step 300
300
#9FC4EF
oklch(80.9% 0.073 252.5)
-
Step 400
400
#68A5E7
oklch(70.8% 0.116 251.5)
-
Step 500
500 (this color)
#3587DB
oklch(61.5% 0.15 252.1)
-
Step 600
600
#0A74CE
oklch(55.5% 0.163 252)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#045091
oklch(42.8% 0.125 251.9)
-
Step 900
900
#124373
oklch(37.8% 0.097 251.8)
-
Step 950
950
#0C2744
oklch(26.9% 0.063 252.6)
#3587DB 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) | #5F8DDE | 0.043 |
| Deuteranopia (no green cones) | #457DD9 | 0.027 |
| Tritanopia (no blue cones) | #009BA6 | 0.113 |
| Achromatopsia (no color) | #848484 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3587DB
#3587DB
oklch(61.5% 0.15 252.1)
- #B47500
#B47500
oklch(61.4% 0.131 72)
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 #3587DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.026
- Water Blue #0E87CC ΔE 0.030
- Chefchaouen Blue #4895EF ΔE 0.049
- Soft Blue #6488EA ΔE 0.050
- Cool Blue #4984B8 ΔE 0.053
- Windows Blue #3778BF ΔE 0.054
- Dodger Blue #1E90FF ΔE 0.055
- Steel Blue #4682B4 ΔE 0.059
Use #3587DB 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.