#3591DB
Closest named color: Dark Sky Blue (#448EE4). oklch(63.7% 0.14 246.9), rgb(53, 145, 219).
Aa
Black text reads best on this color (6.22:1).
About this color
#3591DB is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.140 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.020 away. Black text reads best on it, at 6.22:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.22:1 |
| White text | 3.37:1 |
Values
| HEX | #3591DB |
| RGB | rgb(53, 145, 219) |
| HSL | hsl(207, 70%, 53%) |
| OKLCH | oklch(63.7% 0.14 246.9) |
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 #3591DB | 3.37:1 | AA large text | Lc -66.3 | Content text, not long reading |
| Black text on #3591DB | 6.22:1 | AA | Lc 43.2 | Non-text elements, placeholder text |
| #3591DB text on white | 3.37:1 | AA large text | Lc 60.8 | Content text, not long reading |
| #3591DB text on black | 6.22:1 | AA | Lc -40.9 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF2
oklch(88.5% 0.038 248.3)
-
Step 300
300
#9DC5EB
oklch(80.8% 0.069 247.4)
-
Step 400
400
#65A7E1
oklch(70.8% 0.109 246.6)
-
Step 500
500 (this color)
#3591DB
oklch(63.7% 0.14 246.9)
-
Step 600
600
#0078C3
oklch(55.7% 0.146 246.8)
-
Step 700
700
#0064A5
oklch(49% 0.13 247.2)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#0B446F
oklch(37.6% 0.092 247.3)
-
Step 950
950
#0A2841
oklch(26.9% 0.058 247.4)
#3591DB 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) | #6F94DE | 0.054 |
| Deuteranopia (no green cones) | #5785DA | 0.039 |
| Tritanopia (no blue cones) | #00A3AC | 0.101 |
| Achromatopsia (no color) | #8C8C8C | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3591DB
#3591DB
oklch(63.7% 0.14 246.9)
- #C37803
#C37803
oklch(63.9% 0.14 67.1)
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 #3591DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.020
- Chefchaouen Blue #4895EF ΔE 0.035
- Water Blue #0E87CC ΔE 0.040
- Cornflower Blue #6495ED ΔE 0.051
- Soft Blue #6488EA ΔE 0.053
- Dodger Blue #1E90FF ΔE 0.055
- Cool Blue #4984B8 ΔE 0.057
- Faded Blue #658CBB ΔE 0.058
Use #3591DB 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.