#3591DF
Closest named color: Dark Sky Blue (#448EE4). oklch(64% 0.145 248.2), rgb(53, 145, 223).
Aa
Black text reads best on this color (6.26:1).
About this color
#3591DF is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.145 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.015 away. Black text reads best on it, at 6.26:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.26:1 |
| White text | 3.35:1 |
Values
| HEX | #3591DF |
| RGB | rgb(53, 145, 223) |
| HSL | hsl(208, 73%, 54%) |
| OKLCH | oklch(64% 0.145 248.2) |
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 #3591DF | 3.35:1 | AA large text | Lc -66.0 | Content text, not long reading |
| Black text on #3591DF | 6.26:1 | AA | Lc 43.5 | Non-text elements, placeholder text |
| #3591DF text on white | 3.35:1 | AA large text | Lc 60.6 | Content text, not long reading |
| #3591DF text on black | 6.26:1 | AA | Lc -41.2 | 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
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C5DCF3
oklch(88.5% 0.04 248.3)
-
Step 300
300
#9DC5ED
oklch(80.9% 0.071 248.7)
-
Step 400
400
#64A6E4
oklch(70.7% 0.114 248.3)
-
Step 500
500 (this color)
#3591DF
oklch(64% 0.145 248.2)
-
Step 600
600
#0077C6
oklch(55.6% 0.15 248.2)
-
Step 700
700
#0064A7
oklch(49.1% 0.132 247.9)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#0B4471
oklch(37.7% 0.095 248.3)
-
Step 950
950
#0A2842
oklch(27% 0.06 248.4)
#3591DF 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) | #6D95E2 | 0.053 |
| Deuteranopia (no green cones) | #5485DD | 0.036 |
| Tritanopia (no blue cones) | #00A4AD | 0.107 |
| Achromatopsia (no color) | #8C8C8C | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3591DF
#3591DF
oklch(64% 0.145 248.2)
- #C27900
#C27900
oklch(63.9% 0.14 68.4)
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 #3591DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.015
- Chefchaouen Blue #4895EF ΔE 0.030
- Water Blue #0E87CC ΔE 0.043
- Cornflower Blue #6495ED ΔE 0.048
- Dodger Blue #1E90FF ΔE 0.049
- Soft Blue #6488EA ΔE 0.049
- Cool Blue #4984B8 ΔE 0.062
- Faded Blue #658CBB ΔE 0.063
Use #3591DF 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.