#3591E8
Closest named color: Dark Sky Blue (#448EE4). oklch(64.5% 0.156 250.7), rgb(53, 145, 232).
Aa
Black text reads best on this color (6.36:1).
About this color
#3591E8 is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.156 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.012 away. Black text reads best on it, at 6.36:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.36:1 |
| White text | 3.29:1 |
Values
| HEX | #3591E8 |
| RGB | rgb(53, 145, 232) |
| HSL | hsl(209, 80%, 56%) |
| OKLCH | oklch(64.5% 0.156 250.7) |
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 #3591E8 | 3.29:1 | AA large text | Lc -65.4 | Content text, not long reading |
| Black text on #3591E8 | 6.36:1 | AA | Lc 44.1 | Non-text elements, placeholder text |
| #3591E8 text on white | 3.29:1 | AA large text | Lc 59.9 | Large or bold text, headings |
| #3591E8 text on black | 6.36:1 | AA | Lc -41.8 | 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
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF5
oklch(88.5% 0.042 250.5)
-
Step 300
300
#9CC5F1
oklch(81% 0.076 250.6)
-
Step 400
400
#63A5EA
oklch(70.7% 0.122 250.9)
-
Step 500
500 (this color)
#3591E8
oklch(64.5% 0.156 250.7)
-
Step 600
600
#0075CC
oklch(55.6% 0.16 250.6)
-
Step 700
700
#0062AD
oklch(49.1% 0.142 250.8)
-
Step 800
800
#00508F
oklch(42.6% 0.123 250.8)
-
Step 900
900
#094375
oklch(37.7% 0.102 250.6)
-
Step 950
950
#092844
oklch(27.1% 0.063 249.6)
#3591E8 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) | #6896EC | 0.048 |
| Deuteranopia (no green cones) | #4C86E6 | 0.031 |
| Tritanopia (no blue cones) | #00A6B1 | 0.116 |
| Achromatopsia (no color) | #8D8D8D | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3591E8
#3591E8
oklch(64.5% 0.156 250.7)
- #C27C00
#C27C00
oklch(64.5% 0.139 70.4)
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 #3591E8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.012
- Chefchaouen Blue #4895EF ΔE 0.021
- Dodger Blue #1E90FF ΔE 0.036
- Cornflower Blue #6495ED ΔE 0.043
- Soft Blue #6488EA ΔE 0.044
- Water Blue #0E87CC ΔE 0.053
- Clear Blue #247AFD ΔE 0.073
- Cool Blue #4984B8 ΔE 0.074
Use #3591E8 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.