#3591CB
Closest named color: Water Blue (#0E87CC). oklch(62.9% 0.122 240.7), rgb(53, 145, 203).
Aa
Black text reads best on this color (6.06:1).
About this color
#3591CB is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.122 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.036 away. Black text reads best on it, at 6.06:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 6.06:1 |
| White text | 3.46:1 |
Values
| HEX | #3591CB |
| RGB | rgb(53, 145, 203) |
| HSL | hsl(203, 59%, 50%) |
| OKLCH | oklch(62.9% 0.122 240.7) |
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 #3591CB | 3.46:1 | AA large text | Lc -67.3 | Content text, not long reading |
| Black text on #3591CB | 6.06:1 | AA | Lc 42.2 | Non-text elements, placeholder text |
| #3591CB text on white | 3.46:1 | AA large text | Lc 61.8 | Content text, not long reading |
| #3591CB text on black | 6.06:1 | AA | Lc -39.9 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C6DDED
oklch(88.5% 0.033 238.2)
-
Step 300
300
#9FC6E4
oklch(80.9% 0.06 241.6)
-
Step 400
400
#67A8D7
oklch(70.7% 0.096 241.3)
-
Step 500
500 (this color)
#3591CB
oklch(62.9% 0.122 240.7)
-
Step 600
600
#007BB7
oklch(55.7% 0.129 240.7)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#0D4667
oklch(37.7% 0.079 240.3)
-
Step 950
950
#0B293D
oklch(27% 0.051 241.6)
#3591CB 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) | #7692CE | 0.062 |
| Deuteranopia (no green cones) | #6183CA | 0.050 |
| Tritanopia (no blue cones) | #009FA5 | 0.083 |
| Achromatopsia (no color) | #8A8A8A | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3591CB
#3591CB
oklch(62.9% 0.122 240.7)
- #BD7531
#BD7531
oklch(62.8% 0.122 60.5)
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 #3591CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.036
- Cool Blue #4984B8 ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.043
- Faded Blue #658CBB ΔE 0.045
- Blue NCS #118AB2 ΔE 0.046
- Steel Blue #4682B4 ΔE 0.048
- Off Blue #5684AE ΔE 0.052
- Dusty Blue #5A86AD ΔE 0.052
Use #3591CB 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.