#3591BC
Closest named color: Blue NCS (#118AB2). oklch(62.1% 0.107 232.6), rgb(53, 145, 188).
Aa
Black text reads best on this color (5.92:1).
About this color
#3591BC is a medium-light, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.107 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.031 away. Black text reads best on it, at 5.92:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.92:1 |
| White text | 3.54:1 |
Values
| HEX | #3591BC |
| RGB | rgb(53, 145, 188) |
| HSL | hsl(199, 56%, 47%) |
| OKLCH | oklch(62.1% 0.107 232.6) |
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 #3591BC | 3.54:1 | AA large text | Lc -68.2 | Content text, not long reading |
| Black text on #3591BC | 5.92:1 | AA | Lc 41.4 | Non-text elements, placeholder text |
| #3591BC text on white | 3.54:1 | AA large text | Lc 62.7 | Content text, not long reading |
| #3591BC text on black | 5.92:1 | AA | Lc -39.0 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF2
oklch(93.6% 0.015 229)
-
Step 200
200
#C7DDE9
oklch(88.5% 0.029 231.5)
-
Step 300
300
#A0C7DD
oklch(80.9% 0.052 233)
-
Step 400
400
#69AACC
oklch(70.7% 0.083 232.5)
-
Step 500
500 (this color)
#3591BC
oklch(62.1% 0.107 232.6)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#0F4760
oklch(37.6% 0.07 232.9)
-
Step 950
950
#0C2A38
oklch(27% 0.044 231.9)
#3591BC 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) | #7C8FBE | 0.070 |
| Deuteranopia (no green cones) | #6982BB | 0.059 |
| Tritanopia (no blue cones) | #009D9F | 0.067 |
| Achromatopsia (no color) | #888888 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3591BC
#3591BC
oklch(62.1% 0.107 232.6)
- #B97346
#B97346
oklch(62.2% 0.107 52.3)
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 #3591BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.031
- Cool Blue #4984B8 ΔE 0.037
- Dusty Blue #5A86AD ΔE 0.041
- Steel Blue #4682B4 ΔE 0.041
- Off Blue #5684AE ΔE 0.042
- Faded Blue #658CBB ΔE 0.042
- Water Blue #0E87CC ΔE 0.046
- Teal Blue #01889F ΔE 0.055
Use #3591BC 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.