#3587B5
Closest named color: Steel Blue (#4682B4). oklch(59.4% 0.105 237.1), rgb(53, 135, 181).
Aa
Black text reads best on this color (5.28:1).
About this color
#3587B5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.105 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.018 away. Black text reads best on it, at 5.28:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 5.28:1 |
| White text | 3.97:1 |
Values
| HEX | #3587B5 |
| RGB | rgb(53, 135, 181) |
| HSL | hsl(202, 55%, 46%) |
| OKLCH | oklch(59.4% 0.105 237.1) |
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 #3587B5 | 3.97:1 | AA large text | Lc -72.3 | Content text, not long reading |
| Black text on #3587B5 | 5.28:1 | AA | Lc 37.3 | Non-text elements, placeholder text |
| #3587B5 text on white | 3.97:1 | AA large text | Lc 66.8 | Content text, not long reading |
| #3587B5 text on black | 5.28:1 | AA | Lc -34.9 | 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
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C8DCEA
oklch(88.4% 0.029 238.3)
-
Step 300
300
#A2C6DE
oklch(80.8% 0.051 237.5)
-
Step 400
400
#6DA9CE
oklch(70.8% 0.083 236.7)
-
Step 500
500 (this color)
#3587B5
oklch(59.4% 0.105 237.1)
-
Step 600
600
#187CAD
oklch(55.6% 0.114 236.8)
-
Step 700
700
#036895
oklch(49% 0.107 237.2)
-
Step 800
800
#0D5579
oklch(42.7% 0.088 237.4)
-
Step 900
900
#164661
oklch(37.6% 0.069 237.5)
-
Step 950
950
#0F2939
oklch(26.9% 0.044 238.4)
#3587B5 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) | #7187B7 | 0.061 |
| Deuteranopia (no green cones) | #607AB4 | 0.051 |
| Tritanopia (no blue cones) | #009397 | 0.070 |
| Achromatopsia (no color) | #808080 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3587B5
#3587B5
oklch(59.4% 0.105 237.1)
- #AD6D3A
#AD6D3A
oklch(59.4% 0.105 57.3)
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 #3587B5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.018
- Cool Blue #4984B8 ΔE 0.018
- Blue NCS #118AB2 ΔE 0.019
- Off Blue #5684AE ΔE 0.029
- Dusty Blue #5A86AD ΔE 0.033
- Water Blue #0E87CC ΔE 0.038
- Teal Blue #01889F ΔE 0.043
- Cerulean #457B9D ΔE 0.044
Use #3587B5 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.