#3581AE
Closest named color: Steel Blue (#4682B4). oklch(57.6% 0.101 238.2), rgb(53, 129, 174).
Aa
Black text reads best on this color (4.90:1).
About this color
#3581AE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.101 and its hue 238°. 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 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.90:1 |
| White text | 4.28:1 |
Values
| HEX | #3581AE |
| RGB | rgb(53, 129, 174) |
| HSL | hsl(202, 53%, 45%) |
| OKLCH | oklch(57.6% 0.101 238.2) |
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 #3581AE | 4.28:1 | AA large text | Lc -74.8 | Content text, not long reading |
| Black text on #3581AE | 4.90:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #3581AE text on white | 4.28:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #3581AE text on black | 4.90:1 | AA | Lc -32.3 | 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 600.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A6C6DB
oklch(81% 0.045 236.9)
-
Step 400
400
#75A8C9
oklch(70.8% 0.073 237.5)
-
Step 500
500
#4E91BB
oklch(63% 0.093 238.2)
-
Step 600
600 (this color)
#3581AE
oklch(57.6% 0.101 238.2)
-
Step 700
700
#206790
oklch(49% 0.095 238.8)
-
Step 800
800
#1D5475
oklch(42.6% 0.079 239.1)
-
Step 900
900
#1E465E
oklch(37.7% 0.061 237.7)
-
Step 950
950
#132937
oklch(27% 0.038 238.3)
#3581AE 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) | #6C81B0 | 0.057 |
| Deuteranopia (no green cones) | #5B75AD | 0.046 |
| Tritanopia (no blue cones) | #008C90 | 0.069 |
| Achromatopsia (no color) | #7A7A7A | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3581AE
#3581AE
oklch(57.6% 0.101 238.2)
- #A56937
#A56937
oklch(57.6% 0.101 58.5)
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 #3581AE, 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 0.025
- Blue NCS #118AB2 ΔE 0.027
- Cerulean #457B9D ΔE 0.028
- Nice Blue #107AB0 ΔE 0.031
- Off Blue #5684AE ΔE 0.032
- Stormy Blue #507B9C ΔE 0.034
- Dusty Blue #5A86AD ΔE 0.039
Use #3581AE 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.