#3581BF
Closest named color: Steel Blue (#4682B4). oklch(58.5% 0.121 246.6), rgb(53, 129, 191).
Aa
Black text reads best on this color (5.04:1).
About this color
#3581BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.121 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.022 away. Black text reads best on it, at 5.04:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 5.04:1 |
| White text | 4.16:1 |
Values
| HEX | #3581BF |
| RGB | rgb(53, 129, 191) |
| HSL | hsl(207, 57%, 48%) |
| OKLCH | oklch(58.5% 0.121 246.6) |
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 #3581BF | 4.16:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #3581BF | 5.04:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #3581BF text on white | 4.16:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #3581BF text on black | 5.04:1 | AA | Lc -33.3 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADCEC
oklch(88.6% 0.029 244.9)
-
Step 300
300
#A5C5E2
oklch(81% 0.054 245.9)
-
Step 400
400
#73A6D4
oklch(70.7% 0.087 246.6)
-
Step 500
500
#4C8FC9
oklch(63.1% 0.111 246.8)
-
Step 600
600 (this color)
#3581BF
oklch(58.5% 0.121 246.6)
-
Step 700
700
#1D659C
oklch(49.1% 0.112 246.4)
-
Step 800
800
#1B527F
oklch(42.6% 0.094 247.2)
-
Step 900
900
#1D4566
oklch(37.8% 0.072 246.2)
-
Step 950
950
#12283C
oklch(26.9% 0.047 247.8)
#3581BF 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) | #6583C2 | 0.048 |
| Deuteranopia (no green cones) | #5176BE | 0.036 |
| Tritanopia (no blue cones) | #009097 | 0.089 |
| Achromatopsia (no color) | #7C7C7C | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3581BF
#3581BF
oklch(58.5% 0.121 246.6)
- #AB6B19
#AB6B19
oklch(58.4% 0.121 66.3)
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 #3581BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.022
- Cool Blue #4984B8 ΔE 0.023
- Windows Blue #3778BF ΔE 0.025
- Water Blue #0E87CC ΔE 0.025
- Nice Blue #107AB0 ΔE 0.037
- Blue NCS #118AB2 ΔE 0.039
- Off Blue #5684AE ΔE 0.041
- Flat Blue #3C73A8 ΔE 0.047
Use #3581BF 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.