#3584BF
Closest named color: Cool Blue (#4984B8). oklch(59.2% 0.118 244.5), rgb(53, 132, 191).
Aa
Black text reads best on this color (5.20:1).
About this color
#3584BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.118 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.018 away. Black text reads best on it, at 5.20:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.20:1 |
| White text | 4.03:1 |
Values
| HEX | #3584BF |
| RGB | rgb(53, 132, 191) |
| HSL | hsl(206, 57%, 48%) |
| OKLCH | oklch(59.2% 0.118 244.5) |
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 #3584BF | 4.03:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #3584BF | 5.20:1 | AA | Lc 36.8 | Non-text elements, placeholder text |
| #3584BF text on white | 4.03:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #3584BF text on black | 5.20:1 | AA | Lc -34.4 | 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
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A4C5E1
oklch(80.9% 0.053 244.1)
-
Step 400
400
#72A7D2
oklch(70.8% 0.085 243.9)
-
Step 500
500
#4A90C7
oklch(63.2% 0.109 244.5)
-
Step 600
600 (this color)
#3584BF
oklch(59.2% 0.118 244.5)
-
Step 700
700
#1A669A
oklch(49.2% 0.109 244.2)
-
Step 800
800
#19537D
oklch(42.7% 0.091 244.6)
-
Step 900
900
#1C4565
oklch(37.7% 0.072 245)
-
Step 950
950
#11293B
oklch(27.1% 0.045 243.2)
#3584BF 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) | #6986C2 | 0.052 |
| Deuteranopia (no green cones) | #5679BE | 0.039 |
| Tritanopia (no blue cones) | #009299 | 0.084 |
| Achromatopsia (no color) | #7E7E7E | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3584BF
#3584BF
oklch(59.2% 0.118 244.5)
- #AE6D23
#AE6D23
oklch(59.3% 0.119 64.5)
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 #3584BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.018
- Steel Blue #4682B4 ΔE 0.020
- Water Blue #0E87CC ΔE 0.023
- Blue NCS #118AB2 ΔE 0.034
- Windows Blue #3778BF ΔE 0.034
- Off Blue #5684AE ΔE 0.037
- Nice Blue #107AB0 ΔE 0.042
- Dusty Blue #5A86AD ΔE 0.043
Use #3584BF 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.