#3685BC
Closest named color: Cool Blue (#4984B8). oklch(59.3% 0.114 242.6), rgb(54, 133, 188).
Aa
Black text reads best on this color (5.23:1).
About this color
#3685BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.114 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.015 away. Black text reads best on it, at 5.23:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.23:1 |
| White text | 4.00:1 |
Values
| HEX | #3685BC |
| RGB | rgb(54, 133, 188) |
| HSL | hsl(205, 55%, 47%) |
| OKLCH | oklch(59.3% 0.114 242.6) |
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 #3685BC | 4.00:1 | AA large text | Lc -72.6 | Content text, not long reading |
| Black text on #3685BC | 5.23:1 | AA | Lc 37.0 | Non-text elements, placeholder text |
| #3685BC text on white | 4.00:1 | AA large text | Lc 67.1 | Content text, not long reading |
| #3685BC text on black | 5.23:1 | AA | Lc -34.6 | 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
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEB
oklch(88.6% 0.028 243.1)
-
Step 300
300
#A5C5E0
oklch(80.9% 0.052 243.9)
-
Step 400
400
#72A7D0
oklch(70.7% 0.082 242.6)
-
Step 500
500
#4B90C3
oklch(63% 0.104 242.8)
-
Step 600
600 (this color)
#3685BC
oklch(59.3% 0.114 242.6)
-
Step 700
700
#1A6697
oklch(49% 0.106 242.6)
-
Step 800
800
#19547B
oklch(42.8% 0.088 242.3)
-
Step 900
900
#1C4563
oklch(37.6% 0.069 243.3)
-
Step 950
950
#12293A
oklch(27.1% 0.043 242.6)
#3685BC 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) | #6C86BE | 0.054 |
| Deuteranopia (no green cones) | #5979BB | 0.043 |
| Tritanopia (no blue cones) | #009398 | 0.081 |
| Achromatopsia (no color) | #7F7F7F | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3685BC
#3685BC
oklch(59.3% 0.114 242.6)
- #AD6D2C
#AD6D2C
oklch(59.2% 0.113 62.5)
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 #3685BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.015
- Steel Blue #4682B4 ΔE 0.016
- Water Blue #0E87CC ΔE 0.027
- Blue NCS #118AB2 ΔE 0.029
- Off Blue #5684AE ΔE 0.033
- Windows Blue #3778BF ΔE 0.038
- Dusty Blue #5A86AD ΔE 0.039
- Nice Blue #107AB0 ΔE 0.042
Use #3685BC 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.