#3684DB
Closest named color: Water Blue (#0E87CC). oklch(60.8% 0.153 253.6), rgb(54, 132, 219).
Aa
Black text reads best on this color (5.48:1).
About this color
#3684DB is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.153 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.032 away. Black text reads best on it, at 5.48:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.48:1 |
| White text | 3.83:1 |
Values
| HEX | #3684DB |
| RGB | rgb(54, 132, 219) |
| HSL | hsl(212, 70%, 54%) |
| OKLCH | oklch(60.8% 0.153 253.6) |
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 #3684DB | 3.83:1 | AA large text | Lc -70.9 | Content text, not long reading |
| Black text on #3684DB | 5.48:1 | AA | Lc 38.6 | Non-text elements, placeholder text |
| #3684DB text on white | 3.83:1 | AA large text | Lc 65.4 | Content text, not long reading |
| #3684DB text on black | 5.48:1 | AA | Lc -36.2 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#9FC4F0
oklch(80.9% 0.074 253.1)
-
Step 400
400
#69A4E9
oklch(70.7% 0.119 253.2)
-
Step 500
500 (this color)
#3684DB
oklch(60.8% 0.153 253.6)
-
Step 600
600
#1473D1
oklch(55.6% 0.166 253.7)
-
Step 700
700
#0160B5
oklch(49.2% 0.154 253.7)
-
Step 800
800
#0A4F92
oklch(42.8% 0.127 253.4)
-
Step 900
900
#144275
oklch(37.7% 0.1 253.9)
-
Step 950
950
#0D2744
oklch(27% 0.063 253.3)
#3684DB 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) | #5A8ADE | 0.038 |
| Deuteranopia (no green cones) | #407BD9 | 0.024 |
| Tritanopia (no blue cones) | #0099A5 | 0.116 |
| Achromatopsia (no color) | #828282 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3684DB
#3684DB
oklch(60.8% 0.153 253.6)
- #B07500
#B07500
oklch(60.9% 0.129 74)
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 #3684DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.032
- Dark Sky Blue #448EE4 ΔE 0.032
- Windows Blue #3778BF ΔE 0.050
- Soft Blue #6488EA ΔE 0.052
- Cool Blue #4984B8 ΔE 0.055
- Chefchaouen Blue #4895EF ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.058
- Steel Blue #4682B4 ΔE 0.059
Use #3684DB 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.