#3680D3
Closest named color: Water Blue (#0E87CC). oklch(59.5% 0.147 253.6), rgb(54, 128, 211).
Aa
Black text reads best on this color (5.18:1).
About this color
#3680D3 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.147 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.028 away. Black text reads best on it, at 5.18:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.18:1 |
| White text | 4.05:1 |
Values
| HEX | #3680D3 |
| RGB | rgb(54, 128, 211) |
| HSL | hsl(212, 64%, 52%) |
| OKLCH | oklch(59.5% 0.147 253.6) |
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 #3680D3 | 4.05:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #3680D3 | 5.18:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #3680D3 text on white | 4.05:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #3680D3 text on black | 5.18:1 | AA | Lc -34.3 | 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 500.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C7DBF4
oklch(88.4% 0.041 254)
-
Step 300
300
#A1C4EF
oklch(81% 0.072 253.8)
-
Step 400
400
#6CA4E7
oklch(70.8% 0.115 253.7)
-
Step 500
500 (this color)
#3680D3
oklch(59.5% 0.147 253.6)
-
Step 600
600
#1D73CD
oklch(55.5% 0.16 253.8)
-
Step 700
700
#0C60B1
oklch(49% 0.148 253.6)
-
Step 800
800
#104F90
oklch(42.7% 0.123 253.7)
-
Step 900
900
#174273
oklch(37.7% 0.096 254.1)
-
Step 950
950
#0F2743
oklch(27% 0.06 253.9)
#3680D3 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) | #5986D6 | 0.038 |
| Deuteranopia (no green cones) | #4078D1 | 0.021 |
| Tritanopia (no blue cones) | #00949F | 0.113 |
| Achromatopsia (no color) | #7E7E7E | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3680D3
#3680D3
oklch(59.5% 0.147 253.6)
- #AB7100
#AB7100
oklch(59.5% 0.126 73.6)
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 #3680D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.028
- Windows Blue #3778BF ΔE 0.035
- Dark Sky Blue #448EE4 ΔE 0.046
- Cool Blue #4984B8 ΔE 0.048
- Steel Blue #4682B4 ΔE 0.051
- Nice Blue #107AB0 ΔE 0.061
- Soft Blue #6488EA ΔE 0.062
- Royal Blue #4169E1 ΔE 0.066
Use #3680D3 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.