#3684E2
Closest named color: Dark Sky Blue (#448EE4). oklch(61.3% 0.161 255.1), rgb(54, 132, 226).
Aa
Black text reads best on this color (5.55:1).
About this color
#3684E2 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.161 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.031 away. Black text reads best on it, at 5.55:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.161) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.55:1 |
| White text | 3.77:1 |
Values
| HEX | #3684E2 |
| RGB | rgb(54, 132, 226) |
| HSL | hsl(213, 75%, 55%) |
| OKLCH | oklch(61.3% 0.161 255.1) |
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 #3684E2 | 3.77:1 | AA large text | Lc -70.4 | Content text, not long reading |
| Black text on #3684E2 | 5.55:1 | AA | Lc 39.2 | Non-text elements, placeholder text |
| #3684E2 text on white | 3.77:1 | AA large text | Lc 64.9 | Content text, not long reading |
| #3684E2 text on black | 5.55:1 | AA | Lc -36.7 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF6
oklch(88.4% 0.044 254.8)
-
Step 300
300
#9FC4F3
oklch(81% 0.078 254.6)
-
Step 400
400
#68A3EE
oklch(70.7% 0.127 255.1)
-
Step 500
500 (this color)
#3684E2
oklch(61.3% 0.161 255.1)
-
Step 600
600
#1271D6
oklch(55.5% 0.175 255.2)
-
Step 700
700
#005EBA
oklch(49.1% 0.163 255.3)
-
Step 800
800
#084D96
oklch(42.6% 0.135 255.2)
-
Step 900
900
#134178
oklch(37.7% 0.106 255.4)
-
Step 950
950
#0D2746
oklch(27.1% 0.066 254.6)
#3684E2 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) | #568CE6 | 0.038 |
| Deuteranopia (no green cones) | #377CE0 | 0.021 |
| Tritanopia (no blue cones) | #009AA8 | 0.123 |
| Achromatopsia (no color) | #838383 | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3684E2
#3684E2
oklch(61.3% 0.161 255.1)
- #B07700
#B07700
oklch(61.3% 0.129 75.5)
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 #3684E2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.031
- Water Blue #0E87CC ΔE 0.041
- Soft Blue #6488EA ΔE 0.047
- Dodger Blue #1E90FF ΔE 0.049
- Chefchaouen Blue #4895EF ΔE 0.051
- Clear Blue #247AFD ΔE 0.052
- Windows Blue #3778BF ΔE 0.058
- Cool Blue #4984B8 ΔE 0.065
Use #3684E2 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.