#3689DC
Closest named color: Dark Sky Blue (#448EE4). oklch(62% 0.149 251.5), rgb(54, 137, 220).
Aa
Black text reads best on this color (5.76:1).
About this color
#3689DC is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.149 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.021 away. Black text reads best on it, at 5.76:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.76:1 |
| White text | 3.64:1 |
Values
| HEX | #3689DC |
| RGB | rgb(54, 137, 220) |
| HSL | hsl(210, 70%, 54%) |
| OKLCH | oklch(62% 0.149 251.5) |
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 #3689DC | 3.64:1 | AA large text | Lc -69.1 | Content text, not long reading |
| Black text on #3689DC | 5.76:1 | AA | Lc 40.5 | Non-text elements, placeholder text |
| #3689DC text on white | 3.64:1 | AA large text | Lc 63.6 | Content text, not long reading |
| #3689DC text on black | 5.76:1 | AA | Lc -38.1 | 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
#C6DCF4
oklch(88.6% 0.041 250.6)
-
Step 300
300
#9EC4EF
oklch(80.8% 0.074 251.8)
-
Step 400
400
#68A5E7
oklch(70.8% 0.116 251.5)
-
Step 500
500 (this color)
#3689DC
oklch(62% 0.149 251.5)
-
Step 600
600
#0775CD
oklch(55.7% 0.16 251.2)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800
#035090
oklch(42.8% 0.124 251.5)
-
Step 900
900
#114373
oklch(37.8% 0.097 251.5)
-
Step 950
950
#0C2743
oklch(26.8% 0.062 251.9)
#3689DC 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) | #628EDF | 0.044 |
| Deuteranopia (no green cones) | #487FDA | 0.028 |
| Tritanopia (no blue cones) | #009DA8 | 0.112 |
| Achromatopsia (no color) | #868686 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3689DC
#3689DC
oklch(62% 0.149 251.5)
- #B77600
#B77600
oklch(62% 0.133 71.3)
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 #3689DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.021
- Water Blue #0E87CC ΔE 0.032
- Chefchaouen Blue #4895EF ΔE 0.044
- Soft Blue #6488EA ΔE 0.048
- Dodger Blue #1E90FF ΔE 0.052
- Cool Blue #4984B8 ΔE 0.054
- Windows Blue #3778BF ΔE 0.059
- Steel Blue #4682B4 ΔE 0.060
Use #3689DC 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.