#3689B3
Closest named color: Blue NCS (#118AB2). oklch(59.8% 0.102 234.3), rgb(54, 137, 179).
Aa
Black text reads best on this color (5.38:1).
About this color
#3689B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.102 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.017 away. Black text reads best on it, at 5.38:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.38:1 |
| White text | 3.89:1 |
Values
| HEX | #3689B3 |
| RGB | rgb(54, 137, 179) |
| HSL | hsl(200, 54%, 46%) |
| OKLCH | oklch(59.8% 0.102 234.3) |
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 #3689B3 | 3.89:1 | AA large text | Lc -71.6 | Content text, not long reading |
| Black text on #3689B3 | 5.38:1 | AA | Lc 37.9 | Non-text elements, placeholder text |
| #3689B3 text on white | 3.89:1 | AA large text | Lc 66.1 | Content text, not long reading |
| #3689B3 text on black | 5.38:1 | AA | Lc -35.5 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDE9
oklch(88.6% 0.028 232.7)
-
Step 300
300
#A2C7DC
oklch(81% 0.049 233.1)
-
Step 400
400
#6DA9CB
oklch(70.7% 0.08 234.4)
-
Step 500
500 (this color)
#3689B3
oklch(59.8% 0.102 234.3)
-
Step 600
600
#167DAA
oklch(55.7% 0.11 234.1)
-
Step 700
700
#016992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#0C5676
oklch(42.8% 0.084 233.8)
-
Step 900
900
#16475F
oklch(37.7% 0.066 233.8)
-
Step 950
950
#0F2A38
oklch(27.1% 0.042 233.9)
#3689B3 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) | #7588B5 | 0.064 |
| Deuteranopia (no green cones) | #637CB2 | 0.052 |
| Tritanopia (no blue cones) | #009497 | 0.065 |
| Achromatopsia (no color) | #818181 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3689B3
#3689B3
oklch(59.8% 0.102 234.3)
- #AE6E41
#AE6E41
oklch(59.8% 0.101 54.5)
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 #3689B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.017
- Steel Blue #4682B4 ΔE 0.023
- Cool Blue #4984B8 ΔE 0.023
- Off Blue #5684AE ΔE 0.028
- Dusty Blue #5A86AD ΔE 0.031
- Teal Blue #01889F ΔE 0.040
- Water Blue #0E87CC ΔE 0.043
- Cerulean #457B9D ΔE 0.045
Use #3689B3 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.