#3789B0
Closest named color: Blue NCS (#118AB2). oklch(59.7% 0.098 232.5), rgb(55, 137, 176).
Aa
Black text reads best on this color (5.36:1).
About this color
#3789B0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.098 and its hue 232°. 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 5.36:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.36:1 |
| White text | 3.91:1 |
Values
| HEX | #3789B0 |
| RGB | rgb(55, 137, 176) |
| HSL | hsl(199, 52%, 45%) |
| OKLCH | oklch(59.7% 0.098 232.5) |
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 #3789B0 | 3.91:1 | AA large text | Lc -71.8 | Content text, not long reading |
| Black text on #3789B0 | 5.36:1 | AA | Lc 37.8 | Non-text elements, placeholder text |
| #3789B0 text on white | 3.91:1 | AA large text | Lc 66.3 | Content text, not long reading |
| #3789B0 text on black | 5.36:1 | AA | Lc -35.4 | 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
#C9DDE8
oklch(88.6% 0.026 231.7)
-
Step 300
300
#A2C7DB
oklch(80.9% 0.049 231.7)
-
Step 400
400
#6EA9C9
oklch(70.6% 0.077 233.1)
-
Step 500
500 (this color)
#3789B0
oklch(59.7% 0.098 232.5)
-
Step 600
600
#197DA7
oklch(55.6% 0.107 232.5)
-
Step 700
700
#05698F
oklch(49% 0.099 232.6)
-
Step 800
800
#0E5674
oklch(42.7% 0.082 232.3)
-
Step 900
900
#17475E
oklch(37.7% 0.064 233.1)
-
Step 950
950
#0F2A37
oklch(27.1% 0.041 231.9)
#3789B0 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) | #7687B2 | 0.065 |
| Deuteranopia (no green cones) | #657BAF | 0.056 |
| Tritanopia (no blue cones) | #009396 | 0.061 |
| Achromatopsia (no color) | #818181 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3789B0
#3789B0
oklch(59.7% 0.098 232.5)
- #AD6E45
#AD6E45
oklch(59.7% 0.098 52.9)
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 #3789B0, 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 0.025
- Cool Blue #4984B8 ΔE 0.025
- Off Blue #5684AE ΔE 0.028
- Dusty Blue #5A86AD ΔE 0.031
- Teal Blue #01889F ΔE 0.036
- Cerulean #457B9D ΔE 0.043
- Stormy Blue #507B9C ΔE 0.045
Use #3789B0 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.