#3791BD
Closest named color: Blue NCS (#118AB2). oklch(62.2% 0.107 233.6), rgb(55, 145, 189).
Aa
Black text reads best on this color (5.94:1).
About this color
#3791BD is a medium-light, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.107 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.032 away. Black text reads best on it, at 5.94:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.94:1 |
| White text | 3.53:1 |
Values
| HEX | #3791BD |
| RGB | rgb(55, 145, 189) |
| HSL | hsl(200, 55%, 48%) |
| OKLCH | oklch(62.2% 0.107 233.6) |
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 #3791BD | 3.53:1 | AA large text | Lc -68.1 | Content text, not long reading |
| Black text on #3791BD | 5.94:1 | AA | Lc 41.5 | Non-text elements, placeholder text |
| #3791BD text on white | 3.53:1 | AA large text | Lc 62.6 | Content text, not long reading |
| #3791BD text on black | 5.94:1 | AA | Lc -39.1 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C7DDEA
oklch(88.5% 0.03 233.6)
-
Step 300
300
#A0C7DD
oklch(80.9% 0.052 233)
-
Step 400
400
#69AACD
oklch(70.8% 0.084 233.2)
-
Step 500
500 (this color)
#3791BD
oklch(62.2% 0.107 233.6)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#114761
oklch(37.7% 0.07 234.5)
-
Step 950
950
#0C2A39
oklch(27% 0.045 233.7)
#3791BD 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) | #7B90BF | 0.067 |
| Deuteranopia (no green cones) | #6983BC | 0.056 |
| Tritanopia (no blue cones) | #009DA0 | 0.068 |
| Achromatopsia (no color) | #888888 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3791BD
#3791BD
oklch(62.2% 0.107 233.6)
- #B97445
#B97445
oklch(62.3% 0.107 53.7)
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 #3791BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.032
- Cool Blue #4984B8 ΔE 0.036
- Dusty Blue #5A86AD ΔE 0.040
- Faded Blue #658CBB ΔE 0.041
- Steel Blue #4682B4 ΔE 0.041
- Off Blue #5684AE ΔE 0.042
- Water Blue #0E87CC ΔE 0.046
- Teal Blue #01889F ΔE 0.057
Use #3791BD 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.