#3690B8
Closest named color: Blue NCS (#118AB2). oklch(61.7% 0.103 231.1), rgb(54, 144, 184).
Aa
Black text reads best on this color (5.83:1).
About this color
#3690B8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.103 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.027 away. Black text reads best on it, at 5.83:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.83:1 |
| White text | 3.59:1 |
Values
| HEX | #3690B8 |
| RGB | rgb(54, 144, 184) |
| HSL | hsl(198, 55%, 47%) |
| OKLCH | oklch(61.7% 0.103 231.1) |
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 #3690B8 | 3.59:1 | AA large text | Lc -68.7 | Content text, not long reading |
| Black text on #3690B8 | 5.83:1 | AA | Lc 40.8 | Non-text elements, placeholder text |
| #3690B8 text on white | 3.59:1 | AA large text | Lc 63.3 | Content text, not long reading |
| #3690B8 text on black | 5.83:1 | AA | Lc -38.4 | 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
#C7DDE9
oklch(88.5% 0.029 231.5)
-
Step 300
300
#A0C7DC
oklch(80.8% 0.051 231.7)
-
Step 400
400
#6AAACA
oklch(70.7% 0.081 231.2)
-
Step 500
500 (this color)
#3690B8
oklch(61.7% 0.103 231.1)
-
Step 600
600
#017EA9
oklch(55.6% 0.112 231.3)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#11485F
oklch(37.8% 0.067 230.8)
-
Step 950
950
#0D2A37
oklch(27% 0.042 230.5)
#3690B8 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) | #7C8EBA | 0.070 |
| Deuteranopia (no green cones) | #6A81B7 | 0.060 |
| Tritanopia (no blue cones) | #009B9D | 0.063 |
| Achromatopsia (no color) | #878787 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3690B8
#3690B8
oklch(61.7% 0.103 231.1)
- #B67249
#B67249
oklch(61.6% 0.103 51)
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 #3690B8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.027
- Cool Blue #4984B8 ΔE 0.035
- Dusty Blue #5A86AD ΔE 0.038
- Off Blue #5684AE ΔE 0.039
- Steel Blue #4682B4 ΔE 0.039
- Faded Blue #658CBB ΔE 0.043
- Water Blue #0E87CC ΔE 0.049
- Teal Blue #01889F ΔE 0.049
Use #3690B8 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.