#3990BC
Closest named color: Blue NCS (#118AB2). oklch(62% 0.105 234.3), rgb(57, 144, 188).
Aa
Black text reads best on this color (5.88:1).
About this color
#3990BC is a medium-light, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.105 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.031 away. Black text reads best on it, at 5.88:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.88:1 |
| White text | 3.56:1 |
Values
| HEX | #3990BC |
| RGB | rgb(57, 144, 188) |
| HSL | hsl(200, 53%, 48%) |
| OKLCH | oklch(62% 0.105 234.3) |
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 #3990BC | 3.56:1 | AA large text | Lc -68.4 | Content text, not long reading |
| Black text on #3990BC | 5.88:1 | AA | Lc 41.1 | Non-text elements, placeholder text |
| #3990BC text on white | 3.56:1 | AA large text | Lc 63.0 | Content text, not long reading |
| #3990BC text on black | 5.88:1 | AA | Lc -38.7 | 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
#C8DDEA
oklch(88.6% 0.029 234.9)
-
Step 300
300
#A1C7DD
oklch(80.9% 0.051 233.6)
-
Step 400
400
#6BA9CD
oklch(70.6% 0.083 235.1)
-
Step 500
500 (this color)
#3990BC
oklch(62% 0.105 234.3)
-
Step 600
600
#097DAC
oklch(55.6% 0.115 234.3)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#045678
oklch(42.8% 0.088 234.4)
-
Step 900
900
#134760
oklch(37.7% 0.068 234)
-
Step 950
950
#0D2A38
oklch(27% 0.043 232.5)
#3990BC 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) | #7B8FBE | 0.067 |
| Deuteranopia (no green cones) | #6982BB | 0.056 |
| Tritanopia (no blue cones) | #009C9F | 0.068 |
| Achromatopsia (no color) | #888888 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3990BC
#3990BC
oklch(62% 0.105 234.3)
- #B77445
#B77445
oklch(62.1% 0.105 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 #3990BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.031
- Cool Blue #4984B8 ΔE 0.034
- Dusty Blue #5A86AD ΔE 0.038
- Steel Blue #4682B4 ΔE 0.039
- Off Blue #5684AE ΔE 0.039
- Faded Blue #658CBB ΔE 0.040
- Water Blue #0E87CC ΔE 0.045
- Teal Blue #01889F ΔE 0.055
Use #3990BC 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.