#3783AA
Closest named color: Steel Blue (#4682B4). oklch(58% 0.095 234.2), rgb(55, 131, 170).
Aa
Black text reads best on this color (4.98:1).
About this color
#3783AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.095 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.022 away. Black text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.98:1 |
| White text | 4.20:1 |
Values
| HEX | #3783AA |
| RGB | rgb(55, 131, 170) |
| HSL | hsl(200, 51%, 44%) |
| OKLCH | oklch(58% 0.095 234.2) |
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 #3783AA | 4.20:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #3783AA | 4.98:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #3783AA text on white | 4.20:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #3783AA text on black | 4.98:1 | AA | Lc -32.9 | 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 600.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A6C6D9
oklch(80.9% 0.044 234.1)
-
Step 400
400
#75A8C5
oklch(70.6% 0.069 234)
-
Step 500
500
#4F92B7
oklch(63.1% 0.088 234.7)
-
Step 600
600 (this color)
#3783AA
oklch(58% 0.095 234.2)
-
Step 700
700
#21688B
oklch(49% 0.088 234.5)
-
Step 800
800
#1E5571
oklch(42.7% 0.073 234.5)
-
Step 900
900
#1F465B
oklch(37.6% 0.057 234.6)
-
Step 950
950
#132935
oklch(26.9% 0.036 234.1)
#3783AA 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) | #7082AC | 0.060 |
| Deuteranopia (no green cones) | #6076A9 | 0.051 |
| Tritanopia (no blue cones) | #008D90 | 0.062 |
| Achromatopsia (no color) | #7B7B7B | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3783AA
#3783AA
oklch(58% 0.095 234.2)
- #A66A41
#A66A41
oklch(58% 0.095 54)
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 #3783AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.022
- Blue NCS #118AB2 ΔE 0.024
- Cerulean #457B9D ΔE 0.027
- Cool Blue #4984B8 ΔE 0.028
- Off Blue #5684AE ΔE 0.030
- Stormy Blue #507B9C ΔE 0.031
- Teal Blue #01889F ΔE 0.033
- Dusty Blue #5A86AD ΔE 0.035
Use #3783AA 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.