#3783DB
Closest named color: Water Blue (#0E87CC). oklch(60.6% 0.153 254.3), rgb(55, 131, 219).
Aa
Black text reads best on this color (5.43:1).
About this color
#3783DB is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.153 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.033 away. Black text reads best on it, at 5.43:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.43:1 |
| White text | 3.86:1 |
Values
| HEX | #3783DB |
| RGB | rgb(55, 131, 219) |
| HSL | hsl(212, 69%, 54%) |
| OKLCH | oklch(60.6% 0.153 254.3) |
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 #3783DB | 3.86:1 | AA large text | Lc -71.2 | Content text, not long reading |
| Black text on #3783DB | 5.43:1 | AA | Lc 38.3 | Non-text elements, placeholder text |
| #3783DB text on white | 3.86:1 | AA large text | Lc 65.7 | Content text, not long reading |
| #3783DB text on black | 5.43:1 | AA | Lc -35.9 | 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 500.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A0C4F1
oklch(81% 0.075 254.2)
-
Step 400
400
#6AA3EA
oklch(70.6% 0.121 254.6)
-
Step 500
500 (this color)
#3783DB
oklch(60.6% 0.153 254.3)
-
Step 600
600
#1872D1
oklch(55.5% 0.167 254.5)
-
Step 700
700
#055FB5
oklch(49% 0.155 254.4)
-
Step 800
800
#0D4E93
oklch(42.6% 0.129 254.6)
-
Step 900
900
#154275
oklch(37.8% 0.1 254.2)
-
Step 950
950
#0E2744
oklch(27% 0.062 253.9)
#3783DB 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) | #598ADE | 0.038 |
| Deuteranopia (no green cones) | #3E7BD9 | 0.021 |
| Tritanopia (no blue cones) | #0098A4 | 0.118 |
| Achromatopsia (no color) | #828282 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3783DB
#3783DB
oklch(60.6% 0.153 254.3)
- #AF7500
#AF7500
oklch(60.8% 0.128 74.5)
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 #3783DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.033
- Dark Sky Blue #448EE4 ΔE 0.034
- Windows Blue #3778BF ΔE 0.048
- Soft Blue #6488EA ΔE 0.052
- Cool Blue #4984B8 ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.059
- Steel Blue #4682B4 ΔE 0.060
Use #3783DB 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.