#2780CB
Closest named color: Water Blue (#0E87CC). oklch(58.6% 0.141 248.7), rgb(39, 128, 203).
Aa
Black text reads best on this color (5.03:1).
About this color
#2780CB is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.141 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.020 away. Black text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.03:1 |
| White text | 4.16:1 |
Values
| HEX | #2780CB |
| RGB | rgb(39, 128, 203) |
| HSL | hsl(207, 68%, 47%) |
| OKLCH | oklch(58.6% 0.141 248.7) |
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 #2780CB | 4.16:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #2780CB | 5.03:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #2780CB text on white | 4.16:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #2780CB text on black | 5.03:1 | AA | Lc -33.4 | 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 600.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCF0
oklch(88.6% 0.035 248.2)
-
Step 300
300
#A1C5E8
oklch(80.9% 0.063 247.9)
-
Step 400
400
#6DA6DD
oklch(70.8% 0.101 248.6)
-
Step 500
500
#428ED4
oklch(63.1% 0.13 249)
-
Step 600
600 (this color)
#2780CB
oklch(58.6% 0.141 248.7)
-
Step 700
700
#0864A7
oklch(49.2% 0.131 248.6)
-
Step 800
800
#0F5287
oklch(42.8% 0.108 248.4)
-
Step 900
900
#16446C
oklch(37.7% 0.085 248.5)
-
Step 950
950
#0F283F
oklch(27% 0.053 248.7)
#2780CB 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) | #5C84CE | 0.048 |
| Deuteranopia (no green cones) | #4475CA | 0.033 |
| Tritanopia (no blue cones) | #00929C | 0.102 |
| Achromatopsia (no color) | #7C7C7C | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2780CB
#2780CB
oklch(58.6% 0.141 248.7)
- #AC6B00
#AC6B00
oklch(58.5% 0.128 68.6)
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 #2780CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.020
- Windows Blue #3778BF ΔE 0.026
- Cool Blue #4984B8 ΔE 0.041
- Steel Blue #4682B4 ΔE 0.042
- Nice Blue #107AB0 ΔE 0.046
- Blue NCS #118AB2 ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.058
Use #2780CB 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.