#2180DA
Closest named color: Water Blue (#0E87CC). oklch(59.4% 0.161 251.9), rgb(33, 128, 218).
Aa
Black text reads best on this color (5.16:1).
About this color
#2180DA is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.161 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.032 away. Black text reads best on it, at 5.16:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.161) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.16:1 |
| White text | 4.06:1 |
Values
| HEX | #2180DA |
| RGB | rgb(33, 128, 218) |
| HSL | hsl(209, 74%, 49%) |
| OKLCH | oklch(59.4% 0.161 251.9) |
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 #2180DA | 4.06:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #2180DA | 5.16:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #2180DA text on white | 4.06:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #2180DA text on black | 5.16:1 | AA | Lc -34.3 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF6
oklch(88.6% 0.044 251.5)
-
Step 300
300
#9CC5F3
oklch(81% 0.079 251.7)
-
Step 400
400
#63A5ED
oklch(70.8% 0.126 251.9)
-
Step 500
500 (this color)
#2180DA
oklch(59.4% 0.161 251.9)
-
Step 600
600
#0074D0
oklch(55.6% 0.166 251.9)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#004F92
oklch(42.6% 0.129 252.3)
-
Step 900
900
#094277
oklch(37.6% 0.106 252.2)
-
Step 950
950
#092746
oklch(26.9% 0.068 252.4)
#2180DA 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) | #5387DE | 0.045 |
| Deuteranopia (no green cones) | #3276D8 | 0.026 |
| Tritanopia (no blue cones) | #0096A2 | 0.120 |
| Achromatopsia (no color) | #7E7E7E | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2180DA
#2180DA
oklch(59.4% 0.161 251.9)
- #AC7000
#AC7000
oklch(59.4% 0.127 72.3)
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 #2180DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.032
- Windows Blue #3778BF ΔE 0.043
- Dark Sky Blue #448EE4 ΔE 0.049
- Clear Blue #247AFD ΔE 0.057
- Cerulean Blue #056EEE ΔE 0.060
- Cool Blue #4984B8 ΔE 0.061
- Royal Blue #4169E1 ΔE 0.062
- Steel Blue #4682B4 ΔE 0.063
Use #2180DA 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.