#2180D0
Closest named color: Water Blue (#0E87CC). oklch(58.7% 0.149 249.4), rgb(33, 128, 208).
Aa
Black text reads best on this color (5.06:1).
About this color
#2180D0 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.149 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.022 away. Black text reads best on it, at 5.06:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.06:1 |
| White text | 4.14:1 |
Values
| HEX | #2180D0 |
| RGB | rgb(33, 128, 208) |
| HSL | hsl(207, 73%, 47%) |
| OKLCH | oklch(58.7% 0.149 249.4) |
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 #2180D0 | 4.14:1 | AA large text | Lc -73.6 | Content text, not long reading |
| Black text on #2180D0 | 5.06:1 | AA | Lc 36.0 | Non-text elements, placeholder text |
| #2180D0 text on white | 4.14:1 | AA large text | Lc 68.1 | Content text, not long reading |
| #2180D0 text on black | 5.06:1 | AA | Lc -33.6 | 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
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF1
oklch(88.5% 0.037 248.2)
-
Step 300
300
#A0C5EB
oklch(81% 0.067 249.3)
-
Step 400
400
#6AA6E1
oklch(70.8% 0.107 249.2)
-
Step 500
500
#3D8ED8
oklch(63.1% 0.137 249.2)
-
Step 600
600 (this color)
#2180D0
oklch(58.7% 0.149 249.4)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#08518A
oklch(42.7% 0.114 249.4)
-
Step 900
900
#13446F
oklch(37.8% 0.09 249.2)
-
Step 950
950
#0D2841
oklch(27% 0.057 249.3)
#2180D0 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) | #5985D3 | 0.048 |
| Deuteranopia (no green cones) | #3E75CE | 0.032 |
| Tritanopia (no blue cones) | #00939E | 0.107 |
| Achromatopsia (no color) | #7C7C7C | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2180D0
#2180D0
oklch(58.7% 0.149 249.4)
- #AC6C00
#AC6C00
oklch(58.7% 0.128 69.4)
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 #2180D0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.022
- Windows Blue #3778BF ΔE 0.031
- Cool Blue #4984B8 ΔE 0.049
- Steel Blue #4682B4 ΔE 0.050
- Nice Blue #107AB0 ΔE 0.052
- Dark Sky Blue #448EE4 ΔE 0.054
- Blue NCS #118AB2 ΔE 0.061
- Flat Blue #3C73A8 ΔE 0.065
Use #2180D0 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.