#2180C2
Closest named color: Water Blue (#0E87CC). oklch(57.9% 0.132 244.8), rgb(33, 128, 194).
Aa
Black text reads best on this color (4.93:1).
About this color
#2180C2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.132 and its hue 245°. 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 4.93:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 4.93:1 |
| White text | 4.25:1 |
Values
| HEX | #2180C2 |
| RGB | rgb(33, 128, 194) |
| HSL | hsl(205, 71%, 45%) |
| OKLCH | oklch(57.9% 0.132 244.8) |
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 #2180C2 | 4.25:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #2180C2 | 4.93:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #2180C2 text on white | 4.25:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #2180C2 text on black | 4.93:1 | AA | Lc -32.7 | 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
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEE
oklch(88.5% 0.033 245.3)
-
Step 300
300
#A1C5E5
oklch(80.8% 0.06 245.5)
-
Step 400
400
#6CA7D8
oklch(70.7% 0.095 244.8)
-
Step 500
500
#4090CD
oklch(63.1% 0.121 244.5)
-
Step 600
600 (this color)
#2180C2
oklch(57.9% 0.132 244.8)
-
Step 700
700
#0165A1
oklch(49% 0.123 245.2)
-
Step 800
800
#0B5382
oklch(42.7% 0.101 244.7)
-
Step 900
900
#154568
oklch(37.7% 0.079 244.5)
-
Step 950
950
#0E293D
oklch(27.1% 0.05 243.6)
#2180C2 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) | #6182C5 | 0.055 |
| Deuteranopia (no green cones) | #4A74C1 | 0.040 |
| Tritanopia (no blue cones) | #009098 | 0.091 |
| Achromatopsia (no color) | #7B7B7B | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2180C2
#2180C2
oklch(57.9% 0.132 244.8)
- #AE6700
#AE6700
oklch(58% 0.13 64.8)
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 #2180C2, 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 0.023
- Nice Blue #107AB0 ΔE 0.032
- Steel Blue #4682B4 ΔE 0.034
- Cool Blue #4984B8 ΔE 0.035
- Blue NCS #118AB2 ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.048
- Off Blue #5684AE ΔE 0.053
Use #2180C2 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.