#2180BE
Closest named color: Windows Blue (#3778BF). oklch(57.7% 0.127 243.2), rgb(33, 128, 190).
Aa
Black text reads best on this color (4.89:1).
About this color
#2180BE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.127 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.024 away. Black text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.89:1 |
| White text | 4.28:1 |
Values
| HEX | #2180BE |
| RGB | rgb(33, 128, 190) |
| HSL | hsl(204, 70%, 44%) |
| OKLCH | oklch(57.7% 0.127 243.2) |
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 #2180BE | 4.28:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #2180BE | 4.89:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #2180BE text on white | 4.28:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #2180BE text on black | 4.89:1 | AA | Lc -32.4 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C8DCED
oklch(88.5% 0.032 243.7)
-
Step 300
300
#A1C6E3
oklch(80.9% 0.057 242)
-
Step 400
400
#6CA7D5
oklch(70.6% 0.091 243.1)
-
Step 500
500
#4191CA
oklch(63.2% 0.116 242.7)
-
Step 600
600 (this color)
#2180BE
oklch(57.7% 0.127 243.2)
-
Step 700
700
#03669E
oklch(49.1% 0.119 243.4)
-
Step 800
800
#0C5480
oklch(42.8% 0.098 242.8)
-
Step 900
900
#164567
oklch(37.6% 0.077 244.1)
-
Step 950
950
#0F293C
oklch(27.1% 0.048 243)
#2180BE 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) | #6382C1 | 0.058 |
| Deuteranopia (no green cones) | #4D74BD | 0.043 |
| Tritanopia (no blue cones) | #008F96 | 0.087 |
| Achromatopsia (no color) | #7A7A7A | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2180BE
#2180BE
oklch(57.7% 0.127 243.2)
- #AD660E
#AD660E
oklch(57.7% 0.127 63.1)
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 #2180BE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.024
- Water Blue #0E87CC ΔE 0.026
- Nice Blue #107AB0 ΔE 0.028
- Steel Blue #4682B4 ΔE 0.030
- Cool Blue #4984B8 ΔE 0.033
- Blue NCS #118AB2 ΔE 0.038
- Flat Blue #3C73A8 ΔE 0.045
- Off Blue #5684AE ΔE 0.050
Use #2180BE 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.