#2180A3
Closest named color: Cerulean (#457B9D). oklch(56.3% 0.099 228.1), rgb(33, 128, 163).
Aa
Black text reads best on this color (4.68:1).
About this color
#2180A3 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 56%, its chroma 0.099 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.026 away. Black text reads best on it, at 4.68:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #2180A3 |
| RGB | rgb(33, 128, 163) |
| HSL | hsl(196, 66%, 38%) |
| OKLCH | oklch(56.3% 0.099 228.1) |
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 #2180A3 | 4.48:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #2180A3 | 4.68:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #2180A3 text on white | 4.48:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #2180A3 text on black | 4.68:1 | AA | Lc -30.9 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C9DDE6
oklch(88.5% 0.025 226.5)
-
Step 300
300
#A3C7D8
oklch(80.9% 0.045 228.2)
-
Step 400
400
#70AAC4
oklch(70.8% 0.071 228)
-
Step 500
500
#4594B5
oklch(63.1% 0.092 228.2)
-
Step 600
600 (this color)
#2180A3
oklch(56.3% 0.099 228.1)
-
Step 700
700
#0C6A8A
oklch(49.1% 0.093 228.4)
-
Step 800
800
#115770
oklch(42.8% 0.077 227.7)
-
Step 900
900
#18485A
oklch(37.8% 0.059 226.5)
-
Step 950
950
#102A35
oklch(27% 0.038 228.2)
#2180A3 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) | #6E7EA5 | 0.072 |
| Deuteranopia (no green cones) | #5C72A3 | 0.061 |
| Tritanopia (no blue cones) | #008A8C | 0.055 |
| Achromatopsia (no color) | #777777 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2180A3
#2180A3
oklch(56.3% 0.099 228.1)
- #A4623F
#A4623F
oklch(56.3% 0.099 47.9)
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 #2180A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.026
- Teal Blue #01889F ΔE 0.027
- Nice Blue #107AB0 ΔE 0.031
- Ocean #017B92 ΔE 0.032
- Blue NCS #118AB2 ΔE 0.032
- Stormy Blue #507B9C ΔE 0.036
- Dull Blue #49759C ΔE 0.039
- Steel Blue #4682B4 ΔE 0.040
Use #2180A3 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.