#2180AB
Closest named color: Nice Blue (#107AB0). oklch(56.7% 0.107 233.5), rgb(33, 128, 171).
Aa
Black text reads best on this color (4.74:1).
About this color
#2180AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.107 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.023 away. Black text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.74:1 |
| White text | 4.43:1 |
Values
| HEX | #2180AB |
| RGB | rgb(33, 128, 171) |
| HSL | hsl(199, 68%, 40%) |
| OKLCH | oklch(56.7% 0.107 233.5) |
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 #2180AB | 4.43:1 | AA large text | Lc -75.8 | Fine for body text |
| Black text on #2180AB | 4.74:1 | AA | Lc 33.7 | Non-text elements, placeholder text |
| #2180AB text on white | 4.43:1 | AA large text | Lc 70.3 | Content text, not long reading |
| #2180AB text on black | 4.74:1 | AA | Lc -31.3 | 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 600.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C9DDE8
oklch(88.6% 0.026 231.7)
-
Step 300
300
#A3C7DB
oklch(81% 0.048 232.5)
-
Step 400
400
#6FA9C9
oklch(70.7% 0.076 233.5)
-
Step 500
500
#4493BB
oklch(63.1% 0.098 233.4)
-
Step 600
600 (this color)
#2180AB
oklch(56.7% 0.107 233.5)
-
Step 700
700
#096990
oklch(49.1% 0.1 233.6)
-
Step 800
800
#105675
oklch(42.8% 0.082 233.5)
-
Step 900
900
#17475E
oklch(37.7% 0.064 233.1)
-
Step 950
950
#102A37
oklch(27.1% 0.04 232.6)
#2180AB 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) | #6B7FAD | 0.068 |
| Deuteranopia (no green cones) | #5872AA | 0.056 |
| Tritanopia (no blue cones) | #008B8F | 0.063 |
| Achromatopsia (no color) | #787878 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2180AB
#2180AB
oklch(56.7% 0.107 233.5)
- #A76334
#A76334
oklch(56.7% 0.108 53.3)
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 #2180AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.023
- Blue NCS #118AB2 ΔE 0.028
- Cerulean #457B9D ΔE 0.030
- Steel Blue #4682B4 ΔE 0.032
- Teal Blue #01889F ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.038
- Cool Blue #4984B8 ΔE 0.039
- Stormy Blue #507B9C ΔE 0.039
Use #2180AB 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.