#2181AA
Closest named color: Blue NCS (#118AB2). oklch(56.9% 0.105 232), rgb(33, 129, 170).
Aa
Black text reads best on this color (4.78:1).
About this color
#2181AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.105 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.026 away. Black text reads best on it, at 4.78:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 4.78:1 |
| White text | 4.38:1 |
Values
| HEX | #2181AA |
| RGB | rgb(33, 129, 170) |
| HSL | hsl(198, 67%, 40%) |
| OKLCH | oklch(56.9% 0.105 232) |
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 #2181AA | 4.38:1 | AA large text | Lc -75.5 | Fine for body text |
| Black text on #2181AA | 4.78:1 | AA | Lc 34.1 | Non-text elements, placeholder text |
| #2181AA text on white | 4.38:1 | AA large text | Lc 70.0 | Content text, not long reading |
| #2181AA text on black | 4.78:1 | AA | Lc -31.6 | 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
#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
#A3C7DA
oklch(81% 0.047 231.1)
-
Step 400
400
#6FA9C8
oklch(70.6% 0.076 232.7)
-
Step 500
500
#4394BA
oklch(63.2% 0.097 231.5)
-
Step 600
600 (this color)
#2181AA
oklch(56.9% 0.105 232)
-
Step 700
700
#08698E
oklch(49% 0.098 232.2)
-
Step 800
800
#0F5674
oklch(42.7% 0.082 232.5)
-
Step 900
900
#17475D
oklch(37.6% 0.063 231.9)
-
Step 950
950
#0F2A37
oklch(27.1% 0.041 231.9)
#2181AA 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) | #6C80AC | 0.069 |
| Deuteranopia (no green cones) | #5A73A9 | 0.058 |
| Tritanopia (no blue cones) | #008C8F | 0.062 |
| Achromatopsia (no color) | #787878 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2181AA
#2181AA
oklch(56.9% 0.105 232)
- #A76438
#A76438
oklch(56.9% 0.105 52.4)
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 #2181AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.026
- Nice Blue #107AB0 ΔE 0.026
- Cerulean #457B9D ΔE 0.030
- Teal Blue #01889F ΔE 0.032
- Steel Blue #4682B4 ΔE 0.032
- Stormy Blue #507B9C ΔE 0.039
- Cool Blue #4984B8 ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.041
Use #2181AA 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.