#218AAA
Closest named color: Blue NCS (#118AB2). oklch(59.1% 0.102 223.8), rgb(33, 138, 170).
Aa
Black text reads best on this color (5.28:1).
About this color
#218AAA is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.102 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.013 away. Black text reads best on it, at 5.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.28:1 |
| White text | 3.97:1 |
Values
| HEX | #218AAA |
| RGB | rgb(33, 138, 170) |
| HSL | hsl(194, 67%, 40%) |
| OKLCH | oklch(59.1% 0.102 223.8) |
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 #218AAA | 3.97:1 | AA large text | Lc -72.2 | Content text, not long reading |
| Black text on #218AAA | 5.28:1 | AA | Lc 37.4 | Non-text elements, placeholder text |
| #218AAA text on white | 3.97:1 | AA large text | Lc 66.7 | Content text, not long reading |
| #218AAA text on black | 5.28:1 | AA | Lc -35.0 | 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
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C8DDE6
oklch(88.5% 0.026 225.3)
-
Step 300
300
#A1C8D7
oklch(81% 0.046 223.3)
-
Step 400
400
#6CABC2
oklch(70.7% 0.073 223.2)
-
Step 500
500
#3E96B3
oklch(63.2% 0.093 223.1)
-
Step 600
600 (this color)
#218AAA
oklch(59.1% 0.102 223.8)
-
Step 700
700
#006B87
oklch(49% 0.092 224)
-
Step 800
800
#05586E
oklch(42.8% 0.078 222.8)
-
Step 900
900
#134859
oklch(37.6% 0.061 223.7)
-
Step 950
950
#0E2A34
oklch(26.9% 0.038 224.5)
#218AAA 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) | #7887AC | 0.080 |
| Deuteranopia (no green cones) | #667AAA | 0.070 |
| Tritanopia (no blue cones) | #009494 | 0.053 |
| Achromatopsia (no color) | #7F7F7F | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218AAA
#218AAA
oklch(59.1% 0.102 223.8)
- #B0684A
#B0684A
oklch(59.1% 0.102 43.1)
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 #218AAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.013
- Teal Blue #01889F ΔE 0.021
- Steel Blue #4682B4 ΔE 0.039
- Cool Blue #4984B8 ΔE 0.041
- Off Blue #5684AE ΔE 0.043
- Dusty Blue #5A86AD ΔE 0.044
- Cerulean #457B9D ΔE 0.045
- Teal Green #0A9396 ΔE 0.048
Use #218AAA 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.