#218CDA
Closest named color: Water Blue (#0E87CC). oklch(62.1% 0.149 246.5), rgb(33, 140, 218).
Aa
Black text reads best on this color (5.82:1).
About this color
#218CDA is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.149 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.026 away. Black text reads best on it, at 5.82:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.82:1 |
| White text | 3.60:1 |
Values
| HEX | #218CDA |
| RGB | rgb(33, 140, 218) |
| HSL | hsl(205, 74%, 49%) |
| OKLCH | oklch(62.1% 0.149 246.5) |
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 #218CDA | 3.60:1 | AA large text | Lc -68.6 | Content text, not long reading |
| Black text on #218CDA | 5.82:1 | AA | Lc 41.0 | Non-text elements, placeholder text |
| #218CDA text on white | 3.60:1 | AA large text | Lc 63.1 | Content text, not long reading |
| #218CDA text on black | 5.82:1 | AA | Lc -38.6 | 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 500.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C4DCF3
oklch(88.4% 0.041 247.1)
-
Step 300
300
#9AC6EE
oklch(80.9% 0.074 246.3)
-
Step 400
400
#5FA7E5
oklch(70.7% 0.117 246.4)
-
Step 500
500 (this color)
#218CDA
oklch(62.1% 0.149 246.5)
-
Step 600
600
#0078C2
oklch(55.6% 0.145 246.5)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800
#005287
oklch(42.6% 0.111 246.5)
-
Step 900
900
#014472
oklch(37.6% 0.098 247)
-
Step 950
950
#072842
oklch(26.9% 0.061 246.8)
#218CDA 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) | #6790DD | 0.058 |
| Deuteranopia (no green cones) | #4C7FD9 | 0.041 |
| Tritanopia (no blue cones) | #009FA9 | 0.105 |
| Achromatopsia (no color) | #878787 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218CDA
#218CDA
oklch(62.1% 0.149 246.5)
- #BD7300
#BD7300
oklch(62.2% 0.138 66.5)
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 #218CDA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.026
- Dark Sky Blue #448EE4 ΔE 0.028
- Chefchaouen Blue #4895EF ΔE 0.048
- Cool Blue #4984B8 ΔE 0.054
- Dodger Blue #1E90FF ΔE 0.055
- Soft Blue #6488EA ΔE 0.059
- Steel Blue #4682B4 ΔE 0.060
- Windows Blue #3778BF ΔE 0.061
Use #218CDA 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.