#218ED9
Closest named color: Water Blue (#0E87CC). oklch(62.5% 0.146 245.1), rgb(33, 142, 217).
Aa
Black text reads best on this color (5.93:1).
About this color
#218ED9 is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.146 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.027 away. Black text reads best on it, at 5.93:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.93:1 |
| White text | 3.53:1 |
Values
| HEX | #218ED9 |
| RGB | rgb(33, 142, 217) |
| HSL | hsl(204, 74%, 49%) |
| OKLCH | oklch(62.5% 0.146 245.1) |
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 #218ED9 | 3.53:1 | AA large text | Lc -67.9 | Content text, not long reading |
| Black text on #218ED9 | 5.93:1 | AA | Lc 41.6 | Non-text elements, placeholder text |
| #218ED9 text on white | 3.53:1 | AA large text | Lc 62.5 | Content text, not long reading |
| #218ED9 text on black | 5.93:1 | AA | Lc -39.2 | 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
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C4DDF2
oklch(88.6% 0.039 243.5)
-
Step 300
300
#9AC6EC
oklch(80.8% 0.071 244.9)
-
Step 400
400
#5FA7E3
oklch(70.6% 0.114 245.5)
-
Step 500
500 (this color)
#218ED9
oklch(62.5% 0.146 245.1)
-
Step 600
600
#0079BF
oklch(55.7% 0.14 245)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#005385
oklch(42.7% 0.107 244.8)
-
Step 900
900
#004570
oklch(37.7% 0.095 244.9)
-
Step 950
950
#062942
oklch(27.1% 0.061 244.7)
#218ED9 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) | #6A91DC | 0.059 |
| Deuteranopia (no green cones) | #5081D8 | 0.043 |
| Tritanopia (no blue cones) | #00A0A9 | 0.102 |
| Achromatopsia (no color) | #888888 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218ED9
#218ED9
oklch(62.5% 0.146 245.1)
- #C07300
#C07300
oklch(62.6% 0.14 65.3)
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 #218ED9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.027
- Dark Sky Blue #448EE4 ΔE 0.028
- Chefchaouen Blue #4895EF ΔE 0.046
- Cool Blue #4984B8 ΔE 0.054
- Dodger Blue #1E90FF ΔE 0.057
- Steel Blue #4682B4 ΔE 0.059
- Blue NCS #118AB2 ΔE 0.061
- Soft Blue #6488EA ΔE 0.061
Use #218ED9 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.