#218DC9
Closest named color: Water Blue (#0E87CC). oklch(61.4% 0.129 239.5), rgb(33, 141, 201).
Aa
Black text reads best on this color (5.71:1).
About this color
#218DC9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.129 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.021 away. Black text reads best on it, at 5.71:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.71:1 |
| White text | 3.67:1 |
Values
| HEX | #218DC9 |
| RGB | rgb(33, 141, 201) |
| HSL | hsl(201, 72%, 46%) |
| OKLCH | oklch(61.4% 0.129 239.5) |
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 #218DC9 | 3.67:1 | AA large text | Lc -69.3 | Content text, not long reading |
| Black text on #218DC9 | 5.71:1 | AA | Lc 40.2 | Non-text elements, placeholder text |
| #218DC9 text on white | 3.67:1 | AA large text | Lc 63.9 | Content text, not long reading |
| #218DC9 text on black | 5.71:1 | AA | Lc -37.8 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C5DDEE
oklch(88.5% 0.035 238.7)
-
Step 300
300
#9CC7E6
oklch(81% 0.063 239.9)
-
Step 400
400
#61A9D9
oklch(70.7% 0.101 239.5)
-
Step 500
500 (this color)
#218DC9
oklch(61.4% 0.129 239.5)
-
Step 600
600
#007BB5
oklch(55.6% 0.127 239.8)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
Step 800
800
#00557E
oklch(42.8% 0.097 239.2)
-
Step 900
900
#034669
oklch(37.6% 0.084 239.9)
-
Step 950
950
#08293E
oklch(26.9% 0.054 241.2)
#218DC9 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) | #708ECC | 0.067 |
| Deuteranopia (no green cones) | #5A7FC8 | 0.052 |
| Tritanopia (no blue cones) | #009CA2 | 0.085 |
| Achromatopsia (no color) | #858585 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218DC9
#218DC9
oklch(61.4% 0.129 239.5)
- #BC6F24
#BC6F24
oklch(61.5% 0.129 59.7)
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 #218DC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.021
- Cool Blue #4984B8 ΔE 0.036
- Blue NCS #118AB2 ΔE 0.036
- Steel Blue #4682B4 ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.048
- Off Blue #5684AE ΔE 0.052
- Dusty Blue #5A86AD ΔE 0.054
- Faded Blue #658CBB ΔE 0.055
Use #218DC9 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.