#218DCD
Closest named color: Water Blue (#0E87CC). oklch(61.6% 0.133 241.3), rgb(33, 141, 205).
Aa
Black text reads best on this color (5.75:1).
About this color
#218DCD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.133 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.019 away. Black text reads best on it, at 5.75:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.75:1 |
| White text | 3.64:1 |
Values
| HEX | #218DCD |
| RGB | rgb(33, 141, 205) |
| HSL | hsl(202, 72%, 47%) |
| OKLCH | oklch(61.6% 0.133 241.3) |
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 #218DCD | 3.64:1 | AA large text | Lc -69.1 | Content text, not long reading |
| Black text on #218DCD | 5.75:1 | AA | Lc 40.5 | Non-text elements, placeholder text |
| #218DCD text on white | 3.64:1 | AA large text | Lc 63.6 | Content text, not long reading |
| #218DCD text on black | 5.75:1 | AA | Lc -38.1 | 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
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C5DDEF
oklch(88.5% 0.036 240.3)
-
Step 300
300
#9BC7E7
oklch(80.9% 0.065 240.2)
-
Step 400
400
#61A9DC
oklch(70.8% 0.104 241.2)
-
Step 500
500 (this color)
#218DCD
oklch(61.6% 0.133 241.3)
-
Step 600
600
#007BB8
oklch(55.7% 0.13 241.1)
-
Step 700
700
#00679B
oklch(49.1% 0.115 241)
-
Step 800
800
#005480
oklch(42.6% 0.1 241.3)
-
Step 900
900
#02466B
oklch(37.7% 0.087 241.2)
-
Step 950
950
#07293F
oklch(26.9% 0.056 241.9)
#218DCD 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) | #6F8ED0 | 0.065 |
| Deuteranopia (no green cones) | #577FCC | 0.050 |
| Tritanopia (no blue cones) | #009DA4 | 0.089 |
| Achromatopsia (no color) | #868686 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218DCD
#218DCD
oklch(61.6% 0.133 241.3)
- #BD6F1B
#BD6F1B
oklch(61.5% 0.133 61.1)
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 #218DCD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.019
- Cool Blue #4984B8 ΔE 0.040
- Blue NCS #118AB2 ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.043
- Steel Blue #4682B4 ΔE 0.045
- Off Blue #5684AE ΔE 0.056
- Faded Blue #658CBB ΔE 0.057
- Windows Blue #3778BF ΔE 0.057
Use #218DCD 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.