#218BB9
Closest named color: Blue NCS (#118AB2). oklch(60.1% 0.114 232.8), rgb(33, 139, 185).
Aa
Black text reads best on this color (5.45:1).
About this color
#218BB9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.114 and its hue 233°. 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 5.45:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.45:1 |
| White text | 3.84:1 |
Values
| HEX | #218BB9 |
| RGB | rgb(33, 139, 185) |
| HSL | hsl(198, 70%, 43%) |
| OKLCH | oklch(60.1% 0.114 232.8) |
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 #218BB9 | 3.84:1 | AA large text | Lc -71.0 | Content text, not long reading |
| Black text on #218BB9 | 5.45:1 | AA | Lc 38.5 | Non-text elements, placeholder text |
| #218BB9 text on white | 3.84:1 | AA large text | Lc 65.5 | Content text, not long reading |
| #218BB9 text on black | 5.45:1 | AA | Lc -36.1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C6DDEB
oklch(88.5% 0.031 234.5)
-
Step 300
300
#9DC8DF
oklch(81% 0.056 231.7)
-
Step 400
400
#64AACF
oklch(70.6% 0.089 233.1)
-
Step 500
500 (this color)
#218BB9
oklch(60.1% 0.114 232.8)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#074862
oklch(37.8% 0.074 232)
-
Step 950
950
#092A3A
oklch(27% 0.048 233.8)
#218BB9 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) | #748ABB | 0.073 |
| Deuteranopia (no green cones) | #607CB8 | 0.061 |
| Tritanopia (no blue cones) | #00979B | 0.067 |
| Achromatopsia (no color) | #828282 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218BB9
#218BB9
oklch(60.1% 0.114 232.8)
- #B56B39
#B56B39
oklch(60% 0.115 52.7)
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 #218BB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.013
- Cool Blue #4984B8 ΔE 0.030
- Steel Blue #4682B4 ΔE 0.031
- Water Blue #0E87CC ΔE 0.034
- Off Blue #5684AE ΔE 0.040
- Teal Blue #01889F ΔE 0.042
- Dusty Blue #5A86AD ΔE 0.043
- Nice Blue #107AB0 ΔE 0.051
Use #218BB9 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.