#218AB5
Closest named color: Blue NCS (#118AB2). oklch(59.6% 0.111 231.3), rgb(33, 138, 181).
Aa
Black text reads best on this color (5.36:1).
About this color
#218AB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.111 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.008 away. Black text reads best on it, at 5.36:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.36:1 |
| White text | 3.91:1 |
Values
| HEX | #218AB5 |
| RGB | rgb(33, 138, 181) |
| HSL | hsl(197, 69%, 42%) |
| OKLCH | oklch(59.6% 0.111 231.3) |
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 #218AB5 | 3.91:1 | AA large text | Lc -71.6 | Content text, not long reading |
| Black text on #218AB5 | 5.36:1 | AA | Lc 38.0 | Non-text elements, placeholder text |
| #218AB5 text on white | 3.91:1 | AA large text | Lc 66.1 | Content text, not long reading |
| #218AB5 text on black | 5.36:1 | AA | Lc -35.5 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C6DDEA
oklch(88.4% 0.03 232.5)
-
Step 300
300
#9EC8DE
oklch(81% 0.054 231.1)
-
Step 400
400
#65ABCD
oklch(70.8% 0.086 230.8)
-
Step 500
500 (this color)
#218AB5
oklch(59.6% 0.111 231.3)
-
Step 600
600
#007EA9
oklch(55.6% 0.112 231.2)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#084861
oklch(37.8% 0.072 231.1)
-
Step 950
950
#092A39
oklch(26.9% 0.046 232.1)
#218AB5 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) | #7488B7 | 0.074 |
| Deuteranopia (no green cones) | #617BB4 | 0.062 |
| Tritanopia (no blue cones) | #009698 | 0.066 |
| Achromatopsia (no color) | #818181 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218AB5
#218AB5
oklch(59.6% 0.111 231.3)
- #B36A3D
#B36A3D
oklch(59.6% 0.111 50.9)
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 #218AB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.008
- Steel Blue #4682B4 ΔE 0.030
- Cool Blue #4984B8 ΔE 0.031
- Teal Blue #01889F ΔE 0.036
- Water Blue #0E87CC ΔE 0.039
- Off Blue #5684AE ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.042
- Nice Blue #107AB0 ΔE 0.048
Use #218AB5 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.