#2181C8
Closest named color: Water Blue (#0E87CC). oklch(58.5% 0.138 246.4), rgb(33, 129, 200).
Aa
Black text reads best on this color (5.03:1).
About this color
#2181C8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.138 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.016 away. Black text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.03:1 |
| White text | 4.16:1 |
Values
| HEX | #2181C8 |
| RGB | rgb(33, 129, 200) |
| HSL | hsl(206, 72%, 46%) |
| OKLCH | oklch(58.5% 0.138 246.4) |
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 #2181C8 | 4.16:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #2181C8 | 5.03:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #2181C8 text on white | 4.16:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #2181C8 text on black | 5.03:1 | AA | Lc -33.4 | 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 600.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C7DCEF
oklch(88.5% 0.035 245.5)
-
Step 300
300
#A0C5E7
oklch(80.8% 0.062 246.4)
-
Step 400
400
#6BA7DB
oklch(70.8% 0.099 245.9)
-
Step 500
500
#3E8FD1
oklch(63% 0.127 246.4)
-
Step 600
600 (this color)
#2181C8
oklch(58.5% 0.138 246.4)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800
#095285
oklch(42.6% 0.106 246.7)
-
Step 900
900
#14456B
oklch(37.8% 0.083 246.2)
-
Step 950
950
#0E283E
oklch(26.9% 0.052 246.9)
#2181C8 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) | #5F84CB | 0.053 |
| Deuteranopia (no green cones) | #4775C7 | 0.038 |
| Tritanopia (no blue cones) | #00929B | 0.097 |
| Achromatopsia (no color) | #7C7C7C | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2181C8
#2181C8
oklch(58.5% 0.138 246.4)
- #AE6900
#AE6900
oklch(58.4% 0.13 66.2)
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 #2181C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.016
- Windows Blue #3778BF ΔE 0.027
- Cool Blue #4984B8 ΔE 0.039
- Steel Blue #4682B4 ΔE 0.039
- Nice Blue #107AB0 ΔE 0.041
- Blue NCS #118AB2 ΔE 0.048
- Flat Blue #3C73A8 ΔE 0.056
- Off Blue #5684AE ΔE 0.057
Use #2181C8 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.