#2183CD
Closest named color: Water Blue (#0E87CC). oklch(59.2% 0.142 247), rgb(33, 131, 205).
Aa
Black text reads best on this color (5.19:1).
About this color
#2183CD is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.142 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.012 away. Black text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.19:1 |
| White text | 4.04:1 |
Values
| HEX | #2183CD |
| RGB | rgb(33, 131, 205) |
| HSL | hsl(206, 72%, 47%) |
| OKLCH | oklch(59.2% 0.142 247) |
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 #2183CD | 4.04:1 | AA large text | Lc -72.7 | Content text, not long reading |
| Black text on #2183CD | 5.19:1 | AA | Lc 36.9 | Non-text elements, placeholder text |
| #2183CD text on white | 4.04:1 | AA large text | Lc 67.2 | Content text, not long reading |
| #2183CD text on black | 5.19:1 | AA | Lc -34.5 | 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 600.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF6
oklch(93.5% 0.019 248)
-
Step 200
200
#C7DCF0
oklch(88.5% 0.036 246.9)
-
Step 300
300
#A0C5E8
oklch(80.9% 0.064 247.2)
-
Step 400
400
#6AA6DD
oklch(70.6% 0.102 247.4)
-
Step 500
500
#3C8FD4
oklch(63.1% 0.131 247)
-
Step 600
600 (this color)
#2183CD
oklch(59.2% 0.142 247)
-
Step 700
700
#0064A5
oklch(49% 0.13 247.2)
-
Step 800
800
#055287
oklch(42.7% 0.11 247.1)
-
Step 900
900
#13446C
oklch(37.6% 0.086 247.6)
-
Step 950
950
#0D283F
oklch(26.9% 0.054 247.3)
#2183CD 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) | #6087D0 | 0.054 |
| Deuteranopia (no green cones) | #4677CC | 0.037 |
| Tritanopia (no blue cones) | #00959E | 0.101 |
| Achromatopsia (no color) | #7E7E7E | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2183CD
#2183CD
oklch(59.2% 0.142 247)
- #B16C00
#B16C00
oklch(59.3% 0.131 67)
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 #2183CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.012
- Windows Blue #3778BF ΔE 0.034
- Cool Blue #4984B8 ΔE 0.041
- Steel Blue #4682B4 ΔE 0.043
- Nice Blue #107AB0 ΔE 0.050
- Blue NCS #118AB2 ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.052
- Off Blue #5684AE ΔE 0.060
Use #2183CD 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.