#2183B6
Closest named color: Blue NCS (#118AB2). oklch(58% 0.116 237.4), rgb(33, 131, 182).
Aa
Black text reads best on this color (4.98:1).
About this color
#2183B6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.116 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.023 away. Black text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #2183B6 |
| RGB | rgb(33, 131, 182) |
| HSL | hsl(201, 69%, 42%) |
| OKLCH | oklch(58% 0.116 237.4) |
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 #2183B6 | 4.21:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #2183B6 | 4.98:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #2183B6 text on white | 4.21:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #2183B6 text on black | 4.98:1 | AA | Lc -33.0 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C8DCEA
oklch(88.4% 0.029 238.3)
-
Step 300
300
#A2C6DF
oklch(80.9% 0.052 238.6)
-
Step 400
400
#6DA9CF
oklch(70.8% 0.084 237.4)
-
Step 500
500
#4092C2
oklch(63% 0.107 237.6)
-
Step 600
600 (this color)
#2183B6
oklch(58% 0.116 237.4)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
Step 800
800
#0B557A
oklch(42.7% 0.09 237.8)
-
Step 900
900
#154662
oklch(37.6% 0.07 238.1)
-
Step 950
950
#0E2939
oklch(26.8% 0.044 237.6)
#2183B6 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) | #6A83B8 | 0.065 |
| Deuteranopia (no green cones) | #5775B5 | 0.054 |
| Tritanopia (no blue cones) | #009095 | 0.074 |
| Achromatopsia (no color) | #7B7B7B | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2183B6
#2183B6
oklch(58% 0.116 237.4)
- #AD662B
#AD662B
oklch(57.9% 0.117 56.9)
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 #2183B6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.023
- Steel Blue #4682B4 ΔE 0.024
- Nice Blue #107AB0 ΔE 0.028
- Cool Blue #4984B8 ΔE 0.029
- Water Blue #0E87CC ΔE 0.033
- Windows Blue #3778BF ΔE 0.038
- Off Blue #5684AE ΔE 0.042
- Cerulean #457B9D ΔE 0.043
Use #2183B6 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.