#2183B8
Closest named color: Steel Blue (#4682B4). oklch(58.1% 0.118 238.4), rgb(33, 131, 184).
Aa
Black text reads best on this color (5.00:1).
About this color
#2183B8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.118 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.024 away. Black text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 5.00:1 |
| White text | 4.19:1 |
Values
| HEX | #2183B8 |
| RGB | rgb(33, 131, 184) |
| HSL | hsl(201, 70%, 43%) |
| OKLCH | oklch(58.1% 0.118 238.4) |
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 #2183B8 | 4.19:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #2183B8 | 5.00:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #2183B8 text on white | 4.19:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #2183B8 text on black | 5.00:1 | AA | Lc -33.1 | 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 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
#C8DCEB
oklch(88.4% 0.03 240.2)
-
Step 300
300
#A1C6E0
oklch(80.8% 0.054 239)
-
Step 400
400
#6CA8D0
oklch(70.6% 0.086 238.8)
-
Step 500
500
#4092C4
oklch(63.1% 0.109 238.7)
-
Step 600
600 (this color)
#2183B8
oklch(58.1% 0.118 238.4)
-
Step 700
700
#006897
oklch(49.1% 0.109 238.1)
-
Step 800
800
#0A557B
oklch(42.8% 0.091 238.4)
-
Step 900
900
#154663
oklch(37.6% 0.071 239.1)
-
Step 950
950
#0E293A
oklch(26.9% 0.046 239.3)
#2183B8 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) | #6A83BA | 0.064 |
| Deuteranopia (no green cones) | #5576B7 | 0.050 |
| Tritanopia (no blue cones) | #009095 | 0.076 |
| Achromatopsia (no color) | #7C7C7C | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2183B8
#2183B8
oklch(58.1% 0.118 238.4)
- #AD6728
#AD6728
oklch(58.1% 0.118 58.7)
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 #2183B8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.024
- Blue NCS #118AB2 ΔE 0.025
- Cool Blue #4984B8 ΔE 0.028
- Nice Blue #107AB0 ΔE 0.029
- Water Blue #0E87CC ΔE 0.030
- Windows Blue #3778BF ΔE 0.036
- Off Blue #5684AE ΔE 0.043
- Cerulean #457B9D ΔE 0.045
Use #2183B8 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.