#2180BC
Closest named color: Nice Blue (#107AB0). oklch(57.6% 0.125 242.4), rgb(33, 128, 188).
Aa
Black text reads best on this color (4.87:1).
About this color
#2180BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.125 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.025 away. Black text reads best on it, at 4.87:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.87:1 |
| White text | 4.30:1 |
Values
| HEX | #2180BC |
| RGB | rgb(33, 128, 188) |
| HSL | hsl(203, 70%, 43%) |
| OKLCH | oklch(57.6% 0.125 242.4) |
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 #2180BC | 4.30:1 | AA large text | Lc -74.8 | Content text, not long reading |
| Black text on #2180BC | 4.87:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #2180BC text on white | 4.30:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #2180BC text on black | 4.87:1 | AA | Lc -32.3 | 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
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C8DCEC
oklch(88.4% 0.031 242)
-
Step 300
300
#A2C6E2
oklch(81% 0.055 241.8)
-
Step 400
400
#6DA7D4
oklch(70.6% 0.09 242.9)
-
Step 500
500
#4191C9
oklch(63.2% 0.115 242.3)
-
Step 600
600 (this color)
#2180BC
oklch(57.6% 0.125 242.4)
-
Step 700
700
#03669C
oklch(49% 0.116 242.5)
-
Step 800
800
#0D547F
oklch(42.8% 0.096 242.4)
-
Step 900
900
#164666
oklch(37.8% 0.075 242)
-
Step 950
950
#0F293C
oklch(27.1% 0.048 243)
#2180BC 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) | #6481BF | 0.059 |
| Deuteranopia (no green cones) | #4E74BB | 0.043 |
| Tritanopia (no blue cones) | #008F95 | 0.086 |
| Achromatopsia (no color) | #7A7A7A | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2180BC
#2180BC
oklch(57.6% 0.125 242.4)
- #AC6615
#AC6615
oklch(57.6% 0.125 62.6)
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 #2180BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.025
- Windows Blue #3778BF ΔE 0.026
- Water Blue #0E87CC ΔE 0.028
- Steel Blue #4682B4 ΔE 0.029
- Cool Blue #4984B8 ΔE 0.033
- Blue NCS #118AB2 ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.043
- Off Blue #5684AE ΔE 0.049
Use #2180BC 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.