#2188C8
Closest named color: Water Blue (#0E87CC). oklch(60.1% 0.132 242.3), rgb(33, 136, 200).
Aa
Black text reads best on this color (5.42:1).
About this color
#2188C8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.132 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.009 away. Black text reads best on it, at 5.42:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.42:1 |
| White text | 3.87:1 |
Values
| HEX | #2188C8 |
| RGB | rgb(33, 136, 200) |
| HSL | hsl(203, 72%, 46%) |
| OKLCH | oklch(60.1% 0.132 242.3) |
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 #2188C8 | 3.87:1 | AA large text | Lc -71.2 | Content text, not long reading |
| Black text on #2188C8 | 5.42:1 | AA | Lc 38.3 | Non-text elements, placeholder text |
| #2188C8 text on white | 3.87:1 | AA large text | Lc 65.7 | Content text, not long reading |
| #2188C8 text on black | 5.42:1 | AA | Lc -35.9 | 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 500.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF6
oklch(93.7% 0.019 243)
-
Step 200
200
#C5DDEF
oklch(88.5% 0.036 240.3)
-
Step 300
300
#9DC6E7
oklch(80.8% 0.064 242.9)
-
Step 400
400
#63A8DC
oklch(70.7% 0.104 242.7)
-
Step 500
500 (this color)
#2188C8
oklch(60.1% 0.132 242.3)
-
Step 600
600
#007ABA
oklch(55.6% 0.133 242.5)
-
Step 700
700
#00679D
oklch(49.2% 0.117 242)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#07466B
oklch(37.8% 0.086 242.1)
-
Step 950
950
#09293F
oklch(27% 0.055 243)
#2188C8 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) | #6A8ACB | 0.062 |
| Deuteranopia (no green cones) | #537BC7 | 0.047 |
| Tritanopia (no blue cones) | #00989F | 0.090 |
| Achromatopsia (no color) | #818181 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2188C8
#2188C8
oklch(60.1% 0.132 242.3)
- #B76C14
#B76C14
oklch(60.2% 0.132 62.5)
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 #2188C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.009
- Cool Blue #4984B8 ΔE 0.033
- Steel Blue #4682B4 ΔE 0.036
- Blue NCS #118AB2 ΔE 0.037
- Windows Blue #3778BF ΔE 0.044
- Off Blue #5684AE ΔE 0.051
- Nice Blue #107AB0 ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.051
Use #2188C8 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.