#2187CE
Closest named color: Water Blue (#0E87CC). oklch(60.2% 0.14 245.1), rgb(33, 135, 206).
Aa
Black text reads best on this color (5.42:1).
About this color
#2187CE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.140 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.007 away. Black text reads best on it, at 5.42:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.42:1 |
| White text | 3.87:1 |
Values
| HEX | #2187CE |
| RGB | rgb(33, 135, 206) |
| HSL | hsl(205, 72%, 47%) |
| OKLCH | oklch(60.2% 0.14 245.1) |
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 #2187CE | 3.87:1 | AA large text | Lc -71.2 | Content text, not long reading |
| Black text on #2187CE | 5.42:1 | AA | Lc 38.4 | Non-text elements, placeholder text |
| #2187CE text on white | 3.87:1 | AA large text | Lc 65.7 | Content text, not long reading |
| #2187CE 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
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C5DCF1
oklch(88.4% 0.038 245.8)
-
Step 300
300
#9CC6EA
oklch(80.9% 0.068 244.6)
-
Step 400
400
#62A7E0
oklch(70.6% 0.109 245.1)
-
Step 500
500 (this color)
#2187CE
oklch(60.2% 0.14 245.1)
-
Step 600
600
#0079BF
oklch(55.7% 0.14 245)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#005385
oklch(42.7% 0.107 244.8)
-
Step 900
900
#06456E
oklch(37.7% 0.091 244.8)
-
Step 950
950
#092941
oklch(27.2% 0.058 245.2)
#2187CE 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) | #658AD1 | 0.057 |
| Deuteranopia (no green cones) | #4D7BCD | 0.041 |
| Tritanopia (no blue cones) | #0098A1 | 0.096 |
| Achromatopsia (no color) | #818181 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2187CE
#2187CE
oklch(60.2% 0.14 245.1)
- #B76D00
#B76D00
oklch(60.3% 0.135 65)
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 #2187CE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.007
- Cool Blue #4984B8 ΔE 0.039
- Steel Blue #4682B4 ΔE 0.043
- Windows Blue #3778BF ΔE 0.043
- Dark Sky Blue #448EE4 ΔE 0.045
- Blue NCS #118AB2 ΔE 0.047
- Nice Blue #107AB0 ΔE 0.056
- Off Blue #5684AE ΔE 0.058
Use #2187CE 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.