#2187C5
Closest named color: Water Blue (#0E87CC). oklch(59.7% 0.129 241.7), rgb(33, 135, 197).
Aa
Black text reads best on this color (5.33:1).
About this color
#2187C5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.129 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.012 away. Black text reads best on it, at 5.33:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.33:1 |
| White text | 3.93:1 |
Values
| HEX | #2187C5 |
| RGB | rgb(33, 135, 197) |
| HSL | hsl(203, 71%, 45%) |
| OKLCH | oklch(59.7% 0.129 241.7) |
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 #2187C5 | 3.93:1 | AA large text | Lc -71.8 | Content text, not long reading |
| Black text on #2187C5 | 5.33:1 | AA | Lc 37.8 | Non-text elements, placeholder text |
| #2187C5 text on white | 3.93:1 | AA large text | Lc 66.3 | Content text, not long reading |
| #2187C5 text on black | 5.33:1 | AA | Lc -35.4 | 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
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C6DDEF
oklch(88.6% 0.035 241.5)
-
Step 300
300
#9DC6E6
oklch(80.8% 0.063 242)
-
Step 400
400
#64A8DA
oklch(70.6% 0.101 242)
-
Step 500
500 (this color)
#2187C5
oklch(59.7% 0.129 241.7)
-
Step 600
600
#007AB8
oklch(55.5% 0.131 241.7)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#08466A
oklch(37.7% 0.084 241.6)
-
Step 950
950
#09293E
oklch(27% 0.054 241.8)
#2187C5 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) | #6A88C8 | 0.062 |
| Deuteranopia (no green cones) | #537AC4 | 0.047 |
| Tritanopia (no blue cones) | #00969D | 0.086 |
| Achromatopsia (no color) | #808080 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2187C5
#2187C5
oklch(59.7% 0.129 241.7)
- #B56B19
#B56B19
oklch(59.8% 0.129 61.8)
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 #2187C5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.012
- Cool Blue #4984B8 ΔE 0.030
- Steel Blue #4682B4 ΔE 0.032
- Blue NCS #118AB2 ΔE 0.034
- Windows Blue #3778BF ΔE 0.041
- Nice Blue #107AB0 ΔE 0.047
- Off Blue #5684AE ΔE 0.048
- Dusty Blue #5A86AD ΔE 0.053
Use #2187C5 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.