#2187BE
Closest named color: Water Blue (#0E87CC). oklch(59.3% 0.122 238.5), rgb(33, 135, 190).
Aa
Black text reads best on this color (5.27:1).
About this color
#2187BE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.122 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.022 away. Black text reads best on it, at 5.27:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.27:1 |
| White text | 3.98:1 |
Values
| HEX | #2187BE |
| RGB | rgb(33, 135, 190) |
| HSL | hsl(201, 70%, 44%) |
| OKLCH | oklch(59.3% 0.122 238.5) |
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 #2187BE | 3.98:1 | AA large text | Lc -72.2 | Content text, not long reading |
| Black text on #2187BE | 5.27:1 | AA | Lc 37.4 | Non-text elements, placeholder text |
| #2187BE text on white | 3.98:1 | AA large text | Lc 66.7 | Content text, not long reading |
| #2187BE text on black | 5.27:1 | AA | Lc -34.9 | 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 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
#C8DDEB
oklch(88.6% 0.03 236.9)
-
Step 300
300
#A1C6E0
oklch(80.8% 0.054 239)
-
Step 400
400
#6BA9D1
oklch(70.8% 0.087 238)
-
Step 500
500
#3D92C5
oklch(63.1% 0.112 238.6)
-
Step 600
600 (this color)
#2187BE
oklch(59.3% 0.122 238.5)
-
Step 700
700
#006897
oklch(49.1% 0.109 238.1)
-
Step 800
800
#04557C
oklch(42.7% 0.094 238.4)
-
Step 900
900
#134664
oklch(37.6% 0.073 239.3)
-
Step 950
950
#0D293A
oklch(26.9% 0.046 238.6)
#2187BE 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) | #6D87C0 | 0.066 |
| Deuteranopia (no green cones) | #5879BD | 0.053 |
| Tritanopia (no blue cones) | #00959A | 0.079 |
| Achromatopsia (no color) | #7F7F7F | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2187BE
#2187BE
oklch(59.3% 0.122 238.5)
- #B36A28
#B36A28
oklch(59.4% 0.122 58.6)
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 #2187BE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.022
- Blue NCS #118AB2 ΔE 0.024
- Cool Blue #4984B8 ΔE 0.026
- Steel Blue #4682B4 ΔE 0.027
- Nice Blue #107AB0 ΔE 0.042
- Off Blue #5684AE ΔE 0.043
- Windows Blue #3778BF ΔE 0.043
- Dusty Blue #5A86AD ΔE 0.048
Use #2187BE 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.